A . JE. Verrlll — Mollusca of the N'ew England Coast. 1 5 1 



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. Sajfordi 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 meml)er of the Fish Commission parties, and associated 

 with the writer in the raalacological 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 scul])ture. 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, siinious 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 cingiili 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 



