A, EF. Verrill— Mollusca of the New England Coast. 263 
The form is pretty regularly elliptical. The apex is situated near 
the posterior margin, prominent, acute, and directed strongly back- 
ward; it consists of rather more than one small coil, which is 
regularly incurved and not distinctly turned to one side. The 
internal septum is narrow and transverse. 
Although not agreeing exactly with either of Jeffreys’ species, I 
refer it doubtfully to P. pertenue. 
List of Deep-water and Surface Mollusca taken off the East Coast of 
the United States by the U. 8S. Fish Commission steamers, Fish 
Hawk and Albatross, 1880 to 1883. 
The following list includes all the species hitherto dredged along 
the Gulf Stream slope, from off Cape Hatteras to Nova Scotia, 
except a small number of minute species, not yet fully identified. 
In general, those species that have not occurred below 60 fathoms 
are omitted. But the surface species of Heteropoda, Pteropoda, etc., 
belonging to the Gulf Stream region, are included, whether taken 
living at the surface or dead from the bottom. 
The “ Bathymetrical range” refers only to the range as actually 
observed in this region by the Fish Commission, unless otherwise 
stated. The geographical distribution is indicated, in a general 
way, by the abbreviations following the range in depth, but it is not 
intended to be complete in this respect. Owing to the uncertainty 
in respect to the alleged identity of the species recorded from other 
regions with our own, and to the incompleteness of the published 
lists of species collected by various recent dredging expeditions, 
the knowledge of the foreign distribution of many of these species 
is still very imperfect and sure to be largely increased within a few 
years, so that any facts of this kind that can now be given will have, 
at best, only a temporary value. The abbreviations are as follows: 
N. = northern, indicates that the species ranges northward along 
the American coast, beyond New England waters; 8., = southern, 
southward beyond Cape Hatteras; Arc., =Arctic ; Eu., =European ; 
Med., =Mediterranean; Af., =West African; P., =North Pacific; 
As., =North Asia; Cb., =Caribbean Sea and West Indies; Oc., = 
Oceanic or pelagic. 
_After the names, references are given to the pages and plates 
where the species are described or figured in this volume (vi) or the 
