394 Mr. R. Bullen Newton on a Marine 
valve of evidently a young form, with a depressed oblong 
summit-region, an excavated inner lateral margin, and a basal 
region of considerable width. Some fourteen or fifteen 
prominent coste are present, divided by wide, deep, and 
angulate furrows, the coste being more or less vertical at 
first, but afterwards dichotomizing and pursuing a radial 
course to the lateral and ventral regions, forming V-shaped 
angulations in front. Fine concentric vertical growth- 
laminations cover the surface of the valve. 
Dimensions. 
mm 
PACIONE awe. ss 54s ek nena hen 82 
POR i teen or ale Mae 28 
Diameter... 47405 4. PEAR AT 9 
Distribution. Sequanian to Kimeridgian: Britain and 
Burope. . 
Locality. Ashaira. 
Gryphea cf. dilatata, J. Sowerby. 
Gryphea dilatata, J, Sowerby, Mineral Conchology, 1816, vol. ii. 
pl. exlix. fig. 1, p. 113. 
Specimen represented by a moderate-sized, hemispherical, 
lower valve of the genus Gryphea, which is apparently 
related to J. Sowerby’s G. dilatata. It is of rounded contour 
with a well-excavated lateral lobe, while the surface bears 
several more or less distant concentric growth-furrows. As 
the specimen is attached to its matrix, all internal characters 
are hidden, besides which the margins are a good deal 
fractured. 
Dimensions. 
mm. 
LET eee ae abe. Sen 35 
Bengt inte asenuvens sens 48 
Distribution. Callovian to Sequanian: Britain and Hurope. 
Locality. Bachain. 
Exogyra bruntrutana (Thurmann, P. de Loriol). 
(Pl: XI. fig. 6.) 
Ostrea bruntrutana (Thurmann), P. de Loriol, Mém. Soc. Linn. Nor- 
mandie, 1872, vol. xvi. p. 399, pl. xxiv. figs, 7-18. 
Exogyra imbricata, H. Douvillé, Bull. Soc. Géol. France, 1886, sér, 3, 
vol. xiy. pl. xii. figs. 8, 9, pp. 280-232 (non Krauss) ; Miiller, Born- 
