OF CONCHOLOGY. 219 



DECRIPTIONS OF NEW SPECIES OE AMNICOLA 



POMATIOPSIS, SOMATOGYBUS QABBIA, 



HYDEOBIA AND BISSOA. 



BY GEORGE W. TRYON, JR. 



1. Amnicola turbiniformis, Tryon. — t. 22, f. 5. 



Description. — Shell ovate, turbinated, whorls very convex; 

 sutures impressed, spire obtuse at apex; nearly four whorls; 

 body large, well rounded, a little angulated on the periphery ; 

 aperture wide ovate; umbilical opening narrow. Color dark 

 green, light blue within the aperture. 



Dimensions. — Length "ISS inch, diameter "125 inch; length 

 of aperture '066 inch, diameter '055 inch. 



Habitat. — Crane Lake Valley, and Surprise Valley, N. E. 

 California; and W. side of Stein's Mountains, S. Oregon. Wm. 

 M. Gabb. 



My Cabinet. Cabinet of Mr. Gabb. 



Observations. — This small species resembles A. Cincinnatien- 

 sis, Anth., very much in general appearance. The principal 

 points of difference are, that this is a smaller, more solid spe- 

 cies, with rather shorter spire, smaller umbilicus, and darker 

 color ; it differs also in the slightly angled periphery. 



Mr. Gabb sent me a large number of specimens from the 

 above localities. 



2. Amnicola similis, Tryon. — t. 22, f. 6. 



Description. — Shell ovately turbinated, whorls four, convex, 

 spire moderate, apes obtuse, sutures well marked ; body whorl 

 well rounded, aperture ovate or pear-shaped, umbilicus mode- 

 rately wide. Light horn color. 



Dimensions. — Length -135 inch, diameter -120 inch; length 

 of aperture -Q inch, breadth '42 inch. 



Habitat. — Manilla. Wesley Newcomb, M. D. 



My Cabinet. Cabinet of Dr. Newcomb. 



Observations. — This shell resembles A. turbiniformis^ herein 

 described, but has a rather shorter, more obtuse spire, narrower 

 aperture, and wider umbilicus. 



