92 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Turbonilla (Pyrgiscus) winkleyi senilis new var. 
PI. 12, fig. 41. 
Shell with the axial ribs retractive and very numerous, about 38 
upon the penultimate turn of the t}^e. Spiral sculpture consisting 
of about 22 incised lines of varjing width and spacing. Base with 
about twelve fine sharply incised lines. 
The t}^e, cat. no. 203,787 U. S. N. M., comes from Branford, Conn. 
It has lost the nucleus and probably the first three post-nuclear turns. 
The nine remaining whorls measure: length, 7.0 mm.; diameter, 
1.9 mm. 
The retractive axial ribs which are as a rule enfeebled on the last 
turn or two, together with the irregular spiral sculpture, characterize 
this form. In its detail sculpture, number of ribs, and spirals it is as 
variable as T. (P.) winkleyi proper. 
We have seen the following specimens: — - 
No. of 
Disposition of 
Cat. no. 
spec. 
Locality. 
material. 
203,788 
2 
Wood's Holl, Mass. 
U. S. nat. mus 
203,789 
1 
a ti u 
" " " 
203,790 
1 
li a li 
li It u 
203,791 
1 
" " " 
U 11 It 
203,787 
1 
Branford, Conn. 
It It tl 
Turbonilla (Pyrgiscus) sumneri new species. 
PL 14, figs. 53, 55. 
Shell rather small, pupiform, subdiaphanous. Nuclear whorls 
very small, two and one quarter, helicoid, having their axis at right 
angles to that of the succeeding turns in the first of which they are about 
one quarter immersed. Post-nuclear whorls inflated, angulated 
about one third of the distance between the sutures posterior to the 
periphery, sloping from this place almost in a straight line to the 
summit, and rounding suddenly from it to the anterior suture. Sum- 
mits of the whorls slightly shouldered. The axial sculpture consists 
of strong, somewhat sinuous, well rounded ribs which pass over the 
periphery of the last whorl to the umbiUcal region; there are 18 of 
these upon the 4th; 22 upon the 5th; and 28 upon the penultimate 
turn. The spiral sculpture consists of ten, subequal and subequally 
