248 ARIOLTMAX, HEMPHTLLTA. 



Arion foliolatus, Gould, but is much smaller. It differs from 

 Prophysaon in having a mucous pore, yet is otherwise so closely 

 related in its general features to P. Eemphilli, that it is doubtful 

 whether they will not need to be united. Dr. Cooper writes of 

 Prophysaon : " The authors remark that they had only compared 

 alcoholic specimens with my description and figure of Arion 

 Andersoni. I have compared their description and figure with 

 alcoholic specimens of my species, and find that the differences 

 mentioned by them are caused chiefly by the contraction 

 by the alcohol. The distinct locomotive disk, minute caudal 

 pore and position of the generative orifice, all become changed 

 as described by them. The jaw figured by them differs only 

 in being immature, and in some of the ridges being consoli- 

 dated, thus showing eight single and six double ones, making 

 twenty, as given by me. This difference, with other possible 

 distinctions in color in fresh specimens may be sufficient to 

 separate, their species. Mine is, however, of the same genus/' 

 According to this, Prophysaon would need to be united with 

 Ariolimax; yet Mr. Binney (Terr. Moll., v. 235) maintains 

 Prophysaon, and whilst admitting that specimens received from 

 Dr. Cooper as A. Andersoni, really belong to Prophysaon (but 

 distinct from P. Hemphilli), he describes and figures an Ario- 

 limax Andersoni, Cooper (fig. 58), which he says, if realty 

 generically different from Dr. Cooper's species, may take the 

 name of A. Andersoni, W. G. Binney. 



Genus HEMPHILLIA, Bland and Binney, 1872. 

 H. GLANDULOSA, Bl. and Binn. PL 45, figs. 27, 28. 



Animal from 12 to 30 mill, long (preserved in alcohol); smoky 

 white, mottled with longitudinal dark-brown blotches, running 

 obliquely from the edge of the mantle to the foot, uniformly 

 with the coarse granulations, of which there are about twenty- 

 five on either side of the animal. Caudal process very large, 

 triangular in profile, dark brown, with a few coarse granulations. 



Shell unguiform, slightty convex, light horn-color, very thin, 

 its edges almost membranous, with prominent concentric lines 

 of growth. 



Length 5 mill., width 3 mill., in an animal of 12 mill, length. 



Astoria, Oregon. 



