218 EOCENE MOLLUSCA. 



No. 144. Pleurotoma rostrata, Solander. Tab XXVI, fig. 8 a — c. 



Murex rostratus, Sol. 1766. Brand., Foss. Hanton., p. 21, t. 2, fig. 24. 



Pleurotoma rostrata, Sow. 1818. Min. Con., vol. ii, p. 104, t. 146, fig. 3. 



— — De Bl. 1826. Diet. des. sci. nat., vol. xli, p. 390. 



— — Morris. 1842. Cat. Brit. Foss., p. 157. 



— sub-rostrata, D'Orb. 1850. Prod, de Paleont., vol. ii, p. 359, No. 406. 



— rostrata? Phil. 1851. Tert. Foss. Magdeb. (Pabeont., vol. i, p. 64), No. 118. 



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



Nee Pleurotoma rostrata, De Eon. 1837. Desc. des. coq. foss., &c., de Basele, Boom, &c., 



p. 24, No. 23. 

 nee — — Nyst. 1843. Desc. des. coq. foss., &c, de la Belg., p. 522, t. 42, 



figs. 2, 3. 

 nee — — lb. 1843. Bull. Soc. Geol. de France, vol. xiv, p. 453. 



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

 acuminata: anfractibus numerosis, convexis, in medio oblique tuberculatis ; marginibus 

 posticis concavis, ad suturam aliquando paulum incrassatis et cingulo duplici crenuiato 

 cinctis, aliquando simplicibus ; lineis spiralibus in margine tenuibus, cateris elevatis, 

 rotundatis, irregularibus, inaqualibus, lineis incrementi per-asperatis : aperturd oblongo- 

 ovali, in canali pralongo, angustato, subrecto productd; labro alifortni ; sinu pro/undo 

 mediocriter lato, in margine collocato. 



Var. antiqua. Testa latiori, breviori ; anfractibus subangulatis. 



Shell long, narrow, fusiform, turreted, having the whole surface covered with spiral 

 raised lines ; the spire much elevated, being nearly half the length of the whole 

 shell, and pointed; the whorls are numerous (10 — 12 without the pullus), very 

 convex, and armed near the middle with a single row of oblique tubercles, more or 

 less prominent in different individuals ; the posterior margins are moderately wide, 

 concave, occasionally thin, and nearly smooth along the sutural edge, but more fre- 

 quently slightly thickened, plicated, and ornamented with two prominent concentric 

 lines, granulated by the lines of growth. The spiral lines in the middle of the posterior 

 margin are close-set and very slender ; over the other parts of the whorl they are pro- 

 minent, rounded, irregular, unequal, small filiform lines intervening between larger 

 ones ; and all are very much roughened, almost granulated, by the lines of growth. 

 The aperture is of an oblong, ovate form, and terminates in front in a long, rather 

 narrow, and somewhat curved canal ; the outer lip is roundedly arched and wing-like ; 

 the sinus is deep, moderately wide, subtrigonal, and placed in the middle of the margin. 



In the specimens from Highcliff (var. antiqua, fig. 8 c), the shells are wider, and 



