PROSOBRANCHIATA. 213 



natd: anfractibus numerosis, angulatis, convexis, sub-ventricosis, in juventd tuberculatis ; 

 marginibus posticis latiusculis, concavis; ultimo anfractu in canali longo, recto, terminanti ; 

 striis spiralibus numerosis, inaqualibus, lineis incrementi asperatis ; striis duobus vel tribus 

 ad humeros prominentioribus : aperturd pyriformi ; labro arcuato ; sinu lato, prof undo, in 

 margine collocate. 



Shell elongate, fusiform; spire much produced, pointed: whorls many (10 — 12), 

 convex, somewhat ventricose, angulated at the shoulders, much attenuated, and pro- 

 duced in front, the last whorl terminating in a long, straight, moderately wide canal ; 

 the posterior margins are rather wide, depressed, channeled along the middle, and 

 somewhat thickened at the edge, so as to present a broadish, slightly elevated border 

 round the suture. The angulated shoulders, and depressed posterior margins of the 

 whorls, give a turreted character to the spire. Two sharp, elevated, and rather distant 

 spiral lines run round the border, and several faint and unequal lines traverse the 

 hollow part of the margins. On the middle and front parts of the whorls the spiral 

 lines are numerous, irregular, and unequal, a slender, thread-like line occasionally 

 occurring between thicker and more elevated lines ; two or three on the shoulder are 

 more prominent and distant than the rest. The aperture is pear-shaped, rounded 

 behind, contracted in front ; the outer lip much arched ; the sinus wide, very deep, 

 sub-trigonal in form, and placed a little in front of the middle part of the margin. 



This elegant Pleurotoma is apparently confined to the middle eocene strata ; it has 

 hitherto been obtained only from Bramshaw and the synchronous beds at Bracklesham 

 Bay. 



Size. — Axis, 2 inches and 9-12ths ; diameter, 10-1 2ths of an inch. 



No. 140. Pleurotoma gonlea, F. K Edwards. Tab. XXV, fig. 10. 



Pleurotoma transversaria, Sow." {non Lam) 1850. Dixon's Geol., &c, of Suss., p. 102. 

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



P. testa elongato-fusiformi, turritd, lineis spiralibus omnino tectd ; spird elevatd .- 

 anfractibus depresso-convexis, angulatis, obscure carinatis ; marginibus posticis latis, sub- 

 concavis, ad suturam crenulatis ; ultimo anfractu in canali mediocri, subrecto, exeunti ; lineis 

 spiralibus tenuibus, confertis, irregularibus : aperturd lanceolatd ; labro rotundo-arcuato ; 

 sinu mediocriter lato, prof undo, in margine collocato. 



Shell elongated, fusiform, turreted ; spire elevated, apparently much exceeding 

 the last whorl in length : whorls rather convex, flattened at the sides, and angulated 

 at the shoulders, which slightly project, and present the appearance of an obscure, 

 rounded keel; the posterior margins are very wide, hollowed out, and crenu- 

 lated round the suture; the last whorl contracts rather suddenly in front, and 



28 



