28 



301 Saxidomus nuttallii Conr 



Collected for food and rather abundant in places. 

 [The distinction between this and the following form is ofien 

 hardly specific. D.] 



302 Saxidomus aratus Gld. 



Found with the above and about equally plentiful. 



303 Venus (Chione) siniillima Sby 



San Diego. 



304 Cytherea undato-striata Cpr 



Dead valves only have been found of this; San Diego bay. 



305 Tapes staminea tuniida Sby. See No. 2180. 



306 Tapes staminea diversa Sby. See No. 2177. 



307 Tapes laciniata Cpr. See No. 2178. 



308 Cardium quadragenarium Conr 



La Playa; rare. Odd valves abundant at Todos Santos bay. 



309 Chama spinosa Sby 



Less abundant, frequenting deeper water. 



310 Lucina nuttallii Conr 

 San Diego. 



311 Lucina calif ornica Conr 

 San Diego. 



312 Diplodonta orbella Gld 



Found in holes in rocks or in dead bivalves at La Playa; not 

 rare. Also Todos Santos bay. A single example of a much flat- 

 ter species was found at San Diego, which is now in the collection 

 of the Philadelphia Academy of Sciences. 



213 Tellimya tumida Cpr 



San Diego; not found abundantly. 



314 Lasea rubra Mont 



Found in great numbers near high-water mark attached to 

 the byssus of Mytilus, in crevices, dead barnacles, and shells, or 

 among small stones. Also at Todos Santos bay. 



315 Kellia laperousii Desh. 



In dead shells or among rocks; not rare. 



316 Chlamydoconcha orcutti Dall 



Dall, Science, 4:50 (18J1 1884). U S na mu pr 1885, 549. 

 Or IT S na mu pr 1885, 549: — False bay, near San Diego, Cali- 

 fornia, under stones. 



Animal somewhat of the shape of a small globose Cypraea, 

 of inflated, ovoid form, translucent, jelly-like, dotted above with 

 small, rounded papillae, which appear of an opaque white on the 

 general translucent ground. Over an inch in length when living, 

 contracting in alcohol to less than half. Mantle covering the 

 dome of the body tough and thick; sides smooth, nearly free of 

 the papillae, superior median line a little depressed; basal part of 

 the anterior line in life prolonged beyond the general mass in a 

 trough with the convexity upward, and somewhat expanded at 



