88 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The following specimens have been examined : — 
Locality. 
Wood's Holl, Mass. 
No. of U.S.F.C. 
Cat. no. spec. 
sta. 
203,764 
1 
678 
1 
2 
153,550 
5 
770 ] 
202,889 
1 
770 
153,549 
7 
816 
153,551 
5 
818 
159,806 
1 
818 
184,236 
1 
1623 1 
Narragansett Bay, R. I. 
Long Island Sound 
Depth 
Temp. 
Disposition of 
(fms.). 
material. 
U. S. nat. mus. 
Wood's Holl coll 
Winkley coll. 
8 
62° 
U. S. nat. mus. 
8 
62.5° 
" " " 
8-10 
66° 
9 
65° 
" " " 
9 
65° 
" '•' " 
10 
65° 
" " " 
Turbonilla (Pyrgiscus) mighelsi new name. 
PI. 14, figs. 52, 54. 
= Turbonilla costulata Verrill, Rept. U. S. comm. fish and fisheries, pt. 1, 
p. 658, 1873 (not Turbonilla costulata Risso, Hist. nat. Europ. Merid., p. 224, 
fig. 72, 1S26; not Chemnitzia costulata Adams, Proc. zool. soc, p. 180, 1853). 
Shell elongate-conic, hght yellowish. Nuclear whorls "large." 
Post-nuclear whorls almost flat, very faintly shouldered at the summit, 
crossed by well rounded, moderately strong axial ribs (our specimen 
has lost the early whorls, the last six only remaining). On the first 
of these whorls there are 18 ribs; upon the 2d, 20; the 3d, 24; the 
4th, 26; and 24 upon the penultimate. The spiral sculpture between 
the sutures consists of one coarse peripheral line of pits and twenty 
fine incised lines. These fine lines are arranged in eight groups of 
two, which di^^de the space between the sutures into nine subequal 
parts; the anterior striation of each pair is a trifle stronger than its 
fellow. The space between the fourth and the fifth pairs above the 
periphery is crossed in the middle by a spiral line; the space between 
the sixth and the seventh pairs is cUvided into three equal parts by 
two slender spirals, while that between the seventh and the eighth is 
divided into three unequal parts by two striations. The space between 
the eighth pair and the summit is divided into two equal parts by a 
slender line. All these spiral markings pass up on the sides of the ribs 
but do not cross them. Periphery of the last whorl rounded, crossed 
only by the feeble continuations of the axial ribs which disappear 
before reaching the middle of the well rounded base. The spiral 
markings of the base consist of about ten feeble wavy lines. Aperture 
