Notes on Species of Coroiculadce. 



231 



rounded. The beaks are small. The valves are delicate and 

 the color of the interior is violet. The epidermis is blackish- 

 green. The stria? are obsolete. The hinge is narrow and slight. 

 The lateral teeth are long, narrow, and subequal. 



The Batissa triquetra is somewhat allied to Batissa CJtil- 

 drencie from the Philippines ; it is, however, fuller, more trigonal, 

 transversely shorter, and more delicate. 



4. Batissa ponderosa, Prime. 



Bitissa ponderosa, Prime. Bost. Soc. Nat. Hist. Proc. viii. 273. 1862. 1 

 Prime Cat. 5. 1863. 



B. testa ovato-orbiculari, oblique inaequilaterali, ventricosa, crassa, 



Fig. 62. 



Batissa ponderosa. 



solida; latere antico rotundato, postico latiore, obtuso ; umbonibus par- 



