176 AMERICAN JOURNAL 



From the descriptions of this and the preceding membrane, 

 it will be seen that both species have the lingual dentition of the 

 ffelieince, and not of the Vitrinince, in which they are placed by 

 Albers and v. Martens. 



The marginals which characterize the Vitrinince are wanting in 

 both species, their place being supplied by marginal teeth of the 

 form common to the genera Helix, Bulimulus, &c. 



Several specimens collected in Jamaica by, and received from, 

 Messrs. Gloyne and Vendryes, 



S. Haldemaniana is viviparous. 

 Patula solitaria, Say. 



Jaw long, low, slightly arcuate, ends but little attenuated ; 

 anterior surface striate, but without ribs. 



Teeth about 40 — 1 — 40, as usual in the genus ; the marginal 

 teeth broad and short, with one long, blunt denticle, and several 

 side short, small, blunt denticles. 



Helix Yatesii, J. G-. Cooper, not of Pfeiffer. 



Jaw slightly arcuate, ends blunt; anterior surface with nu- 

 merous broad ribs. 



Lingual membrane as usual in the genus ; centrals tricus- 

 pid, laterals bicuspid ; marginals with two stout, oblique denti- 

 cles, the inner one the longer. 



Living specimens received from Dr. W. Newcomb. 



This species is allied to H. nautiliformis, Porro, which is placed 

 by Albers and v. Martens in Section a of G-onostoma, Held., as 

 equivalent to Drepanostoma, Porro. 



Helix fastigans, L. W. Say. (Polyyiira.) 



Jaw slightly arcuate, long, low, with about twenty ribs on the 

 anterior surface, crenellating either margin. 



Lingual membrane long and narrow ; teeth as usual in the 

 genus ; centrals tricuspid, laterals bicuspid ; marginals wide, low, 

 with long, slender, acute denticles as in H. auricidata. (See fig. 

 158, p. 87, Land and Fresh Water Shells of N. Amer., Part I.) 



Helix similaris, Ferussac. (Dorcasia.) 



Jaw arched, of equal height throughout ; ends blunt ; with 

 eight widely separated, well defined ribs crenellating either 

 margin. 



Lingual membrane long and broad ; centrals tricuspid, later- 

 als bicuspid ; marginals long, low, irregularly denticulated, 

 denticles long, oblique, usually one inner, long, and one outer, 

 short, both bifurcate. 



Specimen from Brazil, collected by Mr. J. G. Anthony. 



