AMNICOLA. 



83 



Fig. 164. 



Amnicola 

 2>orata. 



labium equally rounded, meeting above in a subacute angle ; tbe upper 

 edge of the latter appressed to the preceding whirl ; umbilicus 

 very distinct. 



Inhabits Cayuga Lake. Cabinet of the Academy. 



This species, which was found by Mr. Jessup, is rather larger 

 and more globose than P. limosa, to which it is allied, and has a 

 more distinct umbilicus. It resembles P. decipiens of Ferus- 

 sac, but is much less acute, and rather smaller. (Say.) 



Paludma porata, Say, Jonrn. Acad, N. Sc. Phila. 11,174(1821) ; 



Binney's ed. p. 69. — Kuster in Chemn. ed. 2 p. 63, pi. xii, f. 4, 5. — 

 Philippi Abbild. 11, t. II, f. 10 (1846), not Adams ( = /«s///c«). 



Amnicola porata, Haldeman, Mon, p. 13, pi. i, f. 8 (1844), not of Godld, 

 Inv., LiNSLEY, Pkescott, Mighels, Adams, &c. (=: limosa). — De Kay, 

 N. Y. Moll. p. 8S, pi. XXXV, f. 333 (1843).— Che.nu, Man. de Conch. 

 II, 308 ; fig. 2194. 



Big Sioux River and Moose Factory are the oulj other locali- 

 ties of which I have heard. 



Amnicola pallida, Hald. — Shell thin in texture, conical, rather 

 robust, composed of four and a half convex whirls, separated by a well 

 marked suture ; spire obtuse, rather longer than the aperture ; umbilicus 

 narrow ; aperture ovate-orbicular, forming an angle posteriorly ; 

 a small portion of the labium confluent with the body whirl pig. 165. 

 posteriorly. 



Color pale ochraceous, translucent. 



Inhabits Lake Champlain. — Prof. Adams. 



Intermediate between lustrica and porata. It is not as short . . , 

 and transverse as the former, which, moreover, is widely um- pallida. 

 bilicate, and has the aperture regularly rounded posteriorly. 

 According to the description of Professor Adams, the labium sometimes 

 scarcely touches the body of the shell. The spire is comparatively longer 

 than in porata, the outline less transverse, and the aperture not orbicular. 

 (^Haldema7i.) 



Amnicola pallida, Haldeman, Mon. pt. 4, p. 3 and 4 of wrapper (1842) ; 



Mon. p. 12, pi. i, f. 7 (1844?). 

 Amnicola lustrica, Adams, Thompson's Vermont, 169, 152 (1842), teste 



Haldeman. 



