MUSEUM OF COMPARATIVE ZOOLOGY. 179 



Prophysaon Andersoni, J. G. Coopeb. 



3d Suppl., Plate III. Fig. 1? Plate VII. Fig. C; Plate I. Fig. 3 (dentition); 

 Plate IX. Figs. I, J (enlarged surface). 



Shield strongly granular-rugose, the respiratory orifice nearly median on its 

 right margin ; tail acute, with small gland ; reddish gray, the body somewhat 

 clouded with black, the shield paler, clouded, or more usually with a dark 

 band on each side above the respiratory orifice, converging in an elliptic form ; 

 a pale dorsal streak ; head uniform pale brown, tentacles darker ; foot and 

 often the mantle tinged with olive. Length 2.5 inches (Cooper). 



Arion Andersoni, J. G. Coopeb, Proo. Phila. Ac. Nat. Sci., Plate III. Fig. F. 

 Prophysaon Andersoni, J. G. Coopeb, Pr. Amer. Phil. Soc, 1879, p. 288. 

 Prophysaon Andersoni, W. G. Binney, Terr. Moll. V., 3d Suppl., Plate III. Fig. 



1 ? PI. VII. Fig. C ; Plate I. Fig. 3 (dentition) ; Plate IX. Figs. I, J 



(surface). 



A species of the Pacific Province, Straits of De Fuca to Oakland, California. 



The characteristic of this species is the light dorsal band, which is not 

 present in P. Hemphilli. It has the broad vagina, stout, short, cylindri- 

 cal penis sac, and genital bladder of P. Hemphilli, as well as the foliated 

 reticulations. 



In the many living and alcoholic specimens which I have examined, I have 

 failed to detect any appearance of a caudal mucus pore, which Dr. Cooper is 

 confident of having observed, excepting in eight individuals out of thirty col- 

 lected by Mr. Hemphill on San Juan Island. 



Many individuals examined by me are excided as described under Phena- 

 carion foliolatus. 



Figure 1 of Plate III. of 3d Suppl. was drawn from a specimen received from 

 Dr. Cooper. It represents the true Andersoni, distinguished by a light dorsal 

 band, and by genitalia such as I have described for P. Hemphilli. The same 

 form, also received from Dr. Cooper, is drawn by Mr. Cockerell on Plate VII. 

 Fig. C. Mr. Cockerell has shown me that 1 have confounded with it another 

 species, which he proposes to call P. fasciatum. See next species. 



Specimens collected by Mr. Hemphill at Old Mission, Coeur d'Alene, Idaho, 

 appear to agree with specimens of this species received from Dr. Cooper. 

 The jaw is low, wide, slightly arcuate, with over 12 broad, stout ribs, deuticu- 

 lating either margin. The lingual membrane is given in Plate II. Fig. 2, of 

 3d Suppl. The central and lateral teeth are slender and graceful. The latter 

 have, apparently, a second inner cutting point, as is found in Limax agrestis. 

 I have so figured it, hoping to draw attention to it, and thus settle the question 

 of its being there. On Plate IX. I have given enlarged views of the surface, 

 drawn by Mr. Arthur F. Gray. (See Explanation of Plate IX. Figs. I and J 

 of 3d Suppl.) 



