off the southern coast of New England. 299 
Alloposus mollis V errill. 
fathoms; the other at 994, in 368 fathoms. The former 
weighed over 20 pounds. Length from end of body to tip of 
Ist pair of arms, 31 inches; of 2d pair, 32; of 3d pair, 28; of 
4th pair, 28; length of mantle beneath, 7; beak to end of 4th 
pair of arms, 22; breadth of body, 8; breadth of head, 11; 
diameter of eye, 25; of largest suckers, °38. 
The only additional Pteropod taken this year is Zriptera 
columnella (Rang), from station 947. Among the Gastropods 
there are a considerable number of species not obtained last 
year. Perhaps the most remarkable discovery, in this group, 
is a fine typical species of Doliwm (D. Bairdit) taken alive, in 
202 fathoms. This genus is almost exclusively tropical in its 
distribution. On our coast, D. galea extends northward to 
North Carolina. This southern form, with a large Marginella, 
taken both this year (station 949) and last, an Avicula, and 
various other genera, more commonly found in southern waters, 
are curiously associated, in this region, with genera and species 
which have hitherto been regarded as exclusively northern or 
even arctic, many of them having been first discovered in the 
ters of Greenland, Spitzbergen, northern Norway, Jan 
Mayen Land, ete. 
Among the northern species which had not been found pre- 
Dolium Bairdii Verrill and Smith, sp. nov. 
A moderately large species, having nearly the form of D. perdi 
and D. zonatum. Male. Shell broad ovate, with seven broadly 
rounded whorls ; spire elevated, apex acute; nuclear whorls 
about three, smooth ; suture impressed, but not deep, nor chan- 
nelled, the last whorl is somewhat flattened (perhaps abnormally) 
below the suture, for some distance, corresponding to an inward 
flexure of the outer lip. Aperture elongated, irregularly 
ovate; outer lip regularly rounded, except for a short distance 
posteriorly, where it is slightly incurved, its edge is excurved, 
acute externally, distinctly but not prominently crenulated 
Within, except posteriorly, where a posterior canal is slightly 
indicated; columella straight; canal short and broad. The 
Sculpture is peculiar: it consists of numerous (about 40 on the 
last whorl) rather prominent, squarish, clearly defined revolv- 
ing ribs, less than 1™™ broad, separated by interspaces of about 
