538 PROCEEDINGS OF THE NATIONAL MUSEUM. vouxxiv. 
usually callod a variety. That species sometimes has a feeble varical 
angle on the shoulder, but the present one is always angular there, the 
varices stand out from the shell and are distinctly developed; the 
suture is rather constricted and the whorl in front of it usually exca- 
vated; the surface is closely spirall}^ striated, the spire elevated, the 
canal nearly straight. There are eight to eleven varices and the angle 
at the shoulder is often nearly spinose. The species reaches a length 
of 33 nuu., and ranges from Finmark to Greenland and Massachusetts 
in 3 to 200 fathoms. It is a more slender and elegant shell than 
£. dathmtax. Reeve's figure of '"''Fusiix^'' gunner! in the Iconica does 
not represent this species. 
Section TROPHONOPSIS Bucquoy, Dautzenberg, and DoUfus, 1882. 
BOREOTROPHON MACLAINI, new species. 
Shell small, yellowish white with live or more whorls; nucleus tilted, 
smooth, flat above, with the margin of the plane forming a strong carina 
which is continued as a spiral thread at the shoulder in the subsequent 
whorls; the first whorl which follows the nucleus has two spiral threads, 
the number of these gradually increases until the fifth whorl has thir- 
teen, closer in front of the suture and behind the shoulder and also on 
the l)ase; less crowded on the peripheiy, and crossing (on the fifth 
whorl twenty) arcuate, regular, slightly -elevated ribs with subequal 
interspaces which extend over the periphery and fade out on the base; 
spire longer than the aperture; canal straight or slightly recurved, 
short; pillar straight, obliquely truncate in front; periostracum yellow- 
ish; Ion. of shell 6.5; of aperture 3.2; max. diam. 3.0 mm. 
Dredged otf the coast of Greenland by P^nsign C. S. McClain, of 
U. S. S. Alert. U.S.N.M. 126974. 
This is a Troplwnopsis., somewhat of the type of B. harvicensu., which, 
however, has a rounded nucleus and lamellar varices. The single 
specimen obtained is not fully mature and the species doubtless attains 
a somewhat larger size. It can not be mistaken for any of the other 
species of the region. 
BOREOTROPHON CRATICULATUS Fabricius. 
This is the Trltonmm craticulatum Fabricius in 1780 (not the Murex 
craticif/atusoi Linna?us), the T. fabric ii Beck, 1842, and the T. horealis 
of Reeve (as Murex), 1845. 
Greenland is its metropolis, but it extends, in 30 to 80 fathoms, to 
the Newfoundland Banks on the south and Finmark on the east. It is 
the type of the section Trophonopsis. and is readily recognized by its 
elongate form, thin, rather rude varices and strong spiral threading. 
It rarely develops a varical angle at the shoulder. 
