400 RINGICULA. 



the former name having priority. The locality, description and 

 figure of R. peracuta agree well with the varieties of R. nitida, with 

 which it does not seem to have been compared. The elevation and 

 the extent of the spiral grooving differ in different individuals, as 

 observed with species of Actceon. 



R. PERACUTA Watson. PI. 46, fig. 37. 



Shell ovate, with a somewhat high conical small-pointed spire, 

 smooth and glossy, spirally furrowed below the periphery, with a 

 marginated suture and a largish mouth. Sculpture: Longitudinals 

 the whole surface is pretty regularly scored with distinct, but not 

 sharp, shallow furrows on the lines of growth. Spirals just below 

 the suture is a fine furrow fictitiously strengthened by the the shin- 

 ing through of the superior whorl ; from the periphery to the point 

 of the base there are rather remote spiral furrows which seem to 

 vary as usual in number and in distinctness. Color, glossy white, 

 with a faint bluish tinge. Spire rather high, conical, scarcely sub- 

 sealer. Apex sharp, for though the extreme tip is a little tumid, it 

 stands well up and is rounded. Whorls 5, conical, slightly convex ; 

 the last is a little tumid above, but a little way behind the outer lip 

 is somewhat contracted and flattened. Suture distinct. Mouth 

 rather large, not very oblique. Outer lip very oblique to the axis 

 of the shell, slightly thickened, toothed and prominent in the mid- 

 dle, with large open sinus above and a very slight one in front. 

 Inner lip: there is a rather slight callus with a small tooth about 

 the middle: the pillar teeth, which are very far from parallel, are 

 nearly equal. Alt. 0'18 in., diam. 0*1. Mouth, height, 0*1 ; breadth, 

 0-07 inch ( Wats.). 



North ofCulebra Island, 390 fms. ; of Bermudas, 1075 fms; of 

 Pernambuco, 350 fms. (Challenger). 



R. peracuta WATS., Chall. Gastr., p. 636, pi. 47, f. 11. Conf. 

 DALL, Blake Gastrop., p. 44. 



Dall considers this a form of 1?. nitida. 



Ringicula yrandinosa Hinds., from the West African coast, is not 

 unlike this species, but is smaller; the body-whorl in particular is 

 much smaller, while the penultimate is larger; it is without sculp- 

 ture on the base, and the upper whorls are strongly spiralled. 

 Ringiculu <icut<i Phil., from the Red Sea, is smaller, with a less 

 swollen body-whorl and more tumid base, the whorls of the spire are 

 less tumid and less exserted. Ringicula someri De Folin, from the 



