CONCHYLIA— I>JT^yi2^. xxxi. 



28. LUCINA. 



* foved, intemd. ohliqud. 



with the internal cavity oblique. 



1. lactea, orbicularis, striis transversis ii'regularibus. 



orbicular, with irregular transverse striae. 



2. Leucoma, subohliqua suhflexiiosa, striis crebris regularibus. 



somewhat oblique and flexuous, with crowded 

 regular striae. 



** foved interna rectiusculd. 

 with the internal cavity nearly straight. 



3. alba, valvd alterd unidentatd. 



a single tooth in one valve. 



4. rotundata, valvis bidentatis, Itevis. 



the valves two toothed, smooth. 



6. Radula, valvis bidentatis, striis crebris laminatis. 



the valves two-toothed, with crowded laminar 

 striae. 



5. undata, valvd alterd tridentata. 



one of the valves with three teeth. 



29. Strigilla. 



1. carnaria, striis hinc Jlexuoso-angulosis. 



with the striae angularly flexuous on one side, 



2. pisiformis, slriis hinc ucidangidosis. 



the striae acutangnlar on one side. 



