OF CONCHOLOGY. 13 



3. Helicina Hanleyana, Pfeiffer. 



Plate 18, figures 22, 23. 



Subglobose, rather solid, with somewhat distant concentric im- 

 pressed lines ; spire convexly conic, suture impressed ; whorls 

 5, convex, the last well rounded ; aperture semi-circular, lip a 

 little expanded, thickened within. Reddish-brown, shining. 



Height 5*6, diam. 7'5 mill. 



Near New Orleans. 



4. Helicina chrysocheila, Binney. 



Plate 18, figure 24. 



Elevated conical, or pyramidal, thin, shining, surface very 

 finely punctured ; whorls 5, convex, indistinctly angular at 

 periphery, and the base somewhat flattened ; aperture large, sub- 

 oval, lip reflected. Flesh color or yellowish, interior of shell, 

 lip and callus polished, deep golden color. 



Height 8*3, diam. 10 mill. 



Texas and Mexico. 



5. Helicina subglobulosa, Poey. 



Plate 18, figure 25. 



Globosely conical, solid, lightly striate ; whorls six, the last 

 subangulate, base convex ; aperture broadly semioval, lip wide, 

 white, unicolor, or with two red bands, a broad one at the suture 

 and a narrower one at the periphery. 



Height 7, diam. 10 mill. 



Florida, (from Cuba) at Key Biscayne ; it is not known whether 

 it was accidentally introduced, or is a permanent resident. 



Family TRUNCATELLIDJE. 



Shell, cylindrical or pupoid, with small oval aperture and thin 

 spiral operculum. Whorls transversely ribbed. 



Animal with eyes at the rear of the base of the two contractile 

 tentacles. Unisexual. 



