LEPTOTHYRA. 255 



L. iNDUTA Watson, 1879. PL 63, %. 36. 



Small, couoidal, high, whorls tumid, base flattened ; color white- 

 glossy ; whole surface faintly marked with remote spiral threads,, 

 and very faintly scratched with closer microscopic striae ; whorl& 

 bluntly angulated in the middle, and the last is so, besides, at the 

 base below the j)eriphery ; this angulation meets the outer lip ; the 

 the second and third whorls have two or three strong spiral threads , 

 there are very many close unequal oblique lines of growth ; of these 

 the strongest rise in close-set infra-sutural puckerings, which on the 

 third whorl resemble small beads ; there is a glossy, thin ivory- 

 white calcareous coat over a brilliant pearly white layer ; spire high, 

 fine-pointed; apex blunt, the smooth rounded 11 whorl scarcely 

 projecting ; whorls 6, of rapid increase, tumid, the penultimate ris- 

 ing swollen out of the suture ; base a little flattened ; suture linear, 

 not impressed, a little coarse, slightly marginated by the up-lap ot 

 the succeeding on the preceding whorl and the slight tumidity 

 caused by the infra-sutural puckerings ; aperture very oblique^ 

 round, with a soft pearly nacre all round : outer lip very slightly 

 descending, thick, bevelled outwards to a sharp edge; there is a 

 broad thin hyaline pad spread over the body and connecting the 

 outer lip and the pillar, which is broad, thick, shallowly excavated, 

 with a slight external median horizontal tooth or ridge ; the edge is 

 reverted and closely appressed. Alt. '27, diam. -25 inch. 



350 fins, in Pteropod ooze, off CiUebra Id., W. Indies^ 



Operculum small, thin, calcareous, flat, convex on the inside, 

 where it shows 7i whorls; the last whorl close to its end begins 

 suddenly to enlarge. ( Watso7i.) 



Although I have above expressed the opinion that this species a& 

 well as the following one, is identical with L. carinata Cantraine, I 

 have deemed it best to give the original description and figure. 



L. ALBiDA Dall, 1881. PI. 63, fig. 23, 24. 



" Shell stout solid, heavy, very nacreous, variable in form and 

 sculpture, rather elevated for the genus, dead white or brownish ex- 

 ternally, with the usual solid shelly operculum ; whorls 5, rounded, 

 apex obtuse, suture distinct ; sculpture of stout revolving ribs vary- 

 ing from three to six on the upper side of the whorl, crossed by 

 slight plications, most noticeable just below the sutures, but distin- 

 guishable also on the base; the ribs may be few and widely separat- 

 ed, or numerous and close-set; they may near the sutures be nodu- 



