C2 THE NAUTILUS. 



Stylobates n. g. 



Shell de[)resse(l-tuil)inate, few wliorled, feebly calcified, with a 

 deep, fuiiiciiiar iinibilicus bordered by a carina ; surface wrinkled in 

 harmony witli the incremental lines; aperture ample, interrupted by 

 the body whorl, the pillar lip straiglit, 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, which 

 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 a{)erture, which has a thin, simple margin, straight at the ter- 

 miiiatioti 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. INIaximum 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 t-oft jiarts and operculum are as yet unknown. 



This large and peculiar shell ^\o^'s 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 Trochidse, and bear a curious super- 

 ficial resemblance to the New Zealand land shell formerly known as 

 Ile'-ix (now Paryphuuta) busbyi. 



DISTRIBUTION OF JAMAICAN SPECIES OF COLOBOSTYLUS. 



BY P. W. JAUVIS. 



In this group there are thirteen clearly marked species : 



Cololiustylus interruptus (Lam.). C. nuttii Pils. 



C. humphreyanus (Ptr.). C. albus (Sowerby). 



