173 Jaw and Lingual Dentition of Pulmonata. 
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 dentition. 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, however, more pointed. 
This species is viviparous. 
Helix dentiens, Fér. (Dentellaria). 
See Proc. Ac. Nat. Sc. Phila., 1874, p. 57. I now offer fig. G of pl. 
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 383 is the last. 
Helix aspera, Fér. ( Thelidomus). 
Jamaica. Mr. V. P. Parkhurst to Mr. T. Bland. 
For jaw and lingual membrane see Amer. Journ. Conch. VI, 204. 
Pl. 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. XI, 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 
(pl. xiv, fig. B). 
Jaw thick, arcuate, ends attenuated: anterior surface with 14 decided 
but unequal, irregularly disposed ribs, denticulating either margin. 
Genitalia figured on pl. 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. 
