212 EOCENE MOLLUSC A. 



Southampton, Shenfield, Clarendon Hill, Primrose Hill, Haverstock Hill, and Alum 

 Bay (No. 4, Prestwich). In the variety crebrilinea, from Shenfield, the body- whorl is 

 short, and rather suddenly contracted in front, and the lineation is very fine and nearly 

 equal. 



No. 138. Pleurotoma crassa. F. E. Edwards. Tab. XXVI, fig. 1 a — d. 



P. testa elongato-fusiformi, longitudinaliter costulatd, spiraliter fasciatd ; spird elevatd, 

 acuminata: anfractibus convexis, antice subito coarctatis ; marginibus posticis concavis, 

 concentrice granuloso-lineatis, ad suturam incrassatis, oblique plicatis ; suturis perspicuis ; 

 fasciis spiralibus numerosis, plus minusve latis, crassis, cum lineis concentricis Jiliformibus 

 alternantibus, lineis incrementi per-asperatis ■■ aperturd oblongo-ovali ; labro leviter arcuato ; 

 sinu lato sub-triangidari in media margine collocate* ; canali antico, longo, recto. 



Shell elongate, fusiform, longitudinally ribbed, and spirally banded : spire elevated, 

 being nearly as long as half the shell, and pointed: whorls many (9 — 11), convex, 

 rather suddenly contracted, and much produced in front; the posterior margins 

 hollowed out, thickened and strongly plicated by the prominent lines of growth on 

 the suturai edge ; the ribs rounded, moderately distant, rather oblique and short, 

 not extending, even in young shells, much in front of the shoulder, and lost on the 

 last whorl of the fully grown shell. Several coarsish concentric lines traverse the 

 margins of the whorls, and are decussated by the lines of growth ; two or three on 

 the suturai edges are thicker and more elevated than the others, and from the deep 

 decussation assume the appearance of a double row of coarse granulations : the bands 

 over the middle and front of the whorls are more or less broad, prominent, rather 

 closely set, and separated by strong, thread-like lines, the whole much roughened by 

 the lines of growth : the body whorl is produced in front into a long, moderately wide, 

 and nearly straight canal. The aperture is of an oblong, ovate shape ; the outer lip 

 arched, but not much ; and the sinus, which is placed in the middle of the margin, is 

 wide and subtrigonal. Occasionally specimens occur in which the shell is wider, and 

 the spire not so much produced ; but in all other respects agreeing with the typical 

 form. 



Size. — The large specimen figured would be, if perfect — axis, 4 inches and 3- 12ths ; 

 diameter, 1 inch and 4-12ths. 



Localities. — Clarendon Hill, Southampton, Shenfield. 



No. 139. Pleurotoma planetica. F. E. Edtoards. Tab. XXVI, fig. 3. 



P. testa elongato-fusiformi, sub-turritd, undique spiraliter lineatd; spird elevatd, acumi- 



