208 EOCENE MOLLUSCA. 



and the canal. The body whorl is gradually much attenuated in front, and terminates 

 in a long, nearly straight canal. The aperture is of a lengthened oval shape ; the 

 outer lip slightly arched ; and the sinus, which is in the middle of the margin, is 

 narrow and deep. 



The young shell of the present species presents some resemblance to the variety 

 Pagoda of P. terebralis ; but the latter shell is proportionably wider and shorter, and 

 is distinguished as well by the smooth posterior margins of the whorls as by the sharp- 

 edged keel, which is turned upwards, forming a deep channel round the margin. 



Size. — Axis, 2 inches and 10-12ths; diameter, 8-12ths of an inch. 



Localities. — Highgate, Clarendon Hill, Shenfield, and Southampton. 



No. 134. Pleurotoma inarata, Sowerby. Tab. XXV, fig. 6. 



Pleurotoma inarata, Soiv. 1850. Dixon's Geology, &c, of Sussex, pp. 102, 183, t. 6, 



fig. 21. 

 — — Morris. 1854. Cat. of Brit. Foss., 2d edit., p. 270. 



P. testa elongatd, fusiformi, spiraliter lineatd ; spird conicd, acuminata: anfractibus 

 convexiusculis, postice sub-concavis, marginatis, ad suturam leviter crenulatis ; ultimo 

 anfractu in canali longo, angusto, subrecto exeunti ; striis spiralibus numerosis, lineis incre- 

 menti decussatis, alternis vet trinis crassis, cateris tenuibus .• aperturd ovatd ; labro arcuato, 

 sinu prof undo, sub-trigono, in margine collocato. 



Shell fusiform, elongated, ornamented with spiral, raised lines : spire elevated, 

 conical, pointed : whorls convex, thickened on the margin, where they present a raised 

 border running round the suture, feebly crenulated at the edge, and traversed by two 

 or three slender, concentric, raised lines ; the space between the suture and the shoulder 

 slightly concave, and covered with very fine, thread-like, concentric, raised lines, 

 which are crowded near the raised border : the last whorl terminates in an elongated, 

 nearly straight canal, almost as long as the spire. The spiral lines on the middle and 

 front parts of the whorls are numerous, strongly decussated by the lines of growth, 

 and unequal ; every alternate or third line being thick, prominent, and sharp on the 

 edges, and the intermediate lines thread-like and slender. The aperture is ovate, the 

 outer lip much arched, and the sinus, which is placed in the depression between the 

 suture and the shoulder, is deep, moderately wide, and sub-trigonal in shape. 



This species appears to be the analogue of the Barton and Highcliff species, 

 P. rostrala, from which it is distinguished by the absence of the tubercles and the ribs, 

 or undulations on the shoulders. 



Size. — Axis, 2 inches and 2-12ths; diameter, rather more than 8-12ths of an 

 inch. 



Locality. — Bracklesham Bay. 



