120 GASTEROPODA. PURPURADZ. 
Shell inclining to rosy ; the whorls longitudinally sulcated 
finely, and marked with two white bands ; the superior whorls 
abruptly narrowed and flat. Height 1 and 4 inch. 
This species is not uncommonly found on the sandy parts of 
the south-western coasts of Devon and Cornwall, and on the 
shores of South Wales and Ireland, at low tide; as well as by 
dredging in deep water, on a sandy bottom. 
Gmelin, with his usual carelessness, has, on opposite pages 
of his work, described this species under two names, referring 
in both instances to the same figures in Martini, vol. ii. pl. 43. 
figs. 442, 443. 
STIRPS II. 
The genera composing this Stirps inhabits the mouths of 
rivers, as well as the deep sea. We have but one genus on the 
British coasts, which, with the other genera of the Stirps, has 
a closed siphon. 
Genus 58. OcINEBRA. 
Testa acuté elevato-spiralis: anfractus seepius transversim 
elevato-costati ; costee incrassatee. Peritrema (uisi ad sipho- 
nis productionem) perfectum, antict fimbriatum. Umbzlicus 
obtusé impresso-perforatus. Os brevissimum, rostriforme. 
Tentacula elongata, acuminato-conica, ad apices subobtusius- 
cula, ultra medium externé dilatata, oculigera. Oculi minutis- 
simi, globulosi. Pes ultra os productus. Sipho respiratorius 
brevis. 
Shell with an acutely elevated spire; the whorls generally 
bearing thickened, elevated ribs. The peritreme (excepting at 
the production of the siphon) perfect, anteriorly fringed. The 
umbilicus obtusely impressedly-perforate. 
Mouth very short, rostriform. Tentacula elongate, acumi- 
nately conic; their extremities rather inclining to be obtuse ; 
their external aspects, beyond their middle, dilated, bearing 
their eyes, which are very minute and globulose. Foot pro- 
duced beyond the mouth. Respiratory siphon very short. 
