I8CHNOCHITON. 123 



I. AUREOTINCTUS Carpenter, n. sp. Un figured. 



Shell resembling I. scabrieostatus, but the lateral areas are 

 scarcely defined, radial and longitudinal series of lira? none. 

 Entire surface equally granulated. Orange spotted with red. 

 Interior: posterior valve having 11, central valve 1, anterior valve 

 13 slits. Length 61, breadth 4 mill.; divergence 100. (Cpr.) 



Catalina Island, Gal., 80 fms. 



This species is known from Tr. flaxus by the valves not being 

 beaked, and by the large striated scales of the margin, which 

 resemble those of /. scabrieostatus. ( Cpr.~) 



I. DECIPIENS Carpenter, n. sp. Unfigured. 



Shell exactly like I. pectinulatus, but reddish, elevated, the ju gum 

 acute; scales of the girdle small, striated. 



Length 15, breadth 1\ mill.; divergence 105. (Cpr.~) 



Monterey, California. 



This very puzzling shell differs from /. sinudentatus in its normal 

 sinus and smaller scales ; I cannot help suspecting that when more 

 specimens have been examined, it will be found that some characters 

 generally constant between species and even groups, are occasionally 

 variable in the same species. (Qor.) 



I. CORRUGATUS Carpenter, n. sp. Unfigured. 



Shell similar to Ch. sanguineus in form and varied coloring ; 

 entire surface granulose ; central areas having impressed punctate 

 wrinkles, hardly lirate ; lateral areas strongly longitudinally corru- 

 gated. Interior: posterior valve with 8-10, anterior valve 10-9, 

 central valves 1 slit. Sinus wide, flat. Girdle thin, covered with 

 very close, very small striatulate imbricating scales. 



Length 13i|, breadth 7 mill.; divergence 90-100. 



Catalina Is., beach to 40 fms. (Cooper, Cal. State Coll. Nos. 1066, 

 1070, 1074) ; Todos Santos Bay (Hemphill), California. 



Differs from Stenoplax sanguineus in sculpture as well as in the 

 plan of mantle-ornamentation. A specimen from Todos Santos 

 Bay (under a stone between tides) collected by Henry Hemphill, is 

 about the size of limaciformis from Mazatlan, and it would natur- 

 ally be so called ; the sculpture, however, is sensibly different, both 

 from that and from fallax. The central areas are minutely, the 

 jugal areas very minutely, wrinkle-punctate, wrinkles angular, 

 irregular; lateral areas moderately defined and elevated, and, 



