178 BULLETIN OF THE 



It will be remembered that Fischer considers Prophysaon a subgenus of 

 A nade7ius. 



The geographical distribution of Anadenus would seem to preclude its being 

 found in California, but to that genus only can J refer the species whose de- 

 scription here follows. 



Anadenus Cockerelli, Hemphill. 



Plate I. Fig. 1 ; Plate III. Fig. 5. 



Length (contracted) 13^ mm. ; mantle, length 4^, breadth 2| mm. End of 

 mantle to end of body, 8 mm. Foot, breadth 2 mm. Foot with the locomotive 

 disk, being distinctly differentiated into median and lateral tracts. Respira- 

 tory orifice slightly posterior on right side of mantle. Genital orifice below 

 right tentacle. No caudal mucus pore. Locomotive disk about half as wide 

 as either lateral area. Sides of foot wrinkled, but not differentiated from 

 lateral areas, nor specially marked, the wrinkles being a continuation of the 

 transverse grooves of the lateral areas. Mantle tuberculate-rugose, oval in 

 outline, bluntly rounded at either end ; not grooved as in Amalia. Mantle 

 free in front as far as respiratory orifice. Back rather bluntly keeled its 

 whole length ; rugae rather flattened and obscure, consisting of grooves en- 

 closing mostly hexagonal lozenge-shaped spaces, which are themselves rugose. 

 Color uniform brown-black, without markings, except some dark marbling on 

 the lighter sides. The portion beneath and in front of the mantle is pale, and 

 the head and neck have a gray tinge. Foot brown. Shell internal, thinnish, 

 white, oval in outline. Stomach large, swollen, broad. Liver pale ochrey. 



Anadenus Cockerelli, Hemphill, The Nautilus, Vol. IV. No. 1, May, 1890, p. 2. 

 Anadenulus, Cockerell, Ann. Mag. Nat. Hist., Oct., 1890, p. 279. 



Cuyamaca Mountains of San Diego Co., California. Mr. Henry Hemphill. 



Jaw low, wide, slightly arcuate, ends blunt, anterior surface with about 

 twenty wide, flat ribs, squarely denticulating either margin. (Plate III. 

 Fig. 5.) 



Lingual membrane short and narrow. Teeth 20-1-20, of which eight only 

 on either side are laterals. Centrals tricuspid, laterals bicuspid, marginals 

 quadrate, bluntly bicuspid. (Same Plate.) 



Prophysaon Hemphilli. 



From Portland, Oregon, Mr. Hemphill brought seventy-seven individuals of 

 a slug which may prove a variety of P. Hemphilli. They have the tawny color 

 of fiamm. The internal shell is so delicate, it is impossible to remove it 

 without breaking it. The penis sac is as in P. Hemphilli. The mantle is 

 sometimes smooth, sometimes tubevculate; its fuscous lateral bands are some- 

 times united by a transverse posterior band. Some of the individuals had the 

 tail constricted preparatory to excision. (See below, under Phenacarion.) 



