392 Mr. R. Bullen Newton on a Marine 
older whorls are of much the same dimensions, besides 
exhibiting a similar shape, depth, and more or less sloping 
sides divided by a central oblique sulcus parallel to the suture. 
Good published figures are available of this species, such as 
P. de Loriol’s* examples from French Corallian rocks, as 
well as Thurmann and Etallon’s ¢ form-of Roemer’s JN. gose, 
considered by P. de Loriol as synonymous with NV. desvoidyi, 
from the older Kimeridgian (Strombian) beds of Hanoverian 
Germany, which combines both external and internal cha- 
racters in the same specimen. The present fragments need 
not be confounded with the genus Cryptoplocus, which has a 
much more conically formed axis, considerably shallower 
volutions, and is, moreover, furnished with only a single 
columella plication, whereas the true Nerinea possesses more 
than one fold. 
Distribution. Sequanian to Kimeridgian: Hurope and 
Arabia. 
Locality. Bachain. 
PELECYPODA. 
Ostrea cf, montbeliardensis, Contejean. 
Ostrea montbeliardensis, Contejean, “Etude VEtage Kimmeridien 
Montbeliard &c.,” 1859 (from Mém. Soc. Emul. Doubs), p. 521, 
pl. xxvi. fig. 1. 
The specimen consists of a single lower valve of widely 
suboval contour, having a flattened base, a nearly vertical 
outer wall which gives considerable depth to the valve, while 
the muscular scar-impression is antero-central. ‘There appear 
to be no foliations present as in the typical form from the 
Kimeridgian of France, although in other characters the 
Arabian valve bears much resemblance to this species. 
Attached to the specimen are some examples of Lwegyra 
bruntrutana. 
Dimensions. 
mm 
Eee HEN: & Sie Patpeetas Ae 45 
Juengthit. ca. cn wmgateniere bss bites 38 
Depth tts, << ieee tee 17 
Distribution. Kimeridgian: France. 
Locality. Bachain. 
* Mém. Soc. Linn. Normandy, 1872, vol. xvi. p. 81, pl. vi. figs. 2-5. 
+ ‘Letbea Bruntrutana,’ 1861, pl. vil. fig. 38, p. 93. 
