Jaw and Lingual Dentition of Pulmonata. 181 



Orthalicus undatus, Brug. Var. 

 Key West. W. W. Calkins. 



This is the form figured as 0. zebra, Mull., in Terr. 

 Moll. U. S., IV, pl.'lxxviii, fig. 12, and L. & Fr. W. 

 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 

 Biscay ne. 



Mr. Calkins kindly sent me specimens preserved in spirits. The gen- 

 italia are like those of the typical 0. undatus, from Jamaica (see Ann. 

 N. Y. Lye, N. H., XI, 41). So also is the jaw. 



The lingual dentition I have figured on pi. 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 undatus (see Proc. Ac. Nat. Sc. Phila., 1875, pi. vi, fig. D). 



Ariolimax Hemphilli (n. sp). 



From Mr. Henry Hemphill I have received specimens of an 

 undescribed species of Ariolimax, 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 

 (pi. xii, fig. 7). The testicle (t.) embedded in the liver, is brown, com- 

 posed of thickly packed fasciculi of long, blunt cceca, 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 farther end. Oppo- 

 site the mouth of the penis sac the vagina is greatly swollen. 



A comparison with my figures of the genitalia of A. Andersoni? (pi. 

 xii, fig. 9), and A. Columbianus, Califomicus and niger (Phila. Proc, 1874, 

 pi. 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 (pi. xviii, fig. H) as usual iu the genus (see Phila. 

 Proc, 1875, 193). Teeth 31 - 1 - 31. 



