72 EOCENE MOLLUSCA. 
contemporaneous deposits in England. The shell described by Mr. Sowerby 
(‘Min. Con.,’ vol. iv, p. 89 bis, t. 366), as B. costellatus, is an Achatina. Two of 
the French Eocene species have been found, mixed with marine remains, in the 
Faluns of Touraine; but, as yet, no species has been found below the Eocene 
formations. 
No. 23. Butimus ELLIPticus. Sowerby. Tab. XI, fig. 2 a—/. 
Buiimus eviipricus. Sowerby. 1822. Min. Con., vol. iv, p. 46, t, 337. 
—  eNvIstRiaTus. G. Sowerby, jun., 1846. Lond. Geol. Journal, vol. i, p. 20. 
B. testa sinistrorsd, ovali, elongata ; apice obtuso: anfractibus plano-convexis, superné 
sub-canaliculatis; transversim lineatis; lineis obliquis, irregularibus, plus minus-ve numerosis ; 
apertura sub-auriformi, peristomate simplici, margine columellari reflexo. 
A sinistral, cylindrically-conical shell, with an apex more or less obtuse in different 
individuals ; the whorls are slightly convex, depressed at the upper margin so as to 
form an obscure channel running parallel with the suture, and covered with numerous 
transverse raised lines, which are rounded, oblique, and vary considerably in number, 
frequently in the same specimen. ‘The aperture is oblong and ovate; the sharp outer 
margin is slightly reflected where it joms the columella, and is frequently thickened as 
it spreads over the body-whorl. 
Fig. 2f is taken from a specimen belonging to Mr. Wetherell, found in the exca- 
vations in the London Clay at Primrose Hill for the London and Birmingham Railway. 
The lineation of this fragment is fainter and more crowded, and the whorls appear to 
be more angular at the base than in BZ. el/ipticus; these distinctions mduced Mr. 
G. Sowerby to refer the shell to a distinct species. The faintness of the transverse 
lines is, however, due to the worn state of the shell, which has apparently lost the 
outer layer; and their number is a character too uncertain to be relied upon. The 
specimen represented by fig. 2a, from Mr. D’Urban’s collection, shows on one side 
of the penultimate whorl, lines nearly as crowded as those on the Highgate specimen, 
while those on the opposite side of the same whorl are moderately distant; and 
I have in my own collection a specimen, beautifully preserved, in which the same 
discrepancy occurs. The angularity of the whorls is a character frequently found 
in shells in an early stage of their growth, and I have several young shells of this 
species, in which the whorls present a clearly defined angle running round the basal 
periphery. On these grounds I have referred the specimen in question to the present 
species. 
A form occurs at Binsted, near Ryde, in which the whorls are flatter than in 
ordinary specimens, and sub-turrited; in other respects it agrees with this shell, of 
which, therefore, I consider it to be only a variety. 
