J. S. GARDNER ON BRITISH CRETACEOUS NUCULIDA. 129 
D’Orbigny * describes a much larger species from the Neocomian 
under this name, but figures it as WV. Cornweliana (plate 300, figs. 
6-10). It is erroneous to include it in lists of Gault fossils, as 
is frequently done, its horizon being the Upper Greensand of Black- 
down, where it seems to be common. I believe, however, that 
the casts from the Grey Chalk of Dover are of the same species. 
It has often been quoted as a Lower-Greensand fossil, doubtless in 
mistake for V. planata or N. Cornueliana. 
Neocomian Species. 
Noucura Cornvetrana, d’Orb., Pal. Frang., Terr. Crét. vol. iii. pl. 300, 
fies. 6-10. Plate V. figs. 5-10. 
NV. wmpressa, VOrb. l. ¢. p. 165 (1843). 
This is a larger and broader species than JV. albensis, angular, 
elongate, and more symmetrical. The lunule is slightly larger, more 
defined, sunk, but seeming to project a little towards the centre. 
The anterior region is more or less produced in different specimens. 
The shell appears on the whole to be nearer to WV. impressa than to 
any other species, and it is in fact difficult to formulate any characters 
by which it can be readily distinguished, except that when well 
preserved, it is seen to be longer in proportion to its height and more 
produced anteriorly. Mr. Meyer has specimens from Shanklin, from 
the Atherfield Beds of Sevenoaks, and from the base of the Folkestone 
Beds of Nutfield ; and I have three specimens in most perfect preserva- 
tion from the ‘“‘ Cracker rocks” of Atherfield. The latter are young 
shells, but being the most perfect, have been enlarged for illus- 
tration. There are also examples from the Tealby Series of Benny- 
worth Haven, in the Woodwardian Museum, which differ some- 
what from the rest in their greater depth and less open angle. The 
species, though described by D’Orbigny as NV. «mpressa, is correctly 
figured as VV. Cornueliana. It is not always easy to distinguish it 
from JV. planata, but it is less ovate and more angular anteriorly, 
and slightly less compressed. 
Neocomian Species. 
Nucuta stmeLex, Desh., in Leym. Mém. de la Soc. Géol. vol. v. p. 7, 
pl. 9, f. 5 (1842). Plate V. figs. 11-13. 
This species differs from WV. albensis and the other Nucule of the 
group in the smaller development of the anterior region, which is 
somewhat abruptly truncated, and rounded, instead of rostrated, in- 
feriorly, so that the beaks almost overhang the anterior margin. 
The shell is nearly triangular, the inferior margin much curved, 
and the lunule small and ill defined. Mr. Meyer possesses it from 
Redcliff (Shanklin, Isle of Wight), Kast Shalford, and Sevenoaks, and 
I haye several specimens from Atherfield. ‘The latter, though small, 
are exceedingly perfect, and one is enlarged in figure 13, Plate V. 
* Terr. Crét. vol. iii. p. 165. 
Q.J.G.8. No. 157. K 
