lU 



L.A.XD AND FRESH-WATER SHELLS OF X. A. [PART IL 



(limensions of A. rivularis. I separate it from this latter, chiefly on ac- 

 count of its solid, calcareous structure. I am indebted to Mr. I. Cozzens 

 for the specimens from the Passaic River, near Paterson, hut it will 

 doubtless be found in this State. {DeKay.) 



Ancylus calcarius, DeKay, N. Y. Moll. 13, pi. v, f. 99 a, b (1S43). 



Fig. 240 is copied from one of PeKay. 



Ancylus pattelloides, Lea. — Shell large, thick, elliptical, spot- 

 ted, obliquely conical ; strice 'minute, crowded ; apex sub- 

 medial. 



Arroya San Antonio, California : Dr. Trask. (Lea.) 



Ancylus pattelloides. Lea, Proc. Acad. Nat. Sc. Phila. 1856, 

 VIII, 80. 



Fig. 241. 



AncyltiS 

 jjattel- 

 loides. 



Fig. 241 is copied from Mr. Lea's original specimen. 

 The species seems nearest allied to A. crassus. 



Fig. 242. 



ABicylus kootanieiisis, Baikd. — Shell ovate, ashy, concentri- 

 cally striate, vertex anterior, obtuse, shining within. Length ^, breadth 

 I inch. 



Ilah. Rivers Kootanie and Spokane, British 

 Columbia. Brit. Mus. 



The shell is of an ovate form, and is con- 

 centrically striated, though the stride only 

 appear on the lower two-thirds of its surface, 

 the apex being smooth and shining. Inter- 

 nally the shell is shining and somewhat 

 pearly. (Bain I.) 



Ancylus kootaniensis, Baikd, Proc. Zool. Soc. 



Ancyltis Icootaniensis. 



London, 1863, 69. 



The above description is copied from the original. Fig. 242 

 is drawn from the advance plates of the Report of the 

 Fig. 243. British Boundary Commission. 



AiicylHs caiirinns. Cooper. 



Ancylus .rnuriniix. Cooper, in Reports on Nat. Hist., &c., of 

 Minnesota, Nebraska, Washington, &c., p. 378 (1859) ; 

 . P. R. R. XII, 378. 



Anryijltis 

 caurinus. 



