Jaw and Lingual Dentition of Pulmonata. 173 



wrinkles. One jaw had a slightly developed median projection to its cut- 

 ting edge, another has no approach to a projection. 



Plate xiv, fig. C, shows the lingual dentitiou. Teeth 69-1-69, 

 with about 22 laterals. There is considerable resemblance to the denti- 

 tion of H. fringilla herewith described. The cutting points on centrals 

 and laterals are, howevei*, more pointed. 



This species is viviparous. 



Helix dentiens, Fer. (Dentellaria). 



See Proc. Ac. Nat. Sc. Phila., 1874, p. 57. I now offer fig. G of pi. 

 xvi, to give more full details of the changes of the teeth from centrals to 

 marginals, especially the side cusp and cutting point of the outer laterals, 

 and the transition from laterals to marginals. Tooth 33 is the last. 



Helix aspera, Fer. (Thelidomus). 



Jamaica. Mr. V. P. Parkhurst to Mr. T. Bland. 



For jaw and lingual membrane see Amer. Journ. Conch. VI, 204. 

 PI. xii, fig. 2, represents the genital system. The genital bladder 

 (g. b.) is elongated oval, on a short, stout duct. The penis-sac (p. s.) 

 is stout, long, tapering bluntly to its apex, someway below which is the 

 entrance of the vas deferens. The retractor muscle is inserted at about 

 the middle of the length of the penis-sac. 



Helix Jamaicensis, Chemn. (Thelidomus). 

 Jamaica. Mr. V. P. Parkhurst to Mr. T. Bland. 



Mr. Bland has already called attention (Ann. Lye. N. H. 

 of N. Y. XIj 146, 1875) to the true subgeneric position 

 of this species. I propose here only to give a figure of the 

 dentition and genitalia. 



There are 41-1-41 teeth on the long and narrow lingual membrane 

 (pi. xiv, fig. B). 



Jaw thick, arcuate, ends attenuated : anterior surface with 14 decided 

 but unequal, irregularly disposed ribs, deuticulating either margin. 



Genitalia figured on pi. xiii, fig. F. The peculiarity of it is the ex- 

 tremely long epididymis (e), convoluted at either end. The penis-sac 

 has a contraction at its middle, below which it is black, above it, white. 



