62 THE NAUTILUS. 



STYLOBATES n. g. 



Shell depressed-turbinate, few whorled, feebly calcified, with a 

 deep, funicular umbilicus bordered by a carina ; surface wrinkled in 

 harmony with the incremental lines ; aperture ample, interrupted by 

 the body whorl, the pillar lip straight, the outer lip and base continu- 

 ously arcuate; the suture appressed. Animal? operculum? 



Stylobates ceneus n. sp. 



Shell large, flexible, with three rapidly-enlarging whorls, winch 

 are moderately convex above, descending to a well-marked but not 

 deep appressed suture ; base convex, the margin of the umbilicus 

 carinate, its cavity straight-sided and funicular : last whorl expanded 

 at the aperture, which has a thin, simple margin, straight at the ter- 

 mination of the umbilical coil, slightly angular at the intersection of 

 the umbilical carina, the lips above separated for a short distance on 

 the body whorl ; shell of yellowish-gray color (in alcohol) with a 

 well-marked, brassy lustre ; sculpture of small, irregular wrinkles 

 harmonizing with the lines of growth ; outer lip somewhat sinuous 

 and gently excavated at the periphery ; upper margin of the aperture 

 advancing beyond the lower. Maximum diameter about 75, mini- 

 mum 40, height 35, diameter of umbilicus about 10 mm. 



Habit, station 3893 of the U. S. Fish Commission steamer "Alba- 

 tross," in the Hawaiian Islands. There are occasional minute granu- 

 lations on the surface which may, however, be merely individual 

 peculiarities. The soft parts and operculum are as yet unknown. 



This large and peculiar shell dons not closely resemble any other 

 deep-water form yet recorded. "While its proper classification must 

 remain unsettled until the soft parts are obtained, its general form 

 and habit recall several of the 7'mc/n'i/ce, and bear a curious super- 

 ficial resemblance to the New Zealand land shell formerly known as 

 IJe!tx (now Paryphunla) busbyi. 



DISTRIBUTION OF JAMAICAN SPICIZS OF COLOBOSTYLUS. 



BY P. AV. JAUVIS. 



In this group there are thirteen clearly marked species : 



Colobostylus interruptus (Lam.). C. nutlii Pils. 



C. humphreyanus (Plr.). C. albus (Sowerby). 



