216 PLIOCENE MOLLUSCA. 



I have several worn specimens from Oakley of this species, which is a charac- 

 teristic form of the Miocene deposits of France and Italy but has not been reported 

 from the Pliocene of those regions ; possibly it may be derivative in the English 

 Crag. It may be distinguished by the flatness of the whorls, its somewhat 

 inconspicuous longitudinal sculpture and the absence of the cancellate bands w^iicli 

 are rather characteristic of some Crag species, especially of 0. hipunctnJa described 

 below. My Oakley fossils agree with some specimens, here figured, from the 

 Faluns of Touraine which I have received from M. Dollfus. 



Oligotoma ornata (Def ranee). Plate XXVII, figs. 1, 2. 



1826. Pleurotoma ornata, Defrance, Diet. Sci. Nat., vol. xli, p. 390. 



1847. Pleurotoma pannus, Bellardi, Mem. R. Accad. Sci. Torino [2], vol. ix, p. 555, pi. ii, fig. 2. 



1853. Pleurotoma HecJceli, Hornes, Foss. Moll. Tert. Wien, vol. i, p. 371, pi. xxxix, fig. 20. 



1877. Olkjotoma ornata, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 238, pi. vii, fig. 25. 



1886. Genotia (Oligotoma) ornata, Dollfus et Daiitzenberg, Et. prel. Coq. foss. Touraine, p. 9. 



1890. Oligotoma ornata, Sacco, Boll. Soc. G-eol. Ital., vol. ix, p. 279, no. 4237. 



Specific Characters. — Shell elongato-subfusiform ; whorls 10, but slightly 

 convex, depressed above ; strongly sculptured longitudinally by numerous and 

 closely set lines of growth and by imdulatory spiral ridges which extend to 

 the base of the shell ; in the middle of each whorl are bands of well-marked 

 costae, discontinuous, but elongated longitudinally, as wide as the spaces between 

 them; apex blunt; suture slight; mouth narrow, angulate above; canal open, 

 notched and. twisted ; columella distorted. 



Dimensions. — L. 22 mm. B. 7 mm. 



Distiibutioii. — Not known livinof. 



Fossil : Waltonian Crag : Little Oakley. 



Miocene: Touraine, Italy (Tortoniano, Elveziano), Vienna basin. 



RemarJcs. — I have a single specimen of this very distinct species from Oakley 

 corresponding with one which M. Dollfus has kindly sent me from the Faluns of 

 Touraine. At first it was identified by Bellardi with 0. pannns, but afterwards, 

 in 1877, with F. ornata, Defrance, in which he has been followed by MM. Dollfus 

 and Dautzenberg, and with P. Hecl'eli, Hornes. It is a characteristic Miocene 

 species which, except for this unique example from Oakley, has not been recorded 

 from any Pliocene deposit. The latter, however, is beautifully perfect, quite 

 unworn, and has the usual appearance and character of a Crag shell. 



Oligotoma festiva (Doderlien in Hornes). Plate XXVII, figs. 5 — 7. 



1856. Pleurotoma festiva, Hornes, Foss. Moll. Tert. Wien, vol. i, p. 337, pi. xxxvi, fig. 15. 

 1872. Pleurotoma festiva, von Koanen, Mice. Nord-Deutsch. Moll. Fauna, vol. i, p. 103, no. 116. 



