28 
301 Saxidomus nuttallii Conr 
Collected for food and rather abundant in piaces. 
[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) simillima Sby 
San Diego. 
304 Cytherea undato-striata Cpr 
Dead valves only have been found of this; San Diego bay. 
305 Tapes staminea tumida Sby. See No. 2180. 
306 Tapes staminea diversa Sby. See No, 2177. 
307 Tapes laciniata Cpr. See No, 2178. 
308 Cardium quadragenarium Corr 
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 californica 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 lLasea 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). US na mu pr 1885, 549. 
Or U 8S 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 
