56 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Tachyrhynchus reticulatus Mighels, 1842 
Boston Journal of Natural History, 4:50; PI. 4, fig. 19. 
T. testa turrito-subulata; anfractibus duodecim, convexis, longitudina- 
liter plicatis, transversim striatis; sutura valde impressa; apertura sub- 
orbiculari. 
Shell turreted, very slender, of a dingy white or ash color; whorls 
eleven to twelve, convex, distinctly, though somewhat irregularly plicate 
longitudinally, with from three to five delicate, impressed, revolving striae 
on the five lower whorls; from and above the fifth whorl the transverse 
striae gradually diminish in number, until they wholly disappear on the 
upper two or three whorls. The whole surface of the shell has a reticulated 
appearance. Suture well impressed; aperture suborbicular; labrum thin; 
operculum horny. Length, 7 ; breadth, 2 in. (Mighels.) 
Type in Boston Society of Natural History. Type locality, Bay Cha- 
leur, in the Gulf of St. Lawrence. 
Range. Arctic Ocean and eastern Bering Sea to the Aleutian Islands, 
to British Columbia. Also Greenland to Gulf of St. Lawrence. 
Tachyrhynchus erosus Couthouy, 1838 
Boston Journal of Natural History, 2:103; PI. 3, fig. 1. 
Shell turreted, with from nine to eleven slightly convex whorls, taper¬ 
ing gradually to a point; sutures deeply impressed; whorls having from 
three to five transverse sulci, with alternate, slightly elevated, rounded 
striae or costae, most numerous and strongly marked upon the lower 
whorl; striae of growth apparent, slightly wrinkling the shell longitudi¬ 
nally ; the portion above the last three whorls usually much eroded; aper¬ 
ture rounded, lip thin and impressed by the termination of the costae; 
columella with a very slight callus, having an angular base; color of shell 
a reddish horn color. Long., sixteen-twentieths; basal diam., six-twentieths 
of an inch. (Couthouy.) 
Type in author’s collection. Type locality, Massachusetts Bay, coast of 
Maine. 
Range. Arctic Ocean to Kuril Islands, the Aleutian and Kodiak 
Islands. Also Greenland south to Massachusetts Bay, Maine. 
Tachyrhynchus erosus major Dali, 1919 
Proceedings of the United States National Museum. 56:346. 
Shell resembling T. erosus, but much larger and coarser, of eight or 
more whorls, the apex as usual much eroded; suture almost appressed, 
rather obscure; spiral sculpture of (between periphery and suture, five) 
channeled grooves with low, flattish, wider interspaces; on the flattish 
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