108 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Range. San Diego, California, to San Martin Island, Lower Cali¬ 
fornia. 
Rissoina newcombei Dali, 1897 
Plate 83, fig. 7 
Bulletin of the Natural History Society of British Columbia , No. 2, 14; PI. 1, fig. 12. 
Shell small, thin, white, with six and a half whorls; nucleus trans¬ 
parent, polished, smooth; subsequent whorls with close-set, low, fine, 
slightly flexuous, transverse (or axial) riblets; suture distinct, somewhat 
appressed; aperture large, patulous, with the lips rather thickened. Long, 
of shell, 3; diameter, 1 mm. (Dali.) 
Type in ? Type locality, Cumshewa Inlet, British Columbia. 
Range. Forrester Island, Alaska, to Vancouver Island, British Co¬ 
lumbia. 
Family ANAPLOCAMIDAE 
Genus ANAPLOCAMUS Dali, 1895 
Shell short-spired, with a thick brown periostracum, with a simple, 
sharp, outer lip, parietal callus, arched pillar, the anterior extreme of the 
aperture slightly produced and pointed, as in some Litorinas; the base 
imperforate, the aperture destitute of lirae, teeth, or other projections; 
operculum, relatively to the size of the animal, large; area of attachment, 
small; form, U-shaped, the apex without any spiral inclination, rather 
blunt, the increment being applied to the proximal end, and the edges 
entire. (Dali.) 
Type. A. borealis Dali. 
Distribution. Northern. 
Anaplocamus borealis Dali, 1895 
See Part II, Plate 31, fig. 15 
Proceedings of the United States National Museum, 18:9 and 24:550; PI. 38, fig. 4. 
Shell short, rude, of about four and a half whorls (the apex in each 
specimen eroded), smooth, except for lines of growth and darker lines, 
which might indicate resting stages; whorls somewhat flattened above and 
near the apex, more or less appressed at the suture; periphery rounded, 
or, in the younger shells, obscurely angular; base full, smooth, with no 
indication of an umbilicus or axial depression; aperture subovate, pointed 
in front or behind; outer lip thin, sharp, simple; pillar rather thick, white, 
with a smooth, well-marked callus over the body; operculum dark brown, 
with strong incremental lines. Height of (somewhat eroded) shell, 17; of 
I 7101 
