242 EOCENE MOLLUSCA. 
by the narrower form of the shell, the more conical spire, the reticulated character of 
the ornamentation, the narrower margin of the whorls, and the shape of the sinus. 
Again, M. Nyst, with equal hesitation, has suggested the identity of P. innexa with his 
P. Stoffelsii; the latter shell, however, differs in the more pointed spire, the greater 
length of the whorl, the absence of the longitudinal lineation, and the position of 
the sinus, which, judging from the figure given by the author, is on the shoulder 
of the whorl. To P. dubia (Def.), a species from the Calcaire grossier, P. innexa 
presents a very close resemblance; but the French shell is much smaller, the spire 
less obtuse, the costelle fewer, more prominent in character, bifurcated and not 
decussated, and the transverse lineation is comparatively feeble. I am indebted 
to M. Deshayes for some specimens of a species from Damery, hitherto undescribed, 
which appears to be smaller and narrower than the present species, but in other 
respects to agree closely with it. A comparison of P. czmera with a larger series of 
the Damery shells will probably establish the identity. 
Stze.—Axis, 9-12ths of an inch; diameter, 3-12ths of an inch. 
Localities.—Highcliff, Barton, Alum Bay (Stratum No. 29, Prestwich), Colwell 
Bay, Bracklesham Bay, and Whitecliff Bay (fide Forbes).* 
No. 1638. Pxieurotoma inFLExa. JLamk. Tab. XXVIII, fig. 3, a—e. 
PrLevroroMa INFLEXA. Lamk. 1804. Ann. du Musée, vol. iii, p. 267, No. 22. 
—_ SEMICOLON. Sow. 1816. Min. Con., vol. ii, p. 104, t. 146, fig. 6. 
— INFLEXA. Lamk. 1822. Hist. nat., &c., vol. vii, p. 101, No. 27. 
— — Desh. 1824-37. Coq. foss., &c., de Paris, vol. ii, p. 475, t. 66, 
figs. 11—13. 
— — Bronn. 1849. Index Palzontol., p. 1005. 
— SEMICOLON. Bronn. 1849. Idem, p. 1009. 
— INFLEXA. D’Orb. 1850. Prod. de Paléont., vol. ii, p. 357, No. 359. 
— sEMICOLON. D’Orb. 1850. Idem, p. 359, No. 423. 
— INFLEXA. Sow. 1850. Dixon’s Geol., &c., of Sussex, p. 103. 
— puBIA? Defr. 1824-37. Desh., Cog. foss., &c., de Paris, vol. ii, p. 481, t. 67, 
figs. 12—14. 
Nec — SEMICOLON. Nyst. 1836. Coq. foss. de Hoesselt, &c., p. 32, No. 84. 
nec — — Nyst. 1843. Coq., &c., de Belgique, p. 527, No. 451. 
nec — — S. Wood. 1848. Crag. Moll., p. 54, t. 6, fig. 3, a, 0. 
P. testé fusiformi, sub-turritd, costellatd, transversim obsolete lineata: anfractibus 
numerosis, angustis, sub-planis, ad suturam crenulatis ; costellis in medio inflexis, sepissime 
* T suspect that specimens of P. infleca (Lamk.), a form belonging to the Bracklesham Bay series of 
deposits, have been erroneously referred to P. innexa, which that species much resembles. I do not know 
of any specimen of P. innexa coming either from Bracklesham Bay, or from Stubbington, Bramshaw, or Brook. 
