78 THE NAUTILUS. 
a. Jaw Tibbed, ... +... .meeee ee. - - > 2 ejesee 
b. Jaw only striate,, . . P. humile. (Until more material 
of humile is seen, it cannot be made sure that the jaw-character is a 
specific one.) 
My present opinion is that Phenacarion must be merged in Pro- 
physaon s. str. 
In order to further elucidate some of the forms of Prophysaon, I 
give below some of my notes, made vears ago, but not published at 
the time. 
Prophysaon hemphilli W.G. Binney (as Phenacarion). 
This must not be confounded with P. hemphilli B. and B., which 
I consider specifically identical with andersoni. I know little more 
about it than may be gathered from Mr. Binney’s account. Mr. 
Binney sent me one from near the mouth of the Chehalis River, and 
I noted at the time: looks like type foliolatus in alcohol. Sole pale 
yellowish white. Edge of foot dark, with darker transverse lines. 
Body bluish-gray, tapering; mantle more brownish. 
Prophysaon foliolatum (Arion foliolatus Gld.). 
Comparing this with P. hemphilli B. & B., I noted :—Sole white, 
oblique transverse grooves visible. Transverse dark streaks on 
edge of sole more strongly marked, alternating strong and weak 
Body exactly the same color (in aleohol) as hemphilli B.& B. Pale 
dorsal line very slightly indicated. Reticulations practically as in 
hemphilli, but foliations more distinct. Mantle not so dark and 
brownish-tinged ; bands represented by subcoalesced black marks; 
black spots scattered about. As I wrote in An. Mag. N. Hist., 1890, 
“it is most difficult to separate P. foliolatum and Proph. hemphilli 
(i. e. andersont) specifically.” An alcoholic example of hemphilli 
differed from foliolatum as under— 
Prophysaon hemphilli B. & B. 
Sole slightly yellowish, only wrinkled transversely. Marks on 
edge of sole quite similar, but not so well marked. Body purplish 
mouse-color, i. e., gray with a lilac tinge. Mantle dark, with indis- 
tinct “smoke colored band.” Body tapering. No mucus pore. A 
pale dorsal line is barely indicated just behind mantle to half length 
of back. Slug 42 mm. long. 
