Jaw and Lingual Dentition of Pulmonata. 182 
Ariolimax Andersoni, J. G. Coop.? 
From Mr. L. G. Yates I have received specimens of an 
Ariolimax found in the mountains of Alameda Co., Cali- 
fornia. From the fact of the reticulations of the surface of 
the animal having the foliated appearance noticed in Arion 
Soliolatus, Gld., Prophysaon Hemphilli, Bl. & Binn.,. and 
Arion Andersoni, J. G. C., Iam inclined to refer the spec- 
imens to one of those species. I am entirely unacquainted 
wath the first (see Ann. N. Y¥. Lye. N. H., X, 297), the 
second is generically distinct, thé latter may be identical.* 
The specimens have all the characters of Ardolimax (see 
Proc. Ac. Nat. Sc. of Phila., 1874, 33). They are about 
35 mill. long. | 
The jaw is as usual in the genus, wide, low, with about 13 broad,. sep- 
arated ribs, denticulating either margin. The lingual membrane is as 
usual. Teeth 48-1-48. The characters of the teeth are sufficiently 
shown in my fig. G, of plate xii. The change from laterals to marginals is 
very gradual (43), the latter being but a simple modification of the former. 
The genitalia (pl. xii, fig. 9) are very much like those of A. niger (see 
Phila. Proc..1. c., pl. xi, fig. C), especially in the shape of the penis-sac, 
and the peculiar accessory organ (v. p.), probably a vaginal prostate. 
The genital bladder differs somewhat in shape, and also the testicle. 
The rudimentary shell has decided concentric layers. The caudal 
mucus pore is as in A. Columbianus (Phila. Proc. 1. ¢., pl. ii, fig. B). 
Should this not prove the species described as Arion 
Andersoni by Dr. J. G. Cooper, it must reeeive a new name. 
It isa true Arvolimax, most nearly related to_A. niger. The 
latter species wants the foliated reticulations, and has its 
posterior termination more blunt, with a decided lateral cleft 
at the mucus pore. | 
*T have lately received from Dr..Cooper, under the name of Arion Andersoni, spec- 
imens agreeing perfectly with the form of Prophysaon referred to as probably unde- 
scribed on p. 296, and pl. xiii, fig. 5, of Ann. of Lyc. of N. H. of N. Y., vol. X. Should 
Dr. Coopers Arion Andersoni prove, therefore, to be'a Prophysaon, it will retain its 
specific name, while the slug before us may also retain the specific name Andersoni. 
(2) 
