164 DESCRIPTION OF 



Section I. — Smooth Mela>'le. 

 Melanu Hildrethuxa. Plate 5., Fig. 1. 



Testa l<Bti, fusiformi, subcrassd, corned ; spird brevi, mucronatd ; suturis valde impressis ; anfrac- 

 tibus quinis, convex-is ; aperturd magna, ovata, infernt angulatd, vel alba vel purpurea. 



Shell smooth, fusifonn, rather thick, hom-colour; spire short, pointed at the apex; sutures deeply 

 impressed: whorls fire, convex; aperture large, angular at base, ovate, white or purple. 



Hab. Oiiio River, near Marietta. Dr. Hildretli. 



My Cabinet, and Cabinets of Dr. Hildreth and P. H. Nicklin. 

 Diam. .25, Length .37 of an inch. 



o 



Remarks. — The aperture of this little species is nearly two-thirds the lenofth 

 of the shell. In outline it is allied to M.fusiformis herein described. It may 

 be distinguished by the sutures being more impressed, and the base being 

 more angular. One of the specimens is purple on the columella, and at the 

 base. I dedicate it to Dr. Hildreth, to whose kindness I owe several speci- 

 mens. 



Melania castaxea. Plate 5., Fig. 2. 



Testa l<Exi, clataformL subtenui, tenehroso-castaned ; spird elevatd, prope apicem carinatd ; suturis 

 partis; anfractibus octonis, convexiusculis; aperturd pared, eUipticd, purpurea. 



Shell smooth, club-shaped, rather thin, dark brown ; spire elevated, carinate towards the apex ; sutures 

 small; whorls eight, somewhat convex ; aperture small, elliptical, purple. 



Hab. Maury County, Tenn. Thos. R. Dutton. 



My Cabinet, and Cabinet of T. R. Dutton. 

 Diam. .2.5, Length .67 of an inch. 



Re/narks. — This species is remarkable for its club-shaped form. It differs 

 from the davcEformis herein described, in having a less pointed apex, in being 

 a smaller species, and in being of a darker colour. The first three or four 

 whorls are carinate, and disposed also to be striate and plicate. The aperture 

 is about one-third the length of the shell. The three individuals before me 

 are entirely purple inside, and this gives a very dark appearance to the shell. 



