ILL VSTRA TIONS OF AMERICA N SHELLS— DA LL. 547 
distinct, aperture subovate, eanal moderate, more or less recurved, 
j)iliar twisted, anteriorly attenuated; base hardly constricted; long, of 
shell 1(5.5, of aperture and canal 10.0; max. lat. 8 mm. 
Dredged off Avalon, in the Santa Barbara channel, California, by 
the U. S. Fish Commission steamer Alhatross, at station 3664, in 80 
fathoms, sand, bottom temperature 50° F.; U.S.N.M., I0i»109. 
B. (AVALONENSIS variety?) EUCYMATUS Dall. 
Shell not spiny at the shoulder, larger, with 15 to 18 varices, hardly 
raised and barely angular at the shoulder; long. 27; max. lat. 1».5 mm. 
Dredged at station 2935, in 124 fathoms, off San Diego, California; 
bottom temperature 49°. 2 F.; U.S.N.M., 109087. 
A still more slender specimen has onlj^ 7 varices, and is somewhat 
intermediate between the type and the variet}'. It is a common thing 
for the aspinose variety of any species of Boreotroplion to have a 
greater number of varices than the spiny form, in harmony, perhaps, 
with some law of secretion. 
BOREOTROPHON ROTUNDATUS, new species. 
Shell small, with rather short spire and live or more full}' rounded 
wdiorls; nucleus eroded; subsequent whorls with (on the last) about 
14 keeled ribs, angular, but not spinose, at the shoulder, passing over 
the whorl to the base; spiral striation obsolete or none; aperture sub- 
ovate, 3'ellowish within; canal moderate, recurved; Ion. of shell 16; 
of aperture and canal 10; max. lat. 7 mm. 
Dredged in Bering Sea, southeast from the Pribilof Islands, l)y the 
U. S. Fish Conmiission steamer Alhatross at station 36( »9, in 74 fathoms, 
umd and sand, bottom temperature 38° F.; U.S.N.M., 149614. 
I am unal^le to unite this pretty little shell with any of the other 
species. It is, perhaps, most similar to the B. cepula Sowerby, var. 
cyviatus Dall, a much larger shell. It differs from nearl}' all the other 
species in having the varices represented by stout ribs, and not by a 
sharp lamina or imbrication. 
BOREOTROPHON CEPULA Sowerby. 
This is the shell described in 1880 in the Thesaurus Conchy liorum, 
and regarded as the Fuiius lamelloKim Gray, 1839, a specific name pre- 
occupied in both Fimus and Trophm. The true lamellosus of Gray is 
a variety or mutation of Boreotrophon dalU Kobelt, and not the spe- 
cies now under consideration. B. cepula is found in from 41 to 85 
fathoms in Bering Sea north of Fnimak Island, and in the Pacific 
south of Unimak; also dredged by Optain St. John in 4S fathoms on 
the north coast of Japan, 
The same species has been received from Pleistocene terraces on the 
shores of Volcano Bay, Japan, collected by Pumpelly, It has from 
