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<br />nEPOUT OI~ AN l'XPEDITIO~D-9WN TIlE.
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<br />FISHES..
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<br />llY SPENCER F, BAIRD AND CHARLES qIRA~D. >
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<br />Uellu. GILA, n. and Go.
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<br />'QE:N. CIUR,-Do(ly subli.l:;iliJrlll, compr~~setl; .bacl~!1lOf~pr
<br />less arched, e~pecially in large specimen}3,' Soru.~tlmes,tap~nng
<br />very much posteriorly, with the .pec1unc!e of ,th~, tajtnl~QGr ,
<br />sle'nder; head depressed, proportlr~nallysn)al1;: upper .qu.tll'p~ .
<br />concav~ j snout donguted ~ eyes circular or plhpLlcal j, rn..9~th
<br />of medium size j upper ja:v .generally ovcrlapplllg th~ ~oWe~,
<br />so as to conceal Its dl'.lt !rom above i nO IJilrbels, nor r~dl-
<br />ments of barbels, at tile .anglc fir the mouth j pharyngeal. ~ie~~h
<br />ohlique,'cnmpresscd,dl?posed on .two rows, ,wJth.th~Jr. :~Jp.
<br />slightly hooked; brallclJlal arcbt~s, lour; sen.les v~rYlOg lILSL,?C
<br />according to the regions j slllull l~llll \n~)t lln!mOHted,on;thG
<br />bacl" larger on L!IC lIanb, n.flll (,f . mc~llUm sl;;:e Ol~ the b~ll~
<br />and tail; h\teral Ime well defined, lonnH!g an OP\?Jl eurve pH
<br />the abdomen, and "lJ'night on the tniJ ; cauc1n~ tin fOi1{'ed~r'
<br />ctesentic. . . . '.' .... .. '.. . '
<br />SIN.-Gila, B. and G.; l)r,oc., Acad. N~l. Sc'"Phila., VI, 1853, ~G8>
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<br />L GIL,~ lloBU6TA,. n. a)1<1 G. rishes, 1/1. l.
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<br />SrEc. cIIAli.~Dody vory stout o:nleriorly, tapering su~denly Lo lhM La,i);;J:Ye.>
<br />near Lhe upper nlarginof lh~ hClld;' scales sub-elliptical. ': .".' '. '.
<br />SIN.-GillI robusta, B; and G., Pl'oc. I\cad. !"ii4. 'Sci., Phila.., Yh l85~,r369'.
<br />qeneral S~la"ll. of the 'body su~fusiform, very much swnljen l1!'t~r:orly, aM
<br />tapering very suddenly fl'om the dorsal fin lowards the /lasc of t"e,qa~~al. ';l'he
<br />Lody iLself is ~'ompTeS$;,d ; iLs groatest deplh. in,the middle of tile distane\, b,:tW,~eI\
<br />tho 'oecipllt nn<l,the Ilnlerior 1;largin of ihe dor.al fin, i8 three i,nehe'8.llnd II
<br />quarter; whilst iLs limst' depth on tile middle of the peduncle of the tail, js a little
<br />JeS8 than an inch. The gl'elll~stlhickness at the origin of the bo~yisone inch
<br />and three-quarters, and on the middle of the pedunde .of the tail, half 1t~linch. '
<br />The head i8 very much depress~d above) and slopes I'llpidly frolll ,th~ ,nape to -
<br />the snout. It eonslilules one-fourth of the lol,allcng_th, measured fro,nlthc 8n04t
<br />to the jloslerior Dlargili orthe op.erculum.The upper part.o(the I~ead iSc.Qn-
<br />tained 8ix time8 in the length. The eyes are proportionally small, subcircular,
<br />elougated longitudinally illlo an elliptical share, Their dillmeter,entel'll about
<br />eighl time. III ~he lellllth Hr the SI'W ur the hea.!, and three times fnlln ,the tip of
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<br />, ;~tJRIA,~l)p COLORA,DO JtrvERS.~,.,:
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<br />~bo 8nfJut to the pupil; 'Thenoslrils, vety brolldlyopen,' are situated nellr to ~Ie
<br />u}1p~r ratt oftlie head; Ii~d'~iueh' ~ellrer lI'~"~rbit th"n~he end of the sno'ut.
<br />The mouth is tole~~lt I~rg?; (LIld th~ ja:"'s.llresurrou~d';db.f quite~onspieu~us
<br />,'Iips, but deprived of barbels of Ilny kind. . The p08terior'extremilror the max-
<br />illary d.o'es 'np,t'reae)1 a vertie!!.1 :line from th~ PIlP'j1 ,IJlOug\1 extending beyondlhe .
<br />anterior ~iJ~b(~he,or~lt: " The"hpp~T ja,,: overJap~ the lower one, as seen in
<br />figures 2 and 3.. The brahehiosteglll' fIly~;aresix'in number, three on either
<br />Bide; very liroadly jt~tte;jeilan~ clo'!'3lyco/llb;'n~d: ','Phi>gill opening.'llre quite
<br />large, beh~g 6nly'i;eparateii'~onealhby :an 'isthmll~, ofsjx-eighlhs of a~ ill~h.
<br />M~eous p.ores onth~'h~<,I arenotei:Jnspi~uous i .Ii seRes:, howiher, more apparent
<br />lhan the :re~t,ni3Y be traced from theoclcipuUo ,the sf/i!!JI, p.assing under th'l eye.
<br />The,dorsal ~I~, situated eXa~lIy OIl, the mi4diq of iha' back, is u liLlle I;igher
<br />tha.nlong ,and i;Fgh~ly' e9ncave 'on 'its up'l'e,rnl~~'ill ;it is'composedof flille soft
<br />. rnys !lnda rudilllenlary 8pine. The posterior ray i8 the shortest, and half the
<br />height ~r thellnteriut 801\. o~ l.hc highest on\l.' AlIbl;t the laLler \lifurcato three
<br />times, tl}oughthe brll.nches, ofthe'~hird ~irUrc!ltioll .rc~\lain_ln dose conligility.
<br />The elludalfin .i8" PQ.~t~riorly e9JargilJatlld i'l thp shal"jl Qf a 'cre6CCI!l, 1100 upper
<br />alld lower lob", bci!lg syulmetrical;, it \jl-clljuposc<\' of :ninctcen, 601~letiJllCS o.lIly
<br />eighteen, well,de~eloped riLYs; and fif\een-ruiliuiellts, ~i~11t'of.th~1Il IllJ~v.l\ ~nd
<br />t;Q\'cn below, The'si:':t~eu me!lial' ooes .8.[0 .ljifurcaled. three ~i,ue~ in t\;e 6llU1e
<br />'J:!I~nncras,in the,<\prsalfin~ 5he anal, .ituii~ed ~a~kof ~hedQr~al, has pretly,
<br />~tJeh the 6!llIle~halie.ivith it, b~ng higher than long, andsJ1ghLly cOllcaye e.xte-
<br />~iorly, but ,it !S pr~l.'orHonall'y 10lver po~tcrjo.rb', the 141teriopoftmy'I'avin~ ai'
<br />If!o~t three timeslh~ h:eight of the posterior. The TiLYS of which it is compQ,sed
<br />'~riJ "i.fuTeilcdlik~~I~ose of \.he dQrs~ I, the_llnterjof ~of! Olle, however reulailiillg
<br />undivided, 'The ven~flllsi unifouply Tow1ded posteTI~rly, Ilfelllse)'\~d ill advance
<br />pf the anteriprm~rgin of the. ~on;III, IIn.d \l'lle~'.llltnt~ack\Vard8 they do. not
<br />rlll\~ll'\heauus i11'ih~ fel!lirle; \hey ~~~l !lo\l;ever,10\lger i;l'the malo. '{'heyai'a
<br />cpmpose4- ?i: nihe .rayp" ~Ii ~of1.; but. ihe, ante,ri'or' nnp i8 u'l)diyid~d anll short.er
<br />\h~~'tl\a 8eeOJI<\; tb!3IIls.~ an~ !,hortes\-is li~!3wii;e~ndi\'ided; tho int~rJlleQia~e
<br />o~es ~lfp. l1ifur"ate,~.88 .in the I1DaI, el!-udlll, 8n4 -dors;rl. 'l11l!ppelora Is are ,YlJry
<br />J1rl?ad exteriorIY;.,co~VQsed pffine~n Or_8eyen.t.e~1I SoO:~nd th!~e tilll!,8 L\fur,eated
<br />'. rays, u!e, threeI1l5t:one~ ~cry'slender and 8~a\l. TI~eir poslerio,!' exl(~ml!y,
<br />'" when 'brQught baCkwards, does not l'ClJ,ch lite insertipn of the. \:enHa)s in \he
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<br />'i..,fclIlalej ,whi!s\' in thelllal~ they e~te"d beyond. . ,fOfllHila .of ~he fills; "
<br />" lDr,3.3;D1.9;CB.l.B.~.1.7;A1.9;Y'l.9;P.15: .
<br />.. ".The 9c~les 'Ire quire diversified, an<\ of dift~rent sizes on the differenl rogion~
<br />"'of the body., 1;'hey are very smaH on the dorsal region) belwce!ltho. oe<;:!plll.and
<br />ii', ~~l1ilIl tin (Ihey inerea~e ~tJillewhat i(l 8ize "dweel) ~he dors,,! and elludlll fin8,
<br />, 'lIJ1d .bccom~almpst uriifonn'on the tail. Thpse on the; f1an~s !lre tbe largest
<br />~nd 'mos~ eOllspicuous, whilst their' s1Zll is ogain .1~edu~e4 pll,the bel.l)', f(<;JIlI ~he
<br />. throat ~o t!]e annl fin.' Th\)laleralline is vcr)' dislinet,lfIakingn6IighliuBe;s:~on
<br />~q tbe flanks, running tbrougldhe middle region ~ lh~ laillo the candal fin,-
<br />.1'hecolor is uniform grayish brown above, yell~wis.h bencath. 'The fin"a~-
<br />"., .llume the linls of the region'of tl..i body to which theI Lelong.
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