148 NEW UNIONIDiE, MELANIDiE, ETC., 



My cabinet and cabinet of A. 0. Currier. 

 Diam. -31, Length 1-26 ? inch. 



Remarhs. — I have seven specimens before me for examination, none of which are 

 perfect at the apex, and therefore the number of whorls is somewhat uncertain. It 

 is a well characterized shell, all the specimens being without any variation except in 

 age. There are five dark brown bands, the upper and lower being the broadest. 

 The lower two of the three in the middle are on two revolving striiB. The whorls 

 above the body whorls exhibit two of the five bands all the way to the apex. In old 

 individuals the outer lip is much expanded and slightly thickened inside of the edge. 

 It is allied to Melania {Trypanostoma) elongata, (nobis,) but may easily be dis. 

 tinguished by being more attenuate, smaller, thinner, and in having five bands. The 

 aperture is about one-fiftli the length of the shell. I name this after Mr. A. 0. Cur- 

 rier, to whom I am indebted for it. 



Teypanostoma carinatum. pi. 23, fig. 62. 



Testa carinata, acuto conica, rufo-cornea, tenui, diapliana ; spira acutoconica, mucronata; suturis valde 

 impressis ; anfractibus instar novenis, carinatis, superne striatis ; apertura parviuscula, rhomboidea j 

 labro acuto, sinuoso ; columella aliquanto incrassata et contorta. 



Shell carinate, acutely conical, reddish horn-color, thin, transparent ; spire acutely 

 conical and sharp at the point ; sutures very much impressed ; whorls about nine, 

 carinate and striate above ; aperture rather small and rhomboidal ; outer lip acute, 

 sinuous ; columella somewhat thickened and twisted. 



Proc. Acad. Nat. Sci. 1864, p. 4. 



Eah. — Bull Run, Tributary to Clinch River, East Tenn., Major S. S. Lyon, U.S.E. 



My cabinet. 

 Diam. -19, Length -44 inch. 



RemarTcs. — Two specimens only were received, having somewhat the aspect of 

 young shells, but I suspect they are nearly if not quite mature. It is evidently a 

 delicate species. It has rather a wide channel, with the outer lip not much produced. 

 In outline it resembles Melania (Ooniobasis) sculptilis, (nobis,) but difiers from it 

 generically as well as being shorter in the spire and in not having deep striae over the 

 whole of the whorls. The aperture is more than one-third the length of the shell. 



Trtpanostoma corneum. pi. 23, fig. 63, 



Testa striata, exserta, tenui, subdiaphana, dilute cornea ; spira elevata ; suturis regulariter impressis ; 

 anfractibus octonis, subconvexis; apertura elongata, constricto-elliptica, intus albida; labro acuto, 

 valde sinuoso; columella tenui et contorta. 



Shell striate, exserted, thin, semi-transparent, pale horn-color ; spire raised ; 



