A. EF. Verrili— Mollusca of the New England Coast. 151 
size and the number of whorls of which it is composed, and for the 
sharpness of the tip, due to the prominence and minuteness of the 
apical whorl. The shell is more slender than most of the related 
forms and has a rougher appearance, owing to the sharp nodules along 
the spiral lines. In the latter character it most resembles P. Bene- 
dicti, but the latter is a much larger and stouter shell, with a coarser 
sculpture. P. Saffordi is a very much shorter and thicker shell, with 
much stronger sculpture and a very different nucleus. 
This elegant species is dedicated to Mr. Sanderson Smith, for 
many years a member of the Fish Commission parties, and associated 
with the writer in the malacological work. 
Pleurotomella Saffordi Verrill and Smith, sp. nov. 
PLATE XXXI, FIGURES 4, 4a. 
Shell small, thin, delicate, rather short, with very convex and 
strongly ribbed whorls, a wide, concave subsutural band, and a nar- 
row elongated canal. Whorls five or more, below the nucleus, which 
consists of three small, chestnut-brown whorls, enlarging gradually, 
and having the surface covered with minute reticulated sculpture ; 
its apex is slightly obtuse, owing to the first whorl being rounded 
and depressed, and but little smaller than the second. The whorls 
below the nucleus enlarge rapidly, the body-whorl being much larger 
than the others. The subsutural band is relatively wide, distinctly 
concave, and covered with fine, close, strongly receding, curved lines 
corresponding to the form of the posterior sinus of the lip; and not 
crossed by spiral sculpture. Below this band the whorls are suddenly 
swollen so as to produce a prominent rounded shoulder; the convex 
part of the whorl is crossed by twelve to fourteen prominent, rather 
acute, sinuous ribs, which are most prominent on the shoulder, where 
they bend obliquely forward. The concave interspaces are wider 
than the ribs. The whole surface below the subsutural band is 
covered by numerous fine, raised, spiral lines or cinguli of unequal 
size, and not closely crowded; these in crossing the ribs form minute, 
obtuse nodules. The ribs disappear at the base of the canal, but the 
spiral lines continue to its tip. The aperture is broad-ovate, some- 
what angulated at the shoulder of the whorl and at: the base of the 
columella. The posterior sinus is broad and moderately deep. The 
canal is rather elongated, narrow, and somewhat sinuous. The colu- 
mella is nearly straight for a part of its length, and then its edge 
becomes strongly, spirally curved where it borders the canal. Shell 
