institute of science, philadelphia. " loi 



Family PYRAMIDELLID^. 

 [The consideration of the minute and difficult species belonging to this 

 family is temporarily deferred.] 



Superfamily T^NIOGLOSSA. 



Family TRITONIID/E. 

 Genus TRITONIUM Link. 

 Subgenus Lampusia Schumacher. 

 Tritonium pileare Lamarck. 

 An imperfect specimen from the Caloosahatchie marls, after a good deal of 

 study, was determined to belong to this well-known species, which in the liv- 

 ing state is widely distributed over the tropics, and on the Atlantic coast of 

 North America extends from the Florida Keys to the coast of Mexico. 



Tritonium sp. indet. 

 A nucleus of some species of Tritonium, other than T. pileare, with about 

 one whorl of the succeeding series attached to it, was obtained from the marls 

 of the Caloosahatchie, but it is impossible to determine the species. 



Subgenus Colubraria Schumacher. 

 Tritonium lanceolatum Menke. 

 Colubraria lanceolata (Mke.) Dall, Rep. Blake Gastr. , p. 225, 1S89. 

 Ranella lanceolata Menke, Synop., p. 87, 1828. (Synon. e.xcl.) 



In the Pliocene marl of Shell Creek and the Caloosahatchie River, Florida. 

 Living from Cape Hatteras to the Antilles. 



Several specimens were obtained which do not seem to differ in any way 

 from the recent form. 



Family CASSIDID^. 



Genus CASSIS Lamarck. 



Subgenus Phalium Link. 



Section Semicassis Morch. 



Phalium globosum n. s. 



Upper Eocene of Mississippi, near Newton ; and of Florida in the num- 



mulitic limestone of Ocala, at Richard's quarry, collected by Mr. Willcox. 



Shell short and globose, with four smooth nuclear and five or six subse- 

 quent sculptured whorls, exhibiting three or four varices when adult ; young 

 shell rather blunt or short-spired, with spiral sculpture of very shallow, rather 

 wide, wavy grooves or channels, with much wider interspaces anteriorly, and 

 behind the shoulder finer and sharper sculpture of the same sort; whorls ap- 

 pressed with a cord, sometimes wavy or nodulous with very small nodules, 

 close to the suture ; shoulder with two not very strong carina, which are 

 usually wavy. or rippled by numerous small, narrow, transverse wavelets ; the 



