﻿PROSOBR ANCHI ATA. 



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No. 230. Pleurotoma curta. F. E. Edwards. Tab. XXXJ, fig. 2, a, b. 



P. testa parvd, subfusiformi, turritd, tuberculo-plicatd, undique transversim sulcata: 

 spird sub-conicd, acuminata; anfractibus convexiusculis, ad humeros sub-angulatis, tuber- 

 cut atis ; postice concavis, granulato-marginatis ; ultimo anfractu repentissime coarctato, in 

 canalem brevem producto ; tubercidis sub-distanlibus, oblongis, bifurcis, plicas duas arcuatas 

 formantibus ; sulcis transversis confertis, supra canalem perspicuis, caterum fere obsoletis : 

 aperturd obovali ; labro leviter arcuato ; sinu lato, brevi, sub-trigono, ad kumertm collocalo. 



Shell small, rather fusiform, turreted, tuberculous, and concentrically furrowed : 

 the spire, somewhat conical, pointed, and moderately elevated, being of equal length 

 with the aperture. The whorls are very slightly convex, and bluntly angulated at 

 the shoulders, where they are furnished with a row of short, vertical, oblong tubercles, 

 which bifurcate in front, and are produced into two narrow, oblique, unequally arched, 

 fold-like costellse, which extend to the beginning of the canal; the posterior margins 

 are rather deeply channeled and bordered round the suture by a single row of small, 

 round granulations, corresponding with the tubercles on the shoulders ; the last whorl 

 is suddenly and much contracted towards the front, resembling that of P. coarctata ; 

 the transverse furrows are numerous, perspicuous over the canal, but elsewhere 

 nearly obsolete. The aperture is rather widely oval ; the outer lip moderately arched ; 

 and the sinus, which is placed on the shoulder, is wide, rather deep, and semi- 

 elliptical in form. 



I know only the figured specimen of this species, and this is probably an imma- 

 ture individual. It presents a close resemblance to P. bracheia, with which, without 

 a careful examination, it may be easily confounded. On comparing the two shells, 

 however, it will be seen that in the present species the spire is more regularly tapering, 

 the posterior margins a little more depressed and more deeply channeled ; the granu- 

 lations round the suture smaller, and placed opposite to the tubercles on the shoulders, 

 and the body whorl much more contracted. These differences, with the bifurcated 

 tubercles, the different character of the transverse ornamentation, and especially the 

 shape and position of the sinus, are sufficient to entitle the present shell to specific 

 distinction. 



Size. — 7-24ths of an inch ; diameter, 3-24ths of an inch. 

 Locality. — Alum Bay (Strat. No. 29, Prestw.) 



No. 231. Pleurotoma puella. F. E. Edicards. Tab. XXXI, fig, 15, a, b. 



P. testa elongato-fusiformi, spiraliter granoso-lineatd : spird elevatd, obtusiusculd, sub- 

 conicd; anfractibus convexiusculis, ad humeros ttnicd serie tubercidorum brevium ornatis ; 



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