xxxTi, CONCHYLIA— DJTHrR^. 



16. sinuosa, sinu longitudinali ah umbone. 



with a longitudinal sinuosity from the beak. 



17. aurea, medio tumido, lateribus attenuatis. 



tumid in the middle, and tapering to the sides, 

 ft latere antico angulaio. 



angular at the anterior eide. 



18. virginea, striis trcnsversis planatis antici latioribus. 



with flat transverse striae ?/hich are broader at 

 the anterior side. 



19. nitens, medio tumido, striis obsolete reticulatis. 



tumid in the middle, and obscurely reticulate. 



20. decussata, striis decussatis antici tuberculosis, dentibus duobus 



Jissis. 



with decussate striae which are tubercular at the 



anterior side, and two of the teeth cloven. 



21. PuUastra, striis decussatis minutis antici rugosis, dente unico 



Jisso. 



with minute decussate striae which are rough at 



the anterior side, and one of the teeth cloven. 



37. Cytherea. 



1. Chione, ovato-cordata niiida. 



oval heart-shaped and polished. 



2. Guineensis, obliqu^ cor data, laminis transversis subimbricatis. 



obliquely heart-shaped, with transverse and some- 

 what imbricate plates. 



