130 J. S. GARDNER ON BRITISH CRETACEOUS NUCULIDZ. 
Neocomian species. 
Noucurta Meyer, sp. nov. Plate V. figs. 14-16. 
This appears to be a small species, nearly triangular, very ke 
in proportion to its length, and deep relatively to the other Neo- 
comian species. The ambo is small, the anterior margin slightly 
produced, and the inferior margin greatly curved and almost cres- 
centic in outline. It is striated with lines of growth, but has no 
pectinate structure, and the margin is consequently entire. The 
lunule is large and moderately well defined, and there are no very 
deep furrows on the test. I possess two specimens from Ather- 
field, which were found with NV. simplex and N. Cornueliana; and 
Mr. Meyer possesses one from Shanklin. The species are named in 
compliment to Mr. Meyer, F.G.S., whose work in’ the field has so 
ereatly enriched our British Cretaceous fauna. It is most nearly 
allied to VV. empressa of Blackdown. 
Subdivision OvAT# RETICULATA. 
Gault Spectes. 
There are very few sculptured forms belonging to the group 
‘“* Ovate,” and these are confined to the Gault. They are reticulated, 
and the lip is apparently notched or toothed internally. 
NvUcULA ARDUENNENSIS, var. PUMILA, d’Orb. sp., Pal. Frang., Terr. 
Crét. vol. ii. p. 174, pl. 302, figs. 4-8 (1843). Plate III. 
figs. 19, 20, 20a, 21. 
Our variety is very much smaller than that described by D’Orbigny, 
barely reaching a third of the dimensions given by that author. It 
has the characteristic form of the Ovate, with an inconspicuous 
lunule, but is finely ribbed and striated by transverse lines of 
growth, their intersection forming a regular and delicately reticu- 
lated ornamentation. It has, like WN. ovata, occasional deep 
furrows parallel with the inferior margin. The test is thick and 
nacreous internally, and the umbos generally abraded. The longi- 
tudinal strise seen rather more conspicuous, and the form less ~ 
angular than D’Orbigny’s description would lead one tosuppose; but 
having examined his original specimen I can see no reason to separate 
the Folkestone form, except on account of its minute size. D’Orbigny’s 
specimens were found in the Gault of the Ardennes; and in England 
it appears to have a restricted range in the Lower Gault of Folke- 
stone. 
Casts of a large and undetermined species, agreeing with 
D’Orbigny’s description, are by no means rare at Cambridge, and 
may possibly belong to D’Orbigny’s species. A large specimen is 
figured, Plate IV. fig. 23. 
