. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 56, Part 3, 1957. PLATE 22 Mexcylotus lutescens: 1, Mazatlan, Sinaloa; 2, Rosario, Sinaloa; 3, San Sabastian, Jalisco; 4, Ixtapan, Jalisco; 5, Zihuantanejo, Guerrero; 6, 1955 Fay survey site G-4, approximately 30 miles southeast of Acapulco, Guerfero; 7, state of Oaxaca. Mexcylotus petersi petersi: 9, La Placita (=Sulatillo), Michoacan. Mexcylotus petersi dumianensis: 10, San Pedro Damian Nara- jestilla, Michoacan. Neocyclotus dysoni berendti: 8, C
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 56, Part 3, 1957. PLATE 22 Mexcylotus lutescens: 1, Mazatlan, Sinaloa; 2, Rosario, Sinaloa; 3, San Sabastian, Jalisco; 4, Ixtapan, Jalisco; 5, Zihuantanejo, Guerrero; 6, 1955 Fay survey site G-4, approximately 30 miles southeast of Acapulco, Guerfero; 7, state of Oaxaca. Mexcylotus petersi petersi: 9, La Placita (=Sulatillo), Michoacan. Mexcylotus petersi dumianensis: 10, San Pedro Damian Nara- jestilla, Michoacan. Neocyclotus dysoni berendti: 8, Cliichen Itza, Yucatan. mm.; aperture height, mm.; whorls. UAIM 123-c (shell): PI. 23, figs. 9-10; width, mm.; height, mm.; aperture width, mm.; aperture height, mm.; whorls. UAIM 123-d (shell): PI. 23, figs. 11-12; width, mm.; height, mm.; aperture width, mm.; aperture height, mm.; whorls. UAIM 123-e (damaged shell): width, ca. mm; height, mm.; whorls. Ranges for UAIM 123: width, mm. to mm.; height, mm. to mm.; aperture width, mm. to mm.; aperture height, mm. to mm.; whorls, to Discussion: The five shells of lot UAIM 123 are basically described in the descriptions for cooperi and lutescens in the work of Bartsch and Morrison (1942: 180, 181). Features that seem characteristic, but not particularly diagnostic, are: a smooth nu- clear whorl of slightly over one turn which is well-rounded and forms a distinct apex, four of the five shells are moderately high- spired with the fifth (123-a) going toward the others, the oper- culum is dished but not deeply so (being more like a shallow 115. 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 Southern California Academy of Sciences. Los Angeles, Calif. : Th
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