214 EOCENE MOLLUSCA. 



terminates in a widish, moderately long, and nearly straight canal. The whole surface 

 of the shell is covered with very fine, spiral, raised lines, rather distant in front, crowded, 

 unequal, and irregular over the middle part of the whorls, where very slender, thread- 

 like lines frequently alternate with thicker and more prominent lines ; three or four 

 faint lines run along the middle of the posterior margin, and on each side of them are 

 several others, rather stronger and decussated by the lines of growth. The aperture 

 is lanceolate ; the outer lip large, and roundly arched ; and the sinus deep, moderately 

 wide, and placed in the very middle of the collar : the columella is slightly twisted. 



The shell figured forms part of my collection, and is the specimen which Mr. 

 Sowerby (loc. cit.) has referred to P. transversaria (Lam.) ; but the long, turreted spire, 

 the angulated whorls, the character of the transverse lineation, the shape of the outer 

 lip, and especially the position of the labial sinus, seem to entitle it to specific distinc- 

 tion. The species is very rare. 



Size. — If the specimen figured were perfect, the dimensions would be — axis, 

 2 inches and4-12ths nearly; diameter, 10-1 2ths of an inch. 



Locality. — Bracklesham Bay. 



No. 141. Pleurotoma transversaria, Lamarck. Tab. XXV, fig. 9 a, b. 



Pleurotoma transversaria, Lamk. 1804. Ann. du Mus., vol. iii, p. 166, No. 6. 



— — lb. 1822. Hist. Nat., vol. vii, p. 98, No. 1. 



— — De Blainv. 1826. Diet, des sc. nat., vol. xli, p. 389. 



— — Desk. 1832. Encyc. method. (Vers.), vol. iii, p. 796, No. 14. 



— — lb. 1824-37. Descr. des coq. foss., &c., vol. ii, p. 450, 



t. 62, figs. 1, 2. 

 Nee Pleurotoma transversaria, Grat. 1838. Tabl. stat. des. coq., &c., de l'Adour, p. 13, 



No. 152. 

 nee — — lb. 1838. Cat. zool., &c., de la Gironde, p. 45, No. 382. 



nee — — lb. 1847. Conchyl. foss., &c., de l'Adour, supp. Pleurot., 



t. 1, fig. 11, No. 19. 

 nee — — Sow. 1850. Dixon's Geol., &c., of Sussex, p. 102. 



P. testa elongato-fusiformi, spird acuminata : anfractibus convewiusculis, postice et 

 antice tenuissime lineatis, caterum levibus ; marginibus posticis depresses, sub-canaliculatis ; 

 ultimo anfractu in canali longo, angusto, exeunti : aperturd ovatd ; labro tenuissimo, arcuato ; 

 sinu mediocriter lato, prof undo, in margine collocato. 



Var. cypha (fig. 9 b). Testa minori ; anfractibus convexis ; marginibus posticis 

 depressioribus. 



Shell fusiform, elongated, with an elevated, nearly conical spire: whorls (10 — 11) 

 slightly convex, and depressed, almost channeled, on the posterior margins; the 

 space between the suture and the shoulder is covered with numerous, very fine, spiral, 



