158 MELVILL : MOLI-USCA OF S. CAROLINA AND FLORIDA. 



19. Purpura bicostalis (Lamk.) 



20. P. fasciata (Reeve.) 



2 1. P. floridana (Conrad.) 



All more or less common on the reefs. Key West. 



22. P. biserialis (BlvUe.) 



One shell referred by Mr. G. B. Sowerby, jun., to this 

 species may be but a variety of one of the preceding. 

 There seems to be as much variety among the Purpuric of 

 the sub-genus Stramonita as among the Nassae, which have 

 been so ably taken in hand by Mr. F. P. Marrat. 



23. Ricinula nodulosa (C. B. Adams.) 



On the reefs, Key West. 



Fam: OLIVID^. 



24. Oliva reticularis (Lam.) 



Not uncommon at Key West, but, as far as I have seen 

 specimens, all of one variety, with pale pink markings. 



25. O. litterata (Lam.) 



Charleston Harbour. This may prove to be but a 

 northern variety of O. reticnlafi'^ (Lamk.) 



26. O. mutica (Say.) 



South Carolina — especially on the breakwater by Sulli- 

 van's Island (now, I believe, removed). I also came acro;;s 

 the species on the Florida coast. 



27. O. nana (Lam.) 



Key West: 



28. O. exigua (Mart.) 



Key West. 



29. O. nivea (Gm.) = eburnea (Lam.) 



Key West. 



