134 THE NAUTILUS. 



single smooth median lamella which becomes very much weaker 

 in the penultimate whorl. 



Length 33.5, diameter 6.5 mm ; 13 whorls remaining. 



Length 31.5, diameter 6.5 mm. 



Locality. Subida a "La Hembrita", Monte Toro, Guanta- 

 namo. Type No. 111446 A. N. S. P., paratypes in collections 

 of Torre and Ramsden. 



This species differs from U. sowerbyana Pfr. in the following 

 details. The delicate riblets are distinctly crimped, while in 

 sowerbyana they are even ; the basal carina is decidedly more 

 prominent ; the axial lamella is thinner, and in the penultimate 

 whorl it is weaker ; the lip is shortly adnate above ; finally the 

 color of the aperture differs. 



The mantle of the animal is black, with white flames widest 

 at the upper suture, and some small white spots between the 

 flames. In life it shows through the shell, as in the figure. 



The jaw and radula of this species have been examined by 

 Dr. Pilsbry, who supplies the following notes. The jaw is ex- 

 tremely thin, composed of about 65 delicate narrow plaits, the 

 middle ones forming a triangular area of short plaits. The radula 

 has about 19.1.19 teeth, shaped like those of U. (Esochara) 

 fabreana. The central tooth is very narrow as in Esochara. The 

 dentition of the subgenus Arangia was not known before, but it 

 confirms the inferences drawn from the shell as to the general 

 position of the group. By the greater number of teeth it is more 

 generalized than the other Cuban subgenera of Urocoptis. 



DIPLOPOMA TORREI, n. sp. Plate vi, figs. 1, la. 



The shell is scarcely perforate, pupiform, truncate, slightly 

 more than four whorls remaining in the adult stage ; russet 

 vinaceous or almost white, with some small darker spots dis- 

 posed in vertical series and upon the subsutural projections. 



Sculpture of very low, rather wide, rounded spirals on the 

 last 2 or 2^ whorls, becoming strong at the base and in the 

 umbilicus of the last whorl ; about seven of these spirals visible 

 on the penultimate whorl. Vertical sculpture of crowded, fine 

 rib-striae, which are slightly thickened where they pass over 

 the spirals. The whorls are moderately convex, broadly ap- 



