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 j 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. ambigua, and I retain them as identical 

 with the present species, although presenting some trifling differences. 



Size. — Axis, 1 inch and 9-10ths; diameter not quite 9-10ths of an inch. 

 Localities. — Highgate, Camden Town, Hornsey, Nuneham, Southampton, and 

 Bracklesham Bay. French .• Retheuil, Cuise-Lamotte, Dax, Gaas, Lesbarritz, (fide 

 Grat.), Biaritz, Bos d'Arros, Les Corbieres (fide D'Arch.), Valognes r (fide Rouault) ? 



No. 92. Voluta crenulata. Lamarck. Tab. XX, figs. 1. a — b. 



Voluta crenulata. Lamk. 1802. Ann. du Mus., vol. i, p. 478, No. 8. vol. xvii, p. 77, 



No. 9. 



— — lb. 1816. Tableau Encyc. et Me'th., t. 384, fig. 5. 



— — lb. 1822. Hist, natur., &c, vol. vii, p. 351, No. 9. 



— — Befr. 1829. Diet, des Sci. nat., vol. lviii, p. 476. 



— — Desk. 1833. Encycl. method. (Vers,) vol. iii, p. 1145, No. 28. 



— — lb. 1824-37. Descr. descoq. foss., &c., vol. ii, p. 693 ; t. 93, fig. 5 — 9. 



— — Bronn. 1838. Lethsea geognost., p. 1106 ; t. 42, fig. 4. 



— — ? Brogn. 1823. Sur les terr. &c. du Vicent., p. 63. 



— — ? Bronn. 1831. Ital. Tertiiirgeb., &c, p. 18, No. 55. 

 Non. — — Sow. 1850. Dixon's Geol., &c, of Sussex, t. 5, fig. 22. 



V. testa oblongo-ovatd, costas longitudinalcs creberrimas, acutas, dentato-crenatas, ad 

 basin tendentes et sulcis transversis nwnerosis decussatas, gerenti, antice parum emar- 

 ginatd ; spird brevi, sub-turritd, ajpice acuto : avfractibus ventricosis, superne bi-canali- 

 culatis, duplici serie spinarum dentiformium coronalis ; columella quadriplicatd. 



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 



