XI 



Subgenus Ceriphasia, Swainson. 



Cerithiform ; outer lip thin, dilated at the base ; aperture small, 

 slightly emarginate, without any internal groove ; inner lip 

 thin. C sulcata, Sw., fig, 38 (figs. 



2 and 3 of this work). Founded ^'s-^' ^'^■^• 



on certain Ohio shells resembling 

 Cerithiclea? 



It will be noticed that in 

 the above classification 3Iela- 

 fusus is a subgenus of Melan- 

 02)sis, which belongs to the 

 family ^lelanojndce, while Ce- 

 riphasia is a subgenus of Cerithiclea, which includes 

 shells belonging to the family Cerithiidcef 



Dr. Gray (Proceed. Zool. Soc, London, 1847, p. 

 153) makes the following division of his subfamily 

 Melaniaina, which in many respects is very correct. 

 He separates the exotic genera from the American, 

 and of the latter quotes the following : 



Anculotus, Say, 1825. 



Ancxdosa, Swains., 1840 — A. pramorsa, Say. 

 3Ielano2)sis, sp., Moricand — 31. crenocarina.* 

 Anculosa, sp., Anthony — Anc. ruhiginosa. 

 Melania, sp.. Say — Melan. obovata. 



Melatoma, Anthony, 184- ? not Swains., 1840. 



Melat. altilis, Anthony. 



lo, Lea, 1832. 



Fusus, sp., Say, 1825. ) ^ nuviatiU^ Sav 



3felafusus, Swains., 1840. f ^ususJtuviatUi6, bay. 



Melania, sp.. Say — Mel. armigera, Say. 

 Ceriphasia, Swains., 1840. 

 Gray, Syn., 1844. 



3felania, sp,. Say — Ceriphasia sulcata, Swains. 



? Telescopella. 



3Ielania, sp., Saj- — 3[el. undulata, Say. 



Glotella, Qvay. 

 3[elania armigera, Sa}'. 



• =s Verena, H. & A. Adams ; certainly not an Anculosa. — T. 



