. Bulletin. Science; Natural history; Natural history. CALLOPLAX THIELE. 1909. IN THE AMERICAS 61. 1 60/(m Fig. 5. Catloplax vivipcinis (Plate. 1902). Aniofagasla. Chile (LACM 75-17). Disarticulated spec- imen, length ca. 8 mm. A. Anterior and posterior valves. B. Intermediate valve. C. Girdle scales. defined lateral areas with two strong radial ribs; the central areas have about S longitudinal riblets per side, well marked in the pleural areas btit becoming ob- solete at the jugum. The riblets tend to converge anteriorl> and are not latticed. The girdle is covered with very small scales, t
. Bulletin. Science; Natural history; Natural history. CALLOPLAX THIELE. 1909. IN THE AMERICAS 61. 1 60/(m Fig. 5. Catloplax vivipcinis (Plate. 1902). Aniofagasla. Chile (LACM 75-17). Disarticulated spec- imen, length ca. 8 mm. A. Anterior and posterior valves. B. Intermediate valve. C. Girdle scales. defined lateral areas with two strong radial ribs; the central areas have about S longitudinal riblets per side, well marked in the pleural areas btit becoming ob- solete at the jugum. The riblets tend to converge anteriorl> and are not latticed. The girdle is covered with very small scales, the features (? striations) of which are unclear; occasional spicules are seen interspersed among the scales. Gray's specimen conforms well to Plates description and illustrations ol' Callistocliiion vivipcinis. The two lots of chitons collected in Chile by Dr. J. H. McLean, mentioned above, were also found to be conspecific with C. vivipanis. The first lot (LACM 75-10: "Intertidal, Pozo Toyo (S of Iquique), Tarapaca Chile (2()°25'S, 70°'W)./f,c?. J. H. McLean, sta. Sept., 1 Oct., I975"") consists of a single specimen, preserved in alcohol, discovered in a lot of 26 specimens of Cailisio- ciiilon piilchclliis (Gray, 1828) [not "Ciillislochilon piiU liclliis" o\' Pilsbr\ ami other authors =C(iilisl()vhitou periconis Dall. tl9()8|. v\'hich il grealh lesenibles ill color, size, and shape. Ihe specimen measures (i,8 mm in length: it has 11 radial ribs in the anterior valve, and 8 in the posterior valve. The girdle shows a conspicuous fringe of spicules in addition to occasional spicules amitlsi the girdle scales. The second lot (LACM 75-17: â 'Intertidal, mainland E of Isla Santa Maria. N of Antofagasta, Antofagasta Prov., Chile (23°25'S. 7(n6'W), Ici;. J. H. McLean & .lorge lomicic, sta. 8, 7 1975"), also in alcohol, consists of 16 specimens preserved fully extended. In length, including girdle, the largest of the sp
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