117 



1617 Anadenus cockerelli H. Hemphill. 



"Length contracted in alcohol 13.5 mm. Mantle 4.5 long, 

 2.75 wide. End of mantle to end of body 8. Foot 2 wide. Foot 

 with a locomotive disk, being distinctly differentiated into me- 

 dian and lateral tracts. Respiratory orifice slightly posterior, on 

 right edge of mantle. Genital orifice below right tentacle. No 

 caudal mucus pore. Locomotive disk narrow, only half the width 

 of the lateral areas. 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. Man- 

 tle 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; 

 ruga? rather flattened and obtuse, consisting of grooves inclosing 

 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. Internal shell solid, easily extricated 

 without breaking. Jaw wide, slightly acuate, ends blunt, anterior 

 surface with about 20 wide flat ribs, squarely denticulating either 

 margin. Lingual membrane short and narrow. Teeth 20-1-20, of 

 which 8 only on either side are laterals. Centrals tricuspid, lat- 

 erals bicuspid, marginals quadrate, bluntly bicuspid." — Henry 

 Hemphill, Nautilus 4:2 (May 1890). 



Type locality: — Cuyamaca Mts., San Diego, Cal. 



1618 Genus Prophysaon 



1619 Raymond, W. J.: 



Why does Prophysaon shed its tail? Nautilus 4:6. 



1620 Wood, Williard M.: 



On a collecting trip to Monterey bay. Nautilus 7:70. 



1621 Monks, Sarah P.: 



San Pedro as a collecting ground. Nautilus 7:74. 



1622 Taylor, George W. : 



Land and fresh water shells in the Rocky Mountains. Nau- 

 tilus 7:85. 



These faunal lists and notes will be useful to those wishing to 

 pursue special studies, and are thus noted for the convenience of 

 the student. 



1623 Taylor, George W,: 



Notes on a collecting trip to Departure bay, Vancouver Island. 

 Nautilus 7:100. 



1624 Raymond, W. J.: 



The California species of the genus Nuttallina. Nautilus 7: 

 133. Discusses distribution of N: Calif ornica Nutt. and N: scabra 

 Reeve. 



1625 Mactra catilliformis Dall. 



Shell large, thin, whitish or straw color, irregularly concen- 

 trically striated, with a gray, wrinkled epidermis, inflated short- 

 oval subequilateral valves and closely adjacent inconspicuous 

 beaks; anterior end of shell evenly rounded in front, a little 

 shorter than the posterior end; lunule narrow, impressed, escutch- 



