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—lIf the specimen figured were perfect, the dimensions would be—axis, 
2 inches and 4-12ths nearly; diameter, 10-12ths of an inch. 
Locality.—Bracklesham Bay. 
No. 141. PLEUROTOMA TRANSVERSARIA, Lamarck. Tab. XXV, fig. 9 a, 4. 
PLEUROTOMA TRANSVERSARIA, Lamk. 1804. Ann. du Mus., vol. iii, p. 166, No. 6. 
— a Ié. 1822. Hist. Nat., vol. vii, p. 98, No. 1. 
— — De Blainv. 1826. Dict. des se. nat., vol. xli, p. 389. 
-— — Desh. 1832. Encye. méthod. (Vers.), vol. iii, p. 796, No. 14. 
oe -- Ib. 1824-37. Descr. des coq. foss., &e., vol. ul, p. 450, 
t. 62, figs. 1, 2. 
Nec PLEUROTOMA TRANSVERSARIA, Grat. 1838. Tabl. stat. des. coq., &c., de Adour, p. 13, 
No. 152. 
nec _ — Ib. 1838. Cat. zool., &e., de la Gironde, p. 45, No. 382. 
nec — — Ib. 1847. Conchyl. foss., &c., de ? Adour, supp. Pleurot., 
t. 1, fig. 11, No. 19. 
nec — — Sow. 1850. Dixon’s Geol., &c., of Sussex, p. 102. 
P. testé elongatofusiformi, spird acuminata: anfractibus conveatusculis, postice et 
antice tenuissime lineatis, ceterum levibus ; marginibus posticis depressis, sub-canaliculatis ; 
ultimo anfractu in canali longo, angusto, exeunti: aperturd ovata ; labro tenuissimo, arcuato ; 
sinu mediocriter lato, profundo, in margine collocato. 
Var. cypua (fig. 9 4). TZestdé minori; anfractibus conveais; 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, 
