196 SMALL BIVALVES. 



that the ligament continues in a nearly straight line 

 with the upper edge of the shell, while in modestus, 

 as shown in Fig. 167, it slants sharply downward. 

 The shell is white, about an inch in length. 



Angulus Gouldii, Hanley, Gould'-i-i, is small, oval, 

 inflated, a little angled at the beaks and slightly bent 

 at the posterior end. About half an inch long; 

 southern. 



Angulus variegatus, Cpr., va-ri-e-ga-tus. Similar 

 in shape to Fig. 167, but smaller. Pink and white, 

 glossy, flat and narrow, hardly half an inch long. 



CEdalia siib-diaphana, Cpr., B-da'-li-a sub-di-af- 

 a-na. This species has a thin, white, glistening shell, 

 which appears quite swolen. The hinge- teeth are 

 central, and the short ligament is situated almost 

 between the prominent beaks. Length half an inch; 

 southern. 



Fig. 168 gives us a good idea of the shape of our 

 next shell, Cumingia Californica, Conr. , Cum-in'-gi-a 

 ^0=^. Cal-i-for'-ni-ca. It is somewhat 



^^pfe^B^ triangular in outline, with the 

 J^^^^^^Umk front end rounded, and the rear 

 ^^^^^^^^^^H| end narrower and slightly twisted. 

 ^^^^^^^^^^ The lines of growth are very dis- 

 ^^^^sfe^ tinct, forming concentric ridges. 

 Fig. 16S. The shape of the shell varies con- 



siderably in different specimens. Pallial sinus large, 

 color white, length about an inch. It is occasionally 

 found in Monterey bay, but is more common to the 

 southward. 



A very pretty little shell sometimes found at Mon- 

 terey and sometimes far to the north, is named Mcera 

 salmonea, Cpr., Me'-ra sal-mo'-ne-a. It is nearly 

 rectangular in outline, the beaks being near one cor- 



