PACIFIC COAST SPECIES. 103 



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

 Andersoni, J. G. C, I am iucliued to refer the specimens to one of those 

 species. I am entirely uu acquainted with the first (see below, under 

 locally introduced species) ; the second is generally distinct ; the latter 

 may be identical.* The specimens have all the characters of Ariolimax. 

 They are about 35™°' long. 



ArioUviax Andersoni? see W. G. Binney, Ann. Lye. Nat. Hist, of N. Y., xi, 182, pi. xli, 

 fig. 9(1875); Terr. Moll., V, 235. 



The jaw is, as usual in the genus, wide, low, with about thirteen 

 broad, separated ribs, deuticulating either margiu. The lingual mem- 

 brane is as usual. Teeth, 48-1-48. The characters of the teeth are 

 sufficiently shown in my Fig. G of Plate V, Terr. Moll., Y. The change 

 from laterals to marginals is very gradual, the latter being but a simple 

 modification of the former. 



The genitalia (Plate XII, Fig. E, Terr. Moll., V) are very much like 

 those oi A. niger, especially in the shape of the iienis sac and the pecul- 

 iar accessory organ {p, g), probably a vaginal i)rostate. fic^ct. 

 The genital bladder differs somewhat in shape, and also the 

 testicle. 



The rudimentary shell has decided concentric layers. ^ , , 



Caudal pore of 



The caudal mucus pore is as in J.. Columbiamis. ^- ^^'^ersoni. 



Should this not prove the species described as Avion Andersoni by 

 Dr. J. G. Cooper, it must receive a new name. It is a true Ariolimax^ 

 most nearly related to A. niger. The latter species wants the foliated 

 reticulations, and has its posterior termination more blunt, with a de- 

 cided transverse cleft at the mucus pore. 



DOUBTFUL SPECIES OF ARIOLIMAX. 



In " Some Notes on American Laud Shells," p. 6, Professor Wetherby 

 mentions by name, without description, another species, A. Hecoxi. 

 The genitalia examined by me prove the species to be distinct from any 

 described. There are about CO-1-60 teeth on the lingual membrane, 

 with about 16 laterals on each side. 



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

 mens agreeing perfectly with the form of Provhysaon referred to as probably nude- 

 scribed on p. 296, Plate XIII, Fig. 5, of Ann. of Lye. of N. H. of N. Y., Vol. X. 

 Should Dr. Cooper's 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 Ander- 

 soni. (Seep. 106.) 



