294 BULLETIN OF THE 



rena, the callus especially being much less conspicuous; the whorls are less 

 flattened above than in canrena, while the present species probably never 

 attains anything like the size of the adult N. canrena. The radiating wrinkles 

 are finer and closer, as well as less evident before the suture, than in N. canrena, 

 and often almost obsolete. 



Natica (?castrensis var.) perlineata Dall. 



Shell in form, size, and nucleus resembling closely N. castrensis, but the 

 coloration consists of very fine slightly waved transverse brown lines. The 

 white band near the suture is obsolete, the brown lines cross it almost to the 

 suture, there are no spots or flammules. The base is white, the lines ceasing 

 abruptly. In the largest specimen there is a white band, extending from the 

 suture over the periphery to the base, as if the color glands had taken a resting 

 spell for a short time. Alt. 18.5, lat. 19.5 mm. 



Habitat. Sigsbee, off Havana, in 119 fms. Barbados, in 70-140 fms. Sta- 

 tion 5, in 229 fms. 



This species is less elevated, and the lineation is much finer and closer than 

 in N. lineata Lam., in which the basal white area is proportionally smaller, and 

 the umbilical callus proportionally much larger. It differs greatly from the 

 "West American lineated species N. elence Recluz, and if not a variety of the 

 preceding, from which its system of coloration totally differs, must be regarded 

 as distinct. I have not seen the operculum. 



Subgenus NEVERITA Risso. 

 Section PAYRAUDEAUTIA Bccq., Dautz., & Dollf. 

 Neverita nubila n. s. 



Shell small, polished, grayish white, with transverse narrow streaks of very 

 pale brown, five-whorled, with radiating grooves and wrinkles in front of the 

 suture as in N. livida. Apex acute, nucleus rather large, lucid ; whorls very 

 round, flatfish in front of the suture, which, near the aperture only, is a little 

 appressed. Surface pretty well covered with very fine spiral markings, too 

 fine and faint to be called striae. Aperture semilunar, with a thick white callus 

 on the body. Umbilical opening bearing about the same proportion to the 

 size of the shell as in N. intricata, but the respective components dissimilar; 

 in N. intricata the margin of the umbilicus is bounded by a rounded rib, sepa- 

 rated from another similar rib above by a deep channel. Above these two is 

 a wider and deeper furrow, above which is the larger umbilical rib, which lies 

 very close to the preceding whorl. In iV. nubila the umbilicus is bordered by 

 a sharp groove, within which is a broad nearly flat band corresponding to the 

 two lower ribs of intricata, above which are the larger furrow and rib, which 

 last is not so close to the preceding whorl as in intricata. The umbilical region 



