64 CRETACEOUS LAMELLIBRANCHIA. 



Remarks. — Most of the English specimens have only a portion of the shell 

 preserved. I have collected examples from the Cenomanian of St. Catherine, near 

 Rouen (the locality of the types), which agree exactly with English specimens. 



Types. — Specimens from Rouen, but not the types, are in the d'Orbigny 

 Collection at the Museum of Natural History, Paris. 



Distribution. — Chalk Marl of Pinhay Cliff, Lyme Regis. Base of Chalk Marl 

 (zone of Schloenbachia varians) of Chard, Maiden Newton, Eggardon Hill, 

 and Titherleigh near Chard. Chloritic Marl of Maiden Bradley. Rye Hill Sand 

 of Warminster. Upper Greensand of Plush. 



Cuculljia, sp. Plate XIII, figs. 6 a, b, c. 



Cf. 1844. Arca Guekangeri, A. d'Orbigny. Pal. Franc. Terr. Cret., vol. iii, p. 228, 



pi. cccxviii, figs. 1, 2. 



— 1850. — — Prodr. de Pal., vol. ii, p. 1G4. 



— 1866. — F. J. Pictet and G. Campiche. Foss. du Terr. Cret. 



Ste. Croix (Mater. Pal. Suisse, ser. 4), pt. 3, p. 474. 



— 1871. — — F. StoliczJca. Palaeont. Indica, Cret. Fauna S. India, 



vol. iii, p. 343 (Trigonoarca). 



Description. — Shell oval or rhomboidal, high, convex. Anterior and ventral 

 margins curved. Posterior margin oblique ; postero-ventral angle rounded ; 

 antero-dorsal angle sharp. Umbones rather small, close together, placed near 

 the anterior third of the shell. Carina rounded. Hinge-area narrow. Orna- 

 mentation consists of very fiue radial ribs crossed by lines of growth. 



Measurements : 



Length ......... 58 mm. 



Height 47 „ 



Remarks. — The only example I have seen of this is a right valve in Mr. Meyer's 

 collection. It is similar to Area Guerangeri, d'Orbigny, but is less inflated. 

 Only a small part of the hinge is seen. 



Distribution. — Chalk Marl (Meyer's Bed 10) of Dunscombe. 



