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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 costellae 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 Dainery, 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. innexa with a larger series of 

 the Damery shells will probably establish the identity. 



Size. — 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. 163. Pleurotoma inflexa. Zand. Tab. XXVIII, fig. 3, a — c. 



Pleurotoma inflexa. Larnk. 1804. Ann. du Musee, 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. 2/. 



— — Desk. 1824-37. Coq. foss., &c, de Paris, vol. ii, p. 475, t. 66, 



figs. 11—13. 



— — Bronn. 1849. Index Palaeontol., p. 1005. 



— semicolon. Bronn. 1849. Idem, p. 1009. 



— inflexa. If Orb. 1850. Prod, de Paleont., vol. ii, p. 357, No. 359. 



— semicolon. If Orb. 1850. Idem, p. 359, No. 423. 



— inflexa. Sow. 1850. Dixon's Geol., &c, of Sussex, p. 103. 



— dubia ? Defr. 1824-37. Desli., Coq. 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, b. 



P. testa fusiformi, sub-turritd, costellald, transversim obsolete lineatd: anfractibus 

 numerosis, angustis, sub-planis, ad suticram crenulatis ; costellis in medio in/lexis, scepissime 



* I suspect that specimens of P. inflexa (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 Stubbingtou, Bramshaw, or Brook. 



