248 EOCENE MOLLUSCA. 
Size.—Axis, rather less than half an inch; diameter, not quite 2-12ths of an inch. 
Localities—Barton, Highcliff, Alum Bay (No. 29, Prestwich). For the variety: 
Clarendon and Southampton. 
No, 169. Pxieurotoma puicata. Lamk. Tab. XXVIII, fig. 11, a—e. 
PLevroroma pLiicaTa. Lamk. 1804. Ann. du Mus., vol. iii, p. 169, No. 14. 
— — Lamk. 1822. Hist. natur., &c., vol. vii, p. 100, No. 19. 
— Desh. 1824-37. Deser. des Coq. foss., &c., vol. li, p. 487, t. 66, 
figs. 17—19. 
Nec — — Bast. 1825. Mem. Geol. sur les Env. de Bord., p. 64, No. 6. 
nec — — Des Moul. 1834. (Dufrén. Terr. tert., &c., du Midi de la France.) 
Ann. des Mines, 3d series, vol. iii, p. 122. 
nec — — Phil. 1836. Enum. Moll. Sicil., p. 198, No. 5. 
nec — _— Grat. 1847. Conchyl. foss., &c., du bass. de l’Adour (Atlas) ; 
Pleurot., t. 2, No. 20, fig. 36. 
P. testa crassa, elongato-fusiformi, angustda, longitudinaliter costatd, omnino concentrice 
lineaté: spira mediocriter elatd, sub-acuminatd: anfractibus convexis, suturd perspicud 
divisis ; costis rotundatis, obliquis, arcuatis, distantibus ; lineis concentricis filiformibus: 
regularibus : apertura angustd, ovali, in canali brevi exeunti ; labro acuto, intus incrassato’ 
postice, prope sinum, callum nodiformem gerente ; sinu lato, profundo, sub-trigono, in margine 
collocato. 
Shell thick, elongated, fusiform, rather narrow, longitudinally ribbed, and having 
the whole surface covered with concentric, raised lines; the spire, which consists 
of six or seven volutions, exclusive of the pullus, is moderately elevated, forming 
nearly one half of the whole length of the shell ; the whorls convex, and separated by 
a perspicuous suture. The longitudinal ribs are prominent, rounded, oblique, slightly 
curved, distant, numbering only six or seven on each whorl, and becoming nearly 
obsolete on the body-whorl; the intermediate spaces are nearly flat, imparting 
a polygonal aspect to the spire ; the concentric lines are rather numerous, elevated, 
rounded, clearly defined, and regular, giving to the shell the appearance of being 
bound with thread; the two or three lines over the shoulder are, in general, more 
distant, and a very little more prominent, than the others. The aperture is of a 
narrow, Oval form, and terminates in a wide, short canal; the outer lip is moderately 
arched, sharp on the edge, much thickened within, where it presents a long, rather 
broad, and elevated ridge, extending quite into the canal, and terminating behind, 
immediately in front of the sinus, in a round, knob-like callus; the sinus is broad, 
deep, somewhat triangular in shape, and placed in the margin. 
The English shells present several points of disagreement with those from the 
