CLASS GASTROPODA 
239 
Buccinum glaciale parallelum Dali, 1919 
Proceedings of the United States National Museum, 54:231. 
This variety of B. glaciale seems confined to the Bering Sea region 
and many specimens reach a length of 80-85 mm., while I have one 
95 mm. in length from Atka Island, Aleutian. Mr. Hirase, however, has 
reached the other extreme by sending a specimen, quite mature and char¬ 
acteristic, which is probably a male and measures only 26 mm. long. It 
is from Iteruo Island of the Kuril group. Both the names previously 
given to this variety were preoccupied for other species. (Dali.) 
Type in United States National Museum. Type locality, Bering Sea. 
Range. Pribilof and Aleutian Islands to Cook's Inlet; also Kuril 
Islands. 
Buccinum plectrum Stimpson, 1865 
Plate 5, fig. 5 
Canadian Naturalist atid Journal of Science, 374, 1865. Conchylien Cabinet, 2d edition; 
PI. 91, fig. 2, 1883. 
Shell rather large and thin, elongated; spire produced; sutures less 
deep than in B. tenue; whorls seven or eight, regularly convex, or slightly 
appressed, less gibbous or shouldered at the sutures than in B. tenue, 
and not carinated. Longitudinal folds very numerous, about nineteen, 
as broad as their interspaces, and most prominent near the suture; they 
are curved in a somewhat sigmoid form, and are sometimes, though 
rarely, interrupted, or have an intervening fold about the middle of the 
whorl. The striation of the surface has considerable resemblance to 
that of B. glaciale, the primary grooves being deep cut, with the inter¬ 
vening ridges depressed. But the grooving is far less regular than in 
that species; the primary grooves are more crowded near the suture, and 
the ridges less flattened. The secondary grooves on the surface of the 
primary ridges, are usually as fine as in B. glaciale, but often one or more 
of them becomes deeper, making the sculpture resemble more that of 
angulosmn. Aperture oval, less than one-half the length of the shell, 
and narrower than in B. tenue . The columella does not project beyond 
the level of the anterior part of the outer lip, but rather falls short. 
The columella shows the usual three folds, but the middle fold being 
nearly longitudinal and parallel to the lowermost fold, the latter cannot 
be seen in a front view, but it is easily seen in an edge view of the 
columella (in broken specimens of the shell) separated from the marginal 
middle fold by a longitudinal sulcus. The first and second (uppermost 
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