270 EOCENE MOLLUSCA. 
spire, the short, nearly conical whorls, the broad, upright ribs, the distant, transverse 
lineation, and the short, anterior canal, render it easily distinguishable. I dedicate 
the species to the Rev. Osmond Fisher, the rector of Elmstead, near Colchester, 
a zealous and indefatigable fellow-labourer in this branch of Eocene Paleontology, 
to whose researches I am indebted for the discovery of the locality from which 
the species has been obtained. 
Size.—Axis, not quite 5-12ths of an inch; diameter, 2-12ths of an inch nearly. 
Locality — Brook (New Forest). 
No. 193. Pievroroma Tattavienesut. Rouault. Tab. XXXII], fig. 9, a, 4. 
PLEvRoTOMA TALLAVIGNESII. JRowaulé, 1848. Descr. des Foss. du Terr. Eocéne des Eny. 
de Pau; (Mém. Soc. Géol. de France, vol. iii, 2d ser., 
p. 482, t. 16, figs. 18, 19.) 
P. testa elongato-fusiformi, turritd, transversim irregulariter lineata, longitudinaliter 
costellatd : anfractibus converiusculis, angulatis ; postice concavis, ad suturam marginatis ; 
costellis numerosis, angustis, obliquis, bifurcatis ; aperturd elongato-angustd, in canalem 
rectum longiusculum producta ; labro arcuato ; sinu lato, sub-trigono, in margine collocato. 
Shell elongated, fusiform, turreted, longitudinally ribbed, and concentrically lined ; 
the spire moderately elevated, not equalling the last whorl in length: the whorls 
rather deep and slightly convex, almost flat-sided, and sharply angulated at the 
shoulders ; the posterior margins wide, slanting, concave, and thickened along the 
sutural edge, where they present either three or four prominent, raised lines, or 
a narrow, ribbon-like band, sometimes bisected by a concentric furrow: the whole 
surface between the suture and the shoulders is ornamented by a series of curved 
plications, caused by the successive edges of the advancing sinus. The longitudinal 
ribs are numerous, narrow, oblique, much curved, and short, not extending beyond 
the middle of the whorls; they are not very prominent, and most frequently bifurcate 
shortly after their origin on the shoulders ; the last whorl is much produced in front, 
where it forms a longish and moderately wide canal. The aperture is of a lengthened 
oval form; the outer lip is much arched, and presents in the posterior margin a 
widely sub-trigonal sinus. 
The present species affords another instance of the identity of forms hitherto 
found only in the Lower Eocene deposits in England with forms characteristic of 
the Nummulitic Beds of France; but the English specimens agree so well with the 
figures and description given by Rouault, and more especially with his Var. a, that, 
the identity can scarcely be questioned. 
I have already pointed out the differences between the present species and 
P. pyrgota, the only English Pleurotoma which resembles it. 
