546 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
Dredged by theU. S. Fish Commission steamer Alhatross in Bering 
Sea north of Unalaska, at station 3227, in 225 fathoms, mud, bottom 
temperature 88". 6 F.; U.S.N.M., 122594. 
The peculiar muricoid spines and sagrinate surface sufiiciently dis- 
tinguish tliis from any of the other species of the region, though it 
has a general superticial resemblance to those of the eJatkratus type. 
BOREOTROPHON MAZATLANICUS, new species. 
Shell small, thin white with a thin gra3dsh periostracum and five or 
more whorls; Avhorls with a strong peripheral carina in front of 
which, equidistant, are two feebler spiral cords; axial sculpture of fine, 
sharp, close-set low lamel]a3, extending over the whole whorl, sparser 
on the early whorls; suture distinct, not channelled, the whorl in front 
of it sloping, rooflike; canal rather straight, but broken in the unique 
type, length of three whorls without the canal 7; max. lat. 5 imn. 
Dredged by the U. S. Fish Commission steamer Albatross at station 
3431, ofl" Mazatlan, Mexico, in 995 fathoms, mud, bottom temperature 
37° F.; U.S.N.M., 123022. 
This is evident}}'' a Boreotro]_)hon though the sculpture is so unusual, 
the varices being reduced to low close-set lamellfe. Although decol- 
late and with the canal broken ofl* it seemed too remarkable a shell to 
ignore. 
BOREOTROPHON PANAMENSIS, new species. 
Shell thin, white, slender, elongate, with the spire shorter than the 
canal and aperture; whorls five or more, nucleus eroded; subsequent 
whorls with two or even three low revolving cords between the sutures 
and two fainter ones on the base, one of which may be obsolete; axial 
sculpture of rather coarse close-set elevated lines of growth, which on 
the early whorls are sparser and stronger, forming a more or less 
irregular reticulation with the spirals, the posterior of which is the 
shoulder, the space between it and the sutures is slightly convex and 
rather wide; aperture kite-shaped, rather small; the canal very long 
and wide, the pillar somewhat twisted and anteriorly obliquely atten- 
uated. Lon. of aperture and canal 11.5; of shell 18.0; max. lat. 6.5 
mm. Another specimen is 22 mm. long. 
Dredged in the Gulf of Panama by the U. S. Fish Commission 
steamer Albatross at station 3392, in 1,270 fathoms; bottom tempera- 
ture 36°. 4 F. 
This species is related to the preceding and also to B. disparilis. 
Perhaps both should be placed in Trophonojjsis. 
BOREOTROPHON AVALONENSIS, new species. 
Shell small, delicate, white, fusiform, with 1^ nuclear and five sub- 
sequent whorls; nucleus tilted, rounded, smooth; sui>sequent whorls 
finely spirally striated, with eight or nine sharp, appressed varices 
rising into radiant, narrow-grooved spines at the shoulder; suture very 
