94 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The specimens from Prince Edward Island differ from those of 
Shediac, in ha^dng from one to three faint spiral lines on the base. 
We have seen 13 additional specimens from Prince Edward Island 
in Rev. H. W. Winkley's collection. 
Turbonilla (Pyrgiscus) rathbuni Verrill and Smith. 
PI. 12, figs. 33, 39. 
TurboniUa rathbuni Verrill and Smith, Amer. jom-n. sci., ser. 3, vol. 20, p. 
398, 1880; Trans. Conn. acad. arts and sci. vol. 5, p. 536, pi. 58, fig. 15, 1882. 
Shell very large, elongate-conic, milk white. Nucleus very small, 
depressed helicoid, consisting of two and one half whorls, having its 
axis at right angles to that of the succeeding turns, and about one 
fourth immersed in the first of them. Post-nuclear whorls slightly 
flattened in the middle between the sutures, summit appressed, 
crossed by strong, rounded, axial ribs of which 22 occur upon the 2d, 
3d, and 4th; 24 upon the 5th and 6th; 26 upon the 7th; 28 upon the 
8th; 34 upon the 9th; 38 upon the 10th; and about 42 upon the 
penultimate turn. On the last whorl the ribs are less strongly de- 
veloped than on the preceding turns. The spiral sculpture consists 
of about 22 lines of varjdng strength and spacing in the intercostal 
spaces. Periphery of the last whorl well rounded. Base somewhat 
inflated, rather short, marked by about 16 diversely spaced spiral 
lines, which vary in strength from mere striations to well incised lines. 
Aperture broadly ovate; outer lip thin, showing the external sculpture 
within; columella curved and somewhat reflexed. 
The specimen described and figured, cat. no. 45,459 U. S. N. M., 
has lost the nucleus and probably the first post-nuclear turn; the 
remaining eleven measure: length, 13.5 mm.; diameter, 3.8 mm. 
The nuclear whorls were described from a specimen of lot cat. no. 
94,841 U. S. N. M. 
The following; have been examined : — • 
No. of 
U.S.F.C. Depth 
Disposition of 
Cat. no. spec. 
sta. 
Locality. (fins.). 
Temp. 
material. 
154 1 
Wood's Holl, Mass. 
Wood's H. coll, 
76,726 1 
2240 
S. of Martha's Vin'd, Mass. 44 
U. S. nat. mus. 
45,463 2 • 
849 
100 
52° 
11 a ii 
45,457 1 
870 
Off " " " 155 
" " " 
45,456 5 
869 
192 
50° 
Ii 11 11 
