OTHER BIVALVE A/[OLLUSKS 



97 



Smaller, nearly circular, white, with a pink hinge 

 area. I have found pretty specimens as far north 

 as Monterey. 



Semele pulchra, Sby., the Beautiful Semele, has 

 a small, thin, oval shell, with crowded concentric 

 sculpture and radiating lines at the sides. This is 

 a southern species, but the variety montereyi^ Anld., 

 is found farther north, as its name indicates. It is 

 less than an inch in length, oval, thin, ventricose, 

 the beaks quite posterior to the middle ot the shell ; 

 the pallial sinus is very large, being rounded and 

 expanded interiorly. 



Semele calif ornica^ Ads., the California Semele, is 

 a southern species, very rarely found. The shell 

 is about an inch in length. It is the same as the 

 yellow Semele flavescetis^ of Gould. 



Semele rubro-picta, Dall, the Rose-painted Se- 

 mele, is thick, convex, white, with rose rays on the 

 outside, and marked with heavy, interrupted con- 

 centric ridges and obsolete radial striation. The 

 surface is not granular. This is a southern species, 

 found near San Diego. It is very probable that 

 there are other species ot this difficult genus, that are 

 not yet described. 



Cumingia calif ornica^ Conr., 

 the California Cuming-shell, is 

 shown in Figure 76. It is some- 



Fig. 76 



what triangular in outline, with 

 the front end rounded and the 

 rear end narrowed and slightly 

 twisted. The lines of growth are very distinct, form- 

 ing concentric ridges. The shape of the shell varies 



