. Annual report - Western Society of Malacologists. Mollusks; Mollusks. Acknowledgments The author wishes to express her sincere thanks to C. Zoila Castillo R. for the help given in the classi- fication of the studied species and to Andres Reda Deara for his instructive collaboration in the collection of the biological material. Literature Cited Burch, 1960. Chromosome studies of aquatic pulmonale snails. Nucleus 3: 177-208. 1961. The chromosomes of Planorbarias comeus (Linnaeus), with a discussion on the value of chromo- some numbers in snail systematics. Basteria 25 (4/5): 45-52. 1
. Annual report - Western Society of Malacologists. Mollusks; Mollusks. Acknowledgments The author wishes to express her sincere thanks to C. Zoila Castillo R. for the help given in the classi- fication of the studied species and to Andres Reda Deara for his instructive collaboration in the collection of the biological material. Literature Cited Burch, 1960. Chromosome studies of aquatic pulmonale snails. Nucleus 3: 177-208. 1961. The chromosomes of Planorbarias comeus (Linnaeus), with a discussion on the value of chromo- some numbers in snail systematics. Basteria 25 (4/5): 45-52. 1982. Fresh water snails (Mollusca-Gastropoda) of North America. Environmental Protection Agency, Cincinnati, Ohio. I- VI- 294 p. Inaba, A. 1965. Cytotaxonomy studies of fresh water gastropods. Venus 23(4): 223-228. Kligerman, A D. and Bloom, 1977. Rapid chromosome preparation from solid tissues of fishes. J. Fish. Res. Board. Can 34: 266-269. Levan, A. Fredga & Sandberg, 1964. Nomenclature for centromeric position of chro- mosomes. HerediUs 52 : 201-220. Pain,T. 1964. The Pomacea Jlagellaia complex in Central America. Joum. Conchol. 25: 224- 231. Yam, 1986. Analisis cariologico de la especie, Pomacea patula catemacensis (Baker, 1922). Tesis de Licenciatura Facultad de Ciencias UN AM 45 p. Figure 2. Birramean chromosomes (2n=26). Figure 3. Chromosomes of Pomacea Figure 4. Chromosomes of Pomacea flagellata. Annual Report, Vol. 25. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Western Society of Malacologists. Pomona, Calif. , Western Society of Malacologists
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