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PROCEEDINGS OF THE DESERT FISHES COUNCIL
<br />Naiman, Robert J. & David J. Soltz (eds.). 1981.
<br />Fishes in North American Deserts. John Wiley &
<br />Sons, New York USA.
<br />Nesom, Guy L. 1979. A new species of Erigeron
<br />(Compositae) from Coahuila. Sida 8(1):65-70.
<br />. 1981. Five new species of Mexican Erigeron
<br />(Asteraceae). Madrono 28(3); 136-147.
<br />. 1992. A new gypsophilic species of Xylothamia
<br />(Asteraceae: Astereae) from Cuatro Cienegas area of
<br />Coahuila, Mexico. Phytologia 73(4):318.
<br />. 1992. A new species of Nama (Asteraceae:
<br />Astereae) from the Cuatro Cienegas area of
<br />Coahuila, Mexico. Phytologia 73:61-63.
<br />Obregon-Barbosa, H. & Salvador Contreras-Balderas.
<br />1988. Una nueva especies de pez del g6nero
<br />Xiphophorus del grupo couchianus en Coahuila,
<br />Mexico. Publicaciones Biol6gicas, Facultad
<br />Ciencias Biol6gicas Universidad Aut6noma de
<br />Nuevo Le6n (Mexico) 2(3):93-124.
<br />Olson, R. Earl. 1973. Variation in the canyon lizard,
<br />Sceloporus merriami Stejneger. Herpetologica
<br />29(2):116-127.
<br />. 1978. Biogeographic and ecologic analysis of
<br />the herpetofauna in the northern Chihuahuan
<br />Desert. Doctoral Dissertation. University of
<br />Colorado, Boulder USA.
<br />1979. Sceloporus merriami. Catalog of
<br />American Amphibians & Reptiles 227.1-227.2.
<br />Ono, R. Dana, James D. Williams & Anne Wagner.
<br />1983. Vanishing Fishes of North America. Stone
<br />Wall Press, Washington, District of Columbia USA.
<br />Ownbey, Gerald B. 1982. A study of four species of
<br />Ciusium native to Mexico. Phytologia 50(5):317-326.
<br />& Donald J. Pinkava. 1980. Cirsium coahuilense
<br />(Asteraceae), a new species from northern Mexico.
<br />Systematic Botany 5(3):172-174.
<br />Parfitt, Bruce D. & Donald J. Pinkava. 1978. A new
<br />species of Mimosa (Leguminosae) from Coahuila,
<br />Mexico. Brittonia 30(2):172-174.
<br />& Donald J. Pinkava. 1988. Nomenclatorial and
<br />systematic reassessment of Opuntia engelmannii and
<br />0. lindheimeri (Cactaceae). Madrono 35:342-349.
<br />Parker, William S. 1982. Sceloporus magister. Catalog
<br />of American Amphibians & Reptiles 290.1-290.4.
<br />1982. Masticophis taeniatus. Ibid. 304.1-304.4.
<br />Parodiz, J. J. 1969. The Tertiary non-marine Mollusca
<br />of South America. Annals of the Carnegie Museum
<br />40:1-242.
<br />Parsons, Thomas S. 1968. Variation in the choanal
<br />structure of Recent turtles. Canadian Journal of
<br />Zoology 46(6):1235-1263.
<br />Patterson, Robert. 1973. Why tortoises float. Journal
<br />of Herpetology 7(4):373-375.
<br />Peden, Alex E. 1970. Courtship behaviour of.
<br />Gambusia (Poeciliidae), with emphasis on isolating
<br />mechanisms. Doctoral Dissertation. The University
<br />of Texas, Austin USA.
<br />1993 - VOLUME XXV
<br />. 1972. Differences in the external genitalia of
<br />female gambusiin fishes. The Southwestern
<br />Naturalist 17(3):265-272.
<br />. 1972. The function of gonopodial parts and
<br />behavioral pattern during copulation by Gambusia
<br />(Poeciliidae). Canadian Journal of Zoology
<br />50(7):955-968.
<br />Pentecost, Allan. 1988. Observations on the growth
<br />rates and calcium carbonate deposition in the green
<br />alga Gongrosira. New Phytologist 110:249-253.
<br />Peters, James A. 1951. Studies on the lizard
<br />Holbrookia texana (Troschel) with descriptions of
<br />two new subspecies. Occasional Papers of the
<br />University of Michigan Museum of Zoology
<br />537:11-20.
<br />Pinkava, Donald J. 1969. Preliminary investigations of
<br />the flora and vegetation of the Cuatro Cienegas
<br />Basin, Coahuila, Mexico. Proceedings Supplement,
<br />Journal of Arizona Academy of Sciences 1969:13
<br />(abstr.).
<br />. 1976. A new species of cholla (Cactaceae:
<br />Opuntia) from Coahuila, Mexico. Madrono
<br />23:292-294.
<br />1978. Vegetation and flora of the Cuatro
<br />Cienegas basin, Coahuila, Mexico. Pp. 327-333, in
<br />Roland H. Wauer & David Riskind (eds.). 1978.
<br />Transactions of the Symposium on the Biological
<br />Resources of the Chihuahuan Desert Region,
<br />United States and Mexico. U.S. National Park
<br />Service Transactions and Proceedings Series 3(1977).
<br />Government Printing Office, Washington, District of
<br />Columbia USA.
<br />. 1979. Vegetation and flora of the Bols6n of
<br />Cuatro Cienegas region, Coahuila, Mexico: I.
<br />Boletin de la Sociedad BotSnica de Mexico
<br />38(1):35-73.
<br />1980. Ibid.: It. Ibid. 39(1):107-127.
<br />1981. Ibid.: 111. Ibid. 41(1):127-151.
<br />1984. Ibid.: IV. Summary, endemism and
<br />corrected catalogue. Pp. 23-48, in Paul C. Marsh
<br />(ed.). Biota of Cuatro Cienegas, Coahuila, Mexico:
<br />Proceedings of a Special Symposium. Fourteenth
<br />Annual Meeting, Desert Fishes Council, Tempe,
<br />Arizona USA, 18-20 November 1983. Journal of the
<br />Arizona-Nevada Academy of Science 19(1).
<br />. 1987. An urgent need for preservation: Cuatro
<br />Cienegas. Agave (Quarterly Magazine, Desert
<br />Botanical Garden, Phoenix, Arizona USA.) 2(4):7-9.
<br />& David J. Kell. 1977. Chromosome counts of
<br />the Compositae from the United States and Mexico.
<br />American Journal of Botany 64:680-686.
<br />Lyle Angus McGill & Timothy Reeves. 1977.
<br />Chromosome numbers in some cacti of western
<br />North America. III. Bulletin of the Torrey
<br />Botanical Club 104(1):105-110.
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