278 EOCENE MOLLUSCA. 
No. 202. Prevroroma pivisa. Ff. HL. Edwards. Tab. XXXI, fig. 17, a, 6. 
P. testé fusiformi, longitudinaliter costellatd, spiraliter obscure lineata: spird obtusd, 
conicd : anfractibus convexis, postice sulco concentrico exilissime lineato exaratis ; costellis 
crassis, rotundatis, obliquis, curvis, ad suturam tendentibus, sulco marginali divisis ; lineis 
sptralibus confertis, obsoletis: apertura ovali, antice in canali longiusculo exeunti; labro 
valde arcuato, ad humerum sinuato ; sinu lato, paulo profundo, sub-trigono. 
A wide, fusiform shell, longitudinally ribbed and concentrically lined ; the spire 
thick, conical, and elevated, forming nearly one half of the entire length of the shell; the 
whorls, seven or eight, exclusive of the pullus, convex ; the posterior margins narrow, 
hollowed out by a moderately wide and shallow spiral furrow, the concentric lines 
over which are more prominent and distinct than those over the other parts of the 
whorl; the last whorl contracts somewhat suddenly towards the front and terminates 
in a widish, moderately straight canal. The ribs are numerous, thick, rounded 
on the upper surface, arched and long, stretching backwards to the sutural margin, 
and extending in front to the canal; immediately behind the shoulder they are 
crossed by the marginal furrow, by which they are divided in two, giving to the spire 
the appearance of being girt by a double row of tubercles. The spiral lines on the 
early whorls are sharp and distinct ; but on the later whorls, except over the marginal 
furrow, they are so feeble and obscure as scarcely to interfere with the smoothness of 
the surface. The aperture is oval; the outer lip much and regularly arched; and the 
sinus, which is placed on the shoulder, wide, shallow, and triangular in form. 
The present species appears to be perfectly distinct ; it is very rare. 
Size.—Axis, 10-]2ths of an inch; diameter, 4-12ths of an inch. 
Locality.—Bracklesham Bay. 
No. 203. Pxieuroroma Serysi. De Koninck. Tab. XXIX, fig. 17, a—d. 
Pievrotoma SgEtysil. De Kon. 1837. Coq. foss. de Basele, &c., p. 25, t. 1, fig. 4. 
ROSTRATA. —_ — Ibid., p. 24, No. 23 (non Sol.) (excl. syn.) 
_— ACUMINATA. — —  Ihbid., p. 24, No. 24 (non Sow.) ‘ 
— Serysil. Nyst. 1843. Coq. et Polyp. foss. de Belg., p. 515, t. 40, figs. 11 a, 
: 11 4, and 12. 
= —  WNyst. 18413. Bull. Soc. Géol. de France, vol. xiv, p. 453. 
P. testa fusiformt, turritd, undique concentrice lineatd ; spird acuminata : anfractibus 
convexiusculis, postice excavatis, crenulatis, ad humeros tuberculato-plicatis ; ultimo anfractu 
in canalem longiusculum producto ; lineis concentricis supra margines et humeros conferlis, 
exilibus, regularibus ; c@teris crassioribus, distantioribus, irregularibus ; plicis flexuosis : 
apertura oblongo-ovali ; sinu latissimo, triangulari, ad humerum collocato. 
