60 



LAND AND FRESH-WATER SHELLS OF N. A. PART IIL 



/7— ^ 



Lingual deutition oi Lioplax suljcarinata. 



Fig. 124. The lingual dentition of Lio- 



plax suhcarinata is thus figured 

 b3^Troschel(Fig. 124). There 

 are seven teeth in each row, 

 with recurved, simple, acute 

 apices, the central broad at the 



base, narrower above, the laterals narrower. For the animal see 



p. 55. 



Doubtful, Spurious, and Extra-limital Species op 



TiVIPARIDjtE. 



This completes the list of known North American Vhiparidse. 

 There now follow notices of doubtful species and those which 

 have been erroneously referred to the genus. 



In the Trans. Lit. and Hist. Soc. Quebec, I, 19G, occur the two following 

 descriptions by Mrs. Sliepard : — 



Paludina . — Shell white ; epidermis olive ; spire the length of 



the aperture ; last whirl inflated. Island of Orleans. 



Paludina . — Shell pale buff; spire longer than the aperture ; top 



obtuse. Found with the foregoing on the beach at the ish^nd ; the 

 whirls are not so much inflated as those of this genus generally 

 are, but I think it would not range under any other; it has bluish 

 bands of gray round the top of the whirls. 



Paludina aJIe(jhanens!s, Green. — Shell conical ; spire elevated and rather 

 obtuse ; whirls four, rounded and nearly smooth, the ultimate whirl 

 the largest ; mouth oval, slightly angular near the upper part of 

 the peristome, where it adheres to the body whirl; umbilicus none: 

 epidermis dark brown color. Length two-tenths of an inch. Fine 

 specimens of the shell are in the cabinet of Mr. W. Hyde. Moun- 

 tains of Pennsylvania. {Green.) 



Paludina alleyhanenais, Gkeen, in Doughty's Cabinet of Nat. Hiist., 

 II, p. 291 (1832). 

 The above is Green's description. I have not been able to obtain 

 any information about the species. From the size and shape of 

 the shell I should incline to believe it to be an Amnicola. 



