﻿PROSOBRANCHIATA. 



295 



slightly curved, projecting towards the front, thin, sharp-edged, and smooth within ; 

 the inner lip is very thin ; the columella nearly straight and cylindrical ; and the 

 sinus, which is placed on the shoulder, is very wide, shallow, and triangular. 



This singular species appears to be exceedingly rare; only four specimens are known 

 to me, one of which (the figured specimen) is in my own collection, the other three 

 form part of Mr. Wetherell's collection. 



Size. — Axis, 1 inch and3-12ths ; diameter, 5-1 2ths of an inch. 



Locality.— Finchley. 



No. 219. Pleurotoma scalarata. F. E: Edwards. Tab. XXXI, fig. 6, a, h. 



P. testa elongato-fusi/ormi, turritd, tuberculatd, spiraliter lineatd : spird acuminata, 

 elevatd : anfractibus angulatis, brevibus, convexiusculis; marginibus posticis angustis, 

 depressis, adsuturam granulato-lineatis ; ultimo anfractu repente coarctato, antice in cana- 

 lem brevem, obliquum, producto ; tubercidis numerosis, obliquis ; lineis spiralibus confertis, 

 Jiliformibus, irreguiaribus, sub-clathratis : aperturd ovali ; labro lev iter arcuato, adliumerum 

 sinuato ; sinu latiusculo, subprofundo, sub-trigono. 



Shell elongate, fusiform, turreted, tuberculated, spirally lined ; spire pointed, much 

 produced, being more than half as long again as the aperture ; whorls, eight or nine, 

 exclusive of the pullus, angulated at the shoulders, and slightly convex in front ; 

 the posterior margins very narrow, depressed, furrowed, and bordered round the 

 suture by a narrow band, traversed by one or two raised, spiral lines, which are 

 occasionally broken into small, roundish, oblong tubercles ; the last whorl is short, 

 much contracted in front, and produced into a rather wide, short, but distinct, and 

 oblique canal. The tubercles are numerous, oblong, narrow, slightly oblique, and a 

 little compressed anteriorly. The spiral lines are crowded, thread-like, irregular, 

 and unequal, slender lines frequently intervening between thicker lines ; and they 

 are roughened, almost decussated, by the conspicuous lines of growth. The aper- 

 ture is oval, the outer lip very slightly arched, sharp-edged, and smooth and simple 

 within ; and the sinus, which is placed on the angle of the whorl, is moderately 

 wide, not very deep, and somewhat triangular in form. 



The coronated whorls, with their depressed, almost tabulated, margins, and 

 the roughened lineation, give a marked character to this Pleurotoma, and will readily 

 distinguish it from P. obscurata. 



Size. — Axis, nearly ll-12ths of an inch ; diameter, 3-12ths of an inch. 



Localities. — Bramshaw, where it is not uncommon, Brooke, and Stubbington. 



