136 NEW 'UNIONID^, MELANIDiE, ETC., 



it after Mr. Miles, State Zoologist of Michigan, who has kindly sent me many fresh 

 water and land shells from his State. 



GONIOBASIS INFORMIS. PI. 23, fig. 41. 



Testa Ijevi, cylindrico-conica, tenebroso-cornea, evittata ; spira parum exserta ; suturis irregulariter im- 

 pressis ; anfractibus instar septenis, in medio inipressis ; apertura parviuscula, subovata, intus albida ; 

 labro acuto, valde sinuoso ; columella alba, et valde contorta. 



Shell smooth, cylindrico-conical, dark horn-color, without bands ; spire somewhat 

 elevated ; sutures irregularly impressed ; whorls about seven, impressed in the 

 middle ; aperture rather small, nearly ovate, whitish within ; outer lips acute, very 

 sinuous ; columella white and very much twisted. ^ 

 Proc. Acad. Nat. Sci. 1863, p. 154. 



5a5.— Falls of the Ohio at Louisville, Ky., W. H. De Camp, M. D. 



My cabinet and cabinet of A. 0. Currier. 

 Diam. '19, Length '60 inch. 



Remarlcs. — Only two specimens were sent to me by Mr. Currier, one of which is 

 only about half grown. It is very different from any species I have seen, having the 

 appearance of being deformed by the impressed or constricted middle of the whorl. 

 The bulging of the shoulder immediately below the suture has a corresponding 

 thickening within. The outer lip is very much incurved above the middle of the 

 whorl at the impressed portion of it. The aperture is nearly one-third the length of 

 the shell. 



GONIOBASIS ATERINA. PI. 23, fig. 42. 



Testa Isevi, subfusiformi, atra vel virido-atra, crassiuscula ; spira obtusa ; suturis regulariter impressis ; 

 anfractibus senis, convexiusoulis ; apertura subgrandi, subovata, intus purpurea, aliquanto albida j 

 labro acuto, vix sinuoso ; columella infiecta, purpurea, incrassata et contorta. 



Shell smooth, subfusiform, black or greenish black, rather thick ; spire obtuse ; 

 sutures regularly impressed ; whorls six, somewhat convex ; aperture rather large, 

 subovate, purple within, somewhat whitish ; outer lip acute, scarcely sinuous ; 

 columella bent in, purple, thickened and twisted. 



Operculum ovate, reddish brown, thin and delicate, with the polar point near the 

 left edge above the base. 



Proc. Acad. Nat. Sci., 1863, p. 155. 



Bob. — Gap Spring, Cumberland Gap, and Rogers' Spring, west of Fincastle, East 

 Tennessee, Major S. S. Lyon, U. S. A. 

 My cabinet and cabinet of Major Lyon. 



