NEWTON AND HAEEIS : OLIGOCENE AND EOCENE PTJLMONATA. 73 



a form vrliich has been rather recently re-figured and recognized as an 

 Jsthnia by M. Cossmann.^ After a careful examination of the generic 

 type {Pupa edentula, Draparnaud) we do not hesitate to place our 

 specimen in the same genus. 



Formation. — Oligocene (Bembridge Beds). Locality. — Headon Hill. 



MEGASPIRA, Isaac Lea, 1839. 

 Megaspiea cylindeica, n.sp. 



Megaspira cylindrica (Edwards MS.), J". S. Gardner. — Gcol. Mag. 

 1885, p. 251. R. B. JS^ewton. — Syst. List Edwards Coll. British 

 Museum, 1891, p. 274. 



fShell elongate, cylindrical and tapering; whorls /•< 



flattened, gradually increasing and separated by a 

 moderately deep suture ; body whorl angulate at 

 the shoulder ; ornamented with slightly undulating, 

 oblique and closely set longitudinal striations which 

 terminate at the angulation of the last whorl ; base 

 smooth or only obscurely striated ; columella fur- 

 nished with three nearly transverse lamellar plications, 

 beneath which is a clearly defined parietal ridge 

 having the appearance of being flanged posteriorly. 

 Alt. 11 mm. ; diam. 4 mm. 



This species is founded on a unique specimen, 

 though unfortunately imperfect. Only six whorls 

 are preserved, and the aperture, filled with iron 3iennspira 



pyrites, is much fractured. The columellar characters cylindrica, n.sp. 

 and the position of the parietal plication are, however, 

 sufficient to relegate it to the genus Megaspira, which has for its type 

 M. Ruschenbergiana, Jjea=:Fupa elafior, Spix. Its nearest analogue is 

 the M. elongate of Melville, from the Lower Eocene of the Paris Basin. 

 Our specimen differs from that form, however, in its larger and less 

 oblique columellar plications, as well as in its bearing more boldly 

 defined longitudinal striations. Since Edwards' identification of this 

 specimen in MS., Mr. J. S. Gardner has referred to it briefly in the 

 Geol. Mag. for 1885, but without description or figure. 



The occurrence of this genus, a land-shell, in a marine formation 

 like the London Clay is additional evidence of the proximity of 

 terrestrial conditions during the deposition of those beds. In further 

 confirmation of this we may refer to the vegetable remains, etc., found 

 in the London Clay at Sheppey, and to the two rare Mollusca from 

 strata of the same age, viz. Amphidromus \_Buli)mis~\ te^iuistriattis, 

 G. B. Sowerby,^ discovered at Primrose Hill, and Camptoceras prisciim, 

 Godwin-Austen,^ from Sheerness, a land and a fresh-water genus 

 respectively. 



Formation. — Eocene (London Clay). Locality. — Finchley. 



1 Ann. Soc. R. Mai. Belgique, 1889, vol. xxiv. p. 359, pi. xii. fig. 23. 



" Loudon Geol. Journ. 1846, p. 20. 



■' Quart. Jnuru. Geol. Soc. 1882, vi>l. xxxviii. p 220, jil. v. figs. 1-7. 



