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<br />a. absent or present but not in distinct <br />oblique rows (FIgs. 16, 45) ......... 273 <br />b. present in a distinct oblique row of 3 or <br />more melanophores near or along ven- <br />tral margin of one or both preopercles <br />(Fig. 17) .................. C. ardens <br /> <br />273 (272). Pigment on ventral surface of heart <br />region <br />a. absent (Fig. 45) .......... C. discobolus <br />b. present (Figs. 17, 44) ............. 274 <br /> <br />274 (273). Lateral surface of body below hori- <br />zontal myosepta (or lateral midline) <br />exclusive of melanophores asso- <br />ciated with horizontal myosepta, air <br />bladder, visceral cavity (peri- <br />toneum), or gut, <br />a. unpigmented or with s5 melanophores <br />(Figs. 17, 45) ................... 275 <br />b. pigmented with ~6 melanophores (Fig. <br />46) ................... C.discobolus <br /> <br />275 (274). Length from anterior margin of snout <br />to posterior margin of vent <br />a. 76-80% SL . . . . . . . . . . . . . . . . . . . .. 276 <br />b. 81% SL . . . . . . . . . . . . . . . . C. discobolus <br /> <br />276 (252,275). Number of myomeres to poster- <br />ior margin of vent <br /> <br />a. 34 ...................... C. ardens <br /> <br />b. 35-38 . . . . . . . . . . . . . . . . . . . . . . . .. 277 <br />c. 39-40 .................. C.discobolus <br /> <br />277 (246,253,264,276). Total number of myomeres <br />a. 43-46 . . . . . . . . . . . . . . . . . . . . . C. ardens <br />b. 47-48 . . . . . . . . . . . . . . . . . . . . . C. ardens <br />C. discobolus <br />c.49 ................... C.discobolus <br /> <br />278 (58,61,69,72,199,200,202). Longitudinal eye <br />diameter <br />a. 24-30% of head length ...... C. latipinnis <br />b. 31-35% of head length ...... . . . . .. 279 <br />c. 36-38% of head length ........ C. ardens <br /> <br />279 (236,255,257,266,278). Pigment on ventral <br />surface of heart region <br />a. absent (FIg. 59) ........... C. latipinnis <br />b. present (FIgs. 17,58) ............. 280 <br /> <br />280 (268,279). Number of myomeres to <br />posterior margin of vent <br />a. 34-35 . . . . . . . . . . . . . . . . . . . . . C. ardens <br /> <br />b. 36-38 . . . . . . . . . . . . . . . . . . . . . . . .. 281 <br />c. 39-40 ................... C./atipinnis <br /> <br />281 (280). Total number of myomeres <br />a. 43-45 . . . . . . . . . . . . . . . . . . . . . C. ardens <br /> <br />b. 46-48 . . . . . . . . . . . . . . . . . . . . . C. ardens <br />C. /atipinnis <br />c.49 .................... C.latipinnis <br /> <br />282 (24,39,41,195,196,198). Longitudinal eye <br />diameter <br />a. 27-30% of head length. . . . . . . X. texanus <br /> <br />b. 31-33% of head length . . . . . . . . . . .. 283 <br />c. 34-38% of head length ........ C. ardens <br /> <br />283 (249,282). Pigment on ventral surface of <br />heart region <br />a. absent (Fig. 88) ............ X. texanus <br />b. present (Figs. 17,87) ............. 284 <br /> <br />284 (283). Length from anterior margin of snout <br />to posterior margin of vent <br />a. 76-77% SL ................ C. ardens <br />b. 78-80% SL .................... 285 <br />c. 81-84% SL ............... X. texanus <br /> <br />285 (284). Number of myomeres to posterior <br />margin of vent <br />a. 34-35 . . . . . . . . . . . . . . . . . . . . . C. ardens <br /> <br />b. 36-38 . . . . . . . . . . . . . . . . . . . . . . . .. 286 <br />c. 41 . . . . . . . . . . . . . . . . . . . . X. texanus <br /> <br />286 (285). Total number of myomeres <br /> <br />a. 43 . . . . . . . . . . . . . . . . . . . . . C. ardens <br />b. 44-48 . . . . . . . . . . . . . . . . . . . . . C. ardens <br />X. texanus <br />c. 49 .. .. .. .. .. .. .. .. .. .. X. lexanus <br /> <br />287 (202,207,208). Longitudinal eye diameter <br />a. 24-34% of head length . . . . . . . . . . .. 294 <br />b. 35% of head length ........ C. latipinnis <br /> <br />288 (9,198,209,210). Longitudinal eye diameter <br />a. 24-26% of head length. . . . . C. discobo/us <br />b. 27-33% of head length . . . . . . . . . . .. 289 <br />c. 34% of head length ....... C. discobo/us <br /> <br />289 (248,288). Pigment over ventral to <br />ventro-Iateral surfaces of gill covers <br />(opercula) <br />a. absent or present but not in distinct <br />oblique rows (Figs. 45, 87) ......... 290 <br />b. present in a distinct oblique row of 3 or <br />more melanophores near or along ven- <br />tral margin of one or both preopercles <br />(Fig. 17) ................. X. lexanus <br /> <br />290 (250,289). Lateral surface of body below <br />horizontal myosepta (or lateral <br />midline) exclusive of melanophores <br />associated with horizontal myosepta, <br />air bladder, visceral cavity (peri- <br />toneum), or gut, <br />a. unpigmented or with s5 melanophores <br />(Figs. 45, 87) ................... 291 <br />b. pigmented with ~6 melanophores (Fig. <br />46) .................. C. discobolus <br /> <br />291 (290). Length from anterior margin of snout <br />to posterior margin of vent <br />a. 76-77% SL ............. C. discobolus <br />b. 78-81% SL .................... 304 <br />c. 82-84% SL ............... X. texanus <br /> <br />292 (154,157,178,204). Longitudinal eye diameter <br />a. 24-26% of head length . . . . . . C. /atipinnis <br />b. 27-33% of head length . . . . . . . . . . .. 306 <br />c. 34-35% of head length .. . . . . C. latipinnis <br /> <br />71 <br />