181 Jaw and Lingual Dentition of Pulmonata. 
Orthalicus undatus, Brug. Var. 
Key West. W. W. Calkins. 
This is the form figured as O. zebra, Mull, mm Terr: 
Moll. U...S., 0V ple Ixxviny he. 912) andy coir We 
Sh. N. A., I. p. 216, fig. 370 (not fig. 371). It has also 
been found on Indian Key, Sandy Key, Cape Sable and Key 
Biscayne. 
Mr. Calkins kindly sent me specimens preserved in spirits. The gen- 
italia are like those of the typical O. wndatus, from Jamaica (see Ann. 
N. Y. Lyc., N. H., XI, 41). So also is the jaw. 
The lingual dentition I have figured on pl. xiii, fig. E, giving one cen- 
tral with its adjacent lateral, and one marginal tooth. There are 126-1 
-126 teeth. The cutting points are somewhat more developed than in 
the typical wndatus (see Proc. Ac. Nat. Sc. Phila., 1875, pl. vi, fig. D). 
Ariolimax Hemphilli (n. sp). 
From Mr. Henry Hemphill I have received specimens of an 
undescribed species of Arvolimax, collected by him. at 
Niles Station, Alameda Co., California. 
It is from 25-31 mill. long, of a transparent flesh color, much more 
slender than the other known species, with a much more pointed tail. 
The mantle is also longer. These characters, even in specimens pre- 
served in alcohol, readily distinguish the species. On dissecting the 
specimens, I also found distinguishing specific characters in the genitalia 
(pl. xii, fig. 7). The testicle (t.) embedded in the liver, is brown, com- 
posed of thickly packed fasciculi of long, blunt coeca, the mass formed 
by them is cuneiform. The ovary (ov.) is narrow and pointed. The gen- 
ital bladder (g. b.) is small, oval, with a short, narrow duct, which be- 
comes much more swollen at its junction with the vagina. The penis 
sac (p. s.) is extremely short, globular, receiving the vas deferens at its 
upper posterior portion, and the retractor muscle at its fartherend. Oppo- 
site the mouth of the penis sac the vagina is greatly swollen. 
A comparison with my figures of the genitalia of A. Andersoni ? (pl. 
xii, fig. 9), and A. Columbianus, Californicus and niger (Phila. Proc., 1874, 
pl. ii and xi), will show how widely they differ from those of the present 
species. 
The jaw is thick, low, wide, slightly arcuate, ends scarcely attenuated; 
anterior surface with 8-12 decided ribs, denticulating either margin. 
Lingual membrane (pl. xviii, fig. H) as usual in the genus (see Phila. 
Proc., 1875, 193). Teeth 31-1-31. 
