THE NAUTILUS. Ill 



NEW "WESTERN SLUGS. 



BY T. D. A. COCKERELL 



Prophysaon pacificum Cockeiell, n. sp. 



Length (in alcohol) ITJ mill. Body i^nd mantle ochery-brown, 

 head and neck gray. Mantle granulated, rather broad, with a black 

 band on each side not reaching the anterior border ; these bands are 

 furthest (2[ mill.) apart near the respiratory orifice, from which 

 point they converge posteriorly, and anteriorly by the bending of 

 the band on the right side. Length of mantle 71 mill., breadth 4 

 mill. Respiratory orifice 3] mill, from anterior border. Body 

 cylindrical, rounded and very blunt at end, not conspicuously taper- 

 ing. Distance from posterior end of mantle to end of body, 8 mill. 

 Body dark grayisli-ocbre above, with an indistinct pale dorsal line ; 

 sides j)aler. Reticulation distinct, with indistinct "foliations." Sole 

 somewhat transversely wrinkled, but not differentiated into tracts. 

 Jaw dark, strongly curved, blunt at ends, with about 10 well- 

 marked ribs. Lingual membrane, with about 35-1-35 teeth ; centrals 

 tricuspid, tlie side cusps very small, laterals bicuspid, marginals with 

 a large sharp straight point, and a small outer one. Compared with 

 P. humile the centrals are slightly shorter and broader. Liver dark 

 gray-brown. 



Found by Mr. H. F. Wickham under logs in ditches by the road- 

 side and damp places at Victoria, Vancouver Island, 1889. 



This is a very distinct species, easily recognized by its color, the 

 absence of dark bands on the body, the pale dorsal line, and the 

 blunt posterior extremity. 

 Prophysaon flavum Cockerell, n. sp. 



Length (in alcohol) 25 mill. Body and mantle dull ochreous, 

 head and neck ochreous. Mantle tuberculate-granulose, grayish- 

 ochre, pale at edges, and with black marbling or spots in place of the 

 bands oi P. pacificum. Length of mantle 11 mill, breadth ol mill. 

 Respiratory orifice 5 mill, from anterior border. Body cylindrical, 

 hardly tapering, and blunt at end. Distance from posterior end of 

 mantle to end of body, 14 mill. Body dark grayish-ochre above, 

 with a pale ochreous dorsal line not reaching much more than half 

 its length; sides paler. Reticulations distinct, "foliated." Sole 

 with well-marked transverse lines or jjrooves, those of either side 



