AMERICAN JOURNAL 



DESCRIPTIONS OP NEW EXOTIC FRESH-WATER 

 MOLLUSCA. 



BY GEORGE W. TRYON, JR. 



1. Vivipara suprafasciata, Tryon. — t. 2, f. 7. 



Description. — Globose-conic, inflated, rather thin; spire ele- 

 vated-conic, suture deeply impressed; whorls 5, very convex, 

 the last large, with very fine growth- lines, obsolete revolving 

 lines and slight malleations; umbilicus small, the shell sub 

 angular around it ; aperture obliquely oval. Eather a bril- 

 liant green, with the spire, and body whorl above the aperture, 

 traversed by dark green narrow bands, five or six in number, 

 which are disposed to be alternately narrower. 



Dimensions. — Length 25 mill., diam. 20 mill. 



Habitat. — Tropical Australia. 



My Cabinet. Cabinet of the Academy of Natural Sciences, 

 Philadelphia. 



Observations. — This species in the general form reminds 

 one of V. contecta, Millet, or of V. intertexta, Say. From V. 

 Australis, Reeve, it is easily distinguished. That species is 

 narrower, appressed above, with only a few distant brown 

 lines, and the whorls are not so globose. It does not answer 

 at all to the description of V. Waterhousei, recently described 

 from Australia. 



2. Hemisinus Binneyi, Tryon. — t. 2, f. 8. 



Description. — Shell ovate, somewhat thin; spire moderately 

 elevated, apex obtuse, suture well impressed; whorls 5, a little 

 convex, the last large, smooth; aperture more than half the 

 length of the shell, angulate above and below, columella 

 curved, slightly notched at the base. Bright olive, with four 

 darker bands, of which the second is widest, and about fifteen 

 revolving rows of small, numerous, transverse dark red dots; 

 bands red within the aperture. 



Dimensions. — Length 13 mill., diam. 7 mill. 



