﻿PROSOBRANCHIATA. 



263 



No. 184. Pleurotoma bracheia. F. E. Edwards. Tab. XXIX, figs. 9, a, b. 



P. testa parvd, sub-fusiformi, turritd, longitudinaliter costatd, concentrice lineatd : 

 spird obtusiiiscidd aperturam in longitudine paullo superanti : anfractibus planulatis, 

 ad humeros angvlatis, postice concavis, et unicd serie nodulorum munitis ; ultimo 

 anfractu valde coarctato, in canalem breviusculum producto ; costis numerosis, obliquis, 

 angustis, fere ad basin tendentibus ; lineis concentricis sub-distantibus, acutis, irregu- 

 laribus : aperturd angustd, ovali ; labro leviter arcuato, intus prope sinum cattoso ; sinu 

 lato, brevi, in margine collocato. 



Shell small, fusiform, turreted, longitudinally ribbed, concentrically lined: the 

 spire rather thick, and moderately elevated, being a little longer than the aperture : the 

 whorls flat-sided, angulated at the shoulders ; the posterior margins narrow, channelled, 

 and furnished with a single row of largish round knobs, alternating with the ribs ; 

 the last whorl is much contracted in front, and ends in a wide, somewhat short, and 

 oblique canal. The longitudinal ribs are moderately thick, rounded on the surface, 

 separated by concave spaces as wide as the ribs, oblique, tapering towards the front, 

 and extending to the anterior canal ; the concentric lines are distant, prominent, and 

 thread-like. The aperture is of a narrow, oval shape ; the outer lip slightly arched, 

 sharp on the edge, thickened within near the apex of the sinus, and presenting two 

 transverse, oblong callosities, similar to those which characterise P. callifera; the 

 sojs is shallow, rounded, and wide, extending over the whole of the posterior 

 margin. 



The only specimen I possess has probably not attained its full growth, but it 

 presents an union of characters which distinguishes it from all its congeners. It is 

 apparently very rare. 



Size — Axis, 3-5-1 2ths of an inch ; diameter, 15-12ths of an inch. 



Localitg. — Barton. 



No. 185. Pleurotoma sindonata. F. E. Edwards. Tab. XXIX, fig. 12, a, b. 



P. testa parvd, gracili, fusiformi, undique spiraliter lineatd, clathratd: spird sub- 

 conicd, acuminata: anfractibus convexiusculis, ad humeros sub-carinatis, postice plicatis, 

 marginatis; lineis spiralibus elevatis ,f.liformibus, irregularibus, supra margines fere obsoletis; 

 lined unicd humeros cingenti eminentiori, in juventd denticulatd : aperturd ovali, antice in 

 canali indistincto exeunti ; labro leviter arcuato, ad rnarginem posticam late sinuato. 



A small, slender, fusiform shell, spirally lined, and having an elevated, nearly conical 

 and pointed spire, formed of six or seven volutions ; the whorls very slightly convex 

 and sharply keeled round the shoulders ; the posterior margins wide, sloping gently 



