154 EOCENE MOLLUSCA. 
M. Rouault has described some shells from Bos d’Arros, in the neighbourhood of 
Pau, which he considers to be varieties of Lamarck’s V. ambigua; but, judging from 
the figures given, they appear to be equally distinct from that species, and from 
Solander’s Stromb. ambiguus. M. D’Archiac merely records the species without figure 
or description ; but one of the localities given by him is Bos d’Arros, and the shells to 
which he refers may, therefore, belong to the same species as those described by 
M. Rouault. I have on this account cited his work, as well as that of M. Rouault, 
with a query. The shells from Dax and its neighbourhood, figured by Grateloup, 
D’Orbigny considers to belong to a distinct species, which he has named V.. sub-ambigua ; 
but, judging from the figures and from the only specimens I have seen from that 
locality, they appear to belong to Lamarck’s V. améigua, and I retain them as identical 
with the present species, although presenting some trifling differences. 
Stze.-—Axis, 1 inch and 9-10ths; diameter not quite 9-]10ths of an inch. 
Localities —Highgate, Camden Town, Hornsey, Nuneham, Southampton, and 
Bracklesham Bay. /rench: Rétheuil, Cuise-Lamotte, Dax, Gaas, Lesbarritz, (fide 
Grat.), Biaritz, Bos d’Arros, Les Corbicres (fide D’Arch.), Valognes + (fide Rouault) ? 
No. 92. VoLUTA CRENULATA. Lamarck. Tab. XX, figs. 1. a—é. 
VoLUTA CRENULATA. Lamk. 1802. Ann. du Mus., vol. i, p. 478, No. &. vol. xvii, p. 77, 
No, 9. 
— _ Ib. 1816. Tableau Encye. et Meéth., t. 384, fig. 5. 
— — Té. 1822. Hist. natur., &., vol. vii, p. 351, No. 9. 
_ — Defr. 1829. Dict. des Sci. nat., vol. lviii, p. 476. 
_ — Desh. 1833. Encyel. méthod. (Vers,) vol. ii, p. 1145, No. 28. 
— — Ib. 1824-37. Descr. des coq. foss., &c., vol. ii, p. 693 ; t. 93, fig. 5—9. 
— — Bronn. 1838. Lethzea geognost., p. 1106; t. 42, fig. 4. 
oo — ? Brogn. 1823. Sur les terr. &c. du Vicent., p. 63. 
— a ? Bronn. 1831. Ital. Tertiargeb., &e., p. 18, No. 55. 
Non. — — Sow. 1850. Dixon’s Geol., &c., of Sussex, t. 5, fig. 22. 
V. testé oblongo-ovatd, costas longitudinales creberrimas, acutas, dentato-crenatas, ad 
basin tendentes et sulcis transversis numerosis decussatas, gerenti, antice parum emar- 
ginatd ; spird brevi, sub-turritd, apice acuto: anfractibus ventricosis, superne bi-canali- 
culatis, duplict serie spinarum dentiformium coronatis ; columella quadriplicata. 
Shell ovate-oblong, rather ventricose, transversely furrowed, longitudinally ribbed, 
and but slightly notched in front ; spire short, with a small pointed apex : whorls convex, 
depressed at the sutural margin, presenting a narrow channel round the spire, crowned by 
a double row of short, erect, pointed spines, which correspond with the posterior extre- 
mities of the ribs; the ribs, which are crowded, narrow, and extend to the very base, are 
cancellated by deep, transverse furrows, and at the points of section rise into tubercles, 
which, near the base of the whorl, are short and nodiform, but which, as they approach 
