182 Jaw and Lingual Dentition of Pulmonata. 



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 Avion 

 foliolatus, Gld., Prophysaon Hemphilli, Bl. & Binn., and 

 Avion Andevsoni, J. G. C, I am inclined to refer the spec- 

 imens to one of those species. I am entirely unacquainted 

 with the first (see Ann. N. Y. Lye. N. H.,X, 297), the 

 second is generically distinct, the latter may be identical.* 

 The specimens have all the characters of Ariolimax (see 

 Proc. Ac. Nat. Sc. of Phila., 1874, 33). They are about 

 35 mill. Ions:. 



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 (pi. xii, fig. 9) are very much like those of A. niger (see 

 Phila. Proc. 1. c, pi. 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. c, pi. ii, fig. B). 



Should this not prove the species described as Avion 

 Andevsoni by Dr. J. G. Cooper, it must receive a new name. 

 It is a true Aviolimax, most nearly related to A. nigev. The 

 latter species wants the foliated reticulations, and has its 

 posterior termination more blunt, with a decided lateral cleft 

 at the mucus pore. 



*I have lately received from Dr. Cooper, under the name of Avion Andersoni, spec- 

 imens agreeing perfectly with the form of Prophysaon referred to as probably unde- 

 6cribed on p. 29G, and pi xiii, fig. 5, of Ann. of Lye. of N. H. of N. Y., vol. X. Should 

 Dr. Cooper's Avion Andersoni prove, therefore, to be a Prophysaon, it will retain its 

 specific name, while the 6lug before us may also retain the specific name Andersoni. 



