99 

 Cal., in 391 fins. 



1445 Ischnochiton sarcosus Dall. 



Chiton rather elongate, marbled with scarlet and white, paler 

 mesially, rather low and not carinate; the girdle densely set with 

 small, curved, smooth bristles of different sizes, dark rod and 

 white mixed; underside of girdle chocolate color, and interior of 

 valves flesh pink; dorsal angle somewhat more than 110 degrees, 

 the jugal region being rounded off; intermediate valves with 

 prominent lateral areas hardly concentrically or radially sculp- 

 tured, but finely punctate all over and more or less serrate near 

 girdle on posterior margin; jugum not defined, central area of 

 valves longitudinally sculptured with low inosculating wrinkles 

 which sometimes form diamond-shaped interstitial excavations; 

 whole sculpture has an obsolete appearance; anterior valve finely 

 punctate, feebly concentrically sculptured; posterior valve the 

 same, with a low subcentral mucro as in I. magdalenensis; ante- 

 rior valve with about 8, posterior about 10 slits, intermediate 

 valves with 2 slits; sinus wide, entire; pleural laminaa wide, short; 

 Ion. in the dry state 3 6, lat. 15, alt. 5 mm. 



Type locality: — off San Martin Island, Baja Cal., in 30 fms. 

 (Fred Baker). 



Portugese Band, near San Pedro, Cal. (T. S. Oldroyd). 



1446 Leda hamata Cpr. 



Near Catalina Island, Cal., in about 50 fms. 



Shell small, compressed, of a dark chestnut brown. 



1447 Pecten Randolphi Dall, Nautilus 11:86. 



Occurs in deep water from Bering Sea to West Mexico, in 

 from 225-1005 fms. 



Shell subtranslucent white, glossy, extremely thin. 



1448 Pecten Davidsoni Dall, Nautilus 11:86. 



Bering Sea and the Aleutian Islands and eastward to Kadiak 

 Island, Alaska, in 280-351 fms. 



Shell waxen white, having the aspect of a Propeamusium ex- 

 ternally, but really belonging in the section Pseudamusium. 



Named in honor of Prof. George Davidson, the distinguished 

 geographer and astronomer. 



1449 Crenella niegas Dall. 



Type locality: — Panama bay, 33 fms. 



1450 Limopsis Panamensis Dall. 



Type locality: — Panama bay, in 1020 fms. 



1451 Venus Kennicottii Dall. 

 Synonymy: — Mercenaria Kennicottii Dall. 



Neeah bay, Wash. (Swan); Little river, Mendocino co., Cal. 

 (Harford). 



Shell of a yellowish white with some ferruginous stains ex- 

 ternally. 



1452 Panopea globosa Dall. 



Type locality: — head of the Gulf of Cal. (Edward Palmer). 



Shell of a yellowish white, shorter, thinner, and more globose 

 than P. generosa and probably distinct. It reaches 160 mm. in 

 extreme length. 



1453 Panomya ampla Dall. 



