31 



stages in either species can hardly be overestimated, and the at- 

 tention of observers at the Cape and in California is hereby re- 

 spectfully called to the matter. Either species would probably 

 do well in an aquarium. Dall.] 



322 Mytilus edulis Linne 



San Diego bay; not numerous; probably introduced. 



323 Mytilus bifurcatus .See 1949. 



Abundant near high-water mark all along the coast. 



324 Modiola recta Conr 

 False bay; rare. 



325 Modiolaria denticulata Dall 

 San Diego (young). 



326 Adula falcata Gld 



La Playa and elsewhere in rocks. 



327 Adula stylina Cpr 



In rocks on beaches; not rare. 



328 Lithophagus plumula Hanley 

 La Playa, with pholads; rare. 



329 Lima dehiscens Conr 



Under stones, living near high-water mark, False Bay, April, 

 1882. Also Todos Santos bay, but not found alive. 



330 Hinnites giganteus Gray 



This fine species we find abundant at La Playa, but elsewhere 

 on the coast it appears rare, though not absent. 



331 Placunanomia macroschisma Desh 



Usually inhabiting deep water, attached to stones or bones of 

 whales. Rarely collected. 



332 Platidia anomioides (Scacchi) Costa var? 



Terebratula anomioides Scacchi, Phil Moll Sicil, ii, p 6 9, pi 

 xviii, fig 9, 1884. 



[Mediterranean; North Atlantic; Florida Strait; San Diego, 

 Cal., and Todos Santos bay, Orcutt. 



The shells which I refer to the above species are in general 

 like those from the Mediterranean. The differences are such as 

 might result from the habitat or place of attachment of the shells. 

 All the Californian specimens have the larger valve flat, with faint 

 ridges radiating from the umbo and becoming obsole e before 

 reaching the margin. The haemal (or dorsal) valve is convex, 

 and the foramen is often anteriorly angulated, though sometimes 

 round. In all the specimens the part of the foramen included in 

 the haemal valve is larger than that included in the neural valve. 

 The apophyses are similar to tho«e of Mediterranean specimens. 

 I have from the Caribbean sea a specimen similarly radiated, and 

 for this form perhaps we may apply the varietal name radiata. 



The special interest attaching to these little brachiopods arises 

 from the fact that this is the first time they have been reported 

 from the Pacific. The San Diego specimens were evidntly from 

 the beach; thoueh perfect, they were a little bleached. The single 

 specimen from Todos Santos bay, though dry, contained the re- 

 mains of the soft parts. D.] 



