MUSEUM OF COMPARATIVE ZOOLOGY. 211 



Prophysaon humile, Cock ere ll. 



Plate VII. Figs. F, G, I., M. 



From Nautilus, 1890, p. 112. 



Length (in alcohol), 16£ mm. Body above and mantle smoke-color, obscured 

 by bands. Mantle wrinkled, and having a broad dorsal and two lateral blackish 

 bands, reducing the ground-color to two obscure pale subdorsal bands. Length of 

 mantle, 7 mm. ; breadth, 5^ mm. Respiratory orifice 2| mm. from anterior border. 

 Body subcylindrical, somewhat tapering, rather blunt at end. Distance from pos- 

 terior end of mantle to end of body, 8 nun. Back with a blackish band reaching a 

 little more than half its length, and lateral darker blackish bands reaching its 

 whole length. Reticulations distinct, "foliated." Sole strongly transversely striate- 

 grooved, but not differentiated into tracts. 



Jaw pale, strongly striate, moderately curved, not ribbed. (See Fig. F.) Lingual 

 membrane long and narrow. Teeth about 35-1-35. Centrals tricuspid, laterals 

 bicuspid, marginals with a large inner point, and one (sometimes two) small outer 

 points. Liver pale chocolate. 



Found by Mr. H. F. Wickham under the bark of rotten logs in the woods around 

 Lake Cceur d'Alene, Idaho, 1889. 



In its reticulations, and general external characters, this species resembles 

 P. Andersoni, of which it is possibly a variety. 



Hemphillia glandulosa. 



(See also p. 216.) 



From Olympia and Gray's Harbor, Washington, Mr. Hemphill sent me liv- 

 ing specimens of this species, both young and mature. Several of the young 

 had the horn-shaped process to the tail noticed in the original description of 

 the genus. The shell in these young individuals is very slightly attached, ap- 

 parently simply by having its posterior margin lightly covered by the mantle. 

 It often becomes detached. In these young, the mantle is proportionally 

 smaller, and the neck much longer. I have figured an enlarged view of a 

 young individual, Plate IV. Fig. D. 



Ariolimax l Columbianus, Gould. 



Found also by Mr. Hemphill on Santa Cruz Island. 



Plate VI. Fig. A, represents the mottled variety, found recently b/ Mr. 

 Hemphill in the State of Washington. Mr. Cockerell suggests for it the vari- 

 etal name maculatus. This form shares with the type the peculiar penis sac 

 (Fig. G) distinguishing it from the next species. 



Ariolimax Californicus, Cooper. 



See Plate V. Fig. E, for the animal in motion, and a portion of the genital 

 system (Fig. H), showing variation from that of A. Columbianus. 



1 The name should .be Arionilimax. 



