pm Wi 
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; 
ruge 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. 
———0 
1624 Raymond, W. J.: 
The California species of the genus Nuttallina. Nautilus 7: 
pe Discusses distribution of N: Californica Nutt. and N: scabra 
eeve. 
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- 
