OOLITIC BIVALVES. 
91 
giving* a somewhat bladdery appearance. 1 think it may be 
safely identified. 
0. gregaria, from the Kelloways Rock and Coral Rag, is 
too finely ribbed ; else it is a good deal like our shell in general 
character. 0. nQclosa, Goldf., has too many ribs. 
0. ACUMINATA —Sowerby. 
Plate 22, fig. 3. 
Mineral Concliology, plate 135, fig. 2. 
Exactly like the British fossils from Cornbrash, Great 
Oolite, Inf. Oolite, &c. The Bradford clay species, 0. 
Sovjerhyi, is a good deal like, but far too broad and too little 
curved. 
AVICULA INffiQUIVALVIS.-Soa’. 
Plate 22, fig. 13. 
Mineral Concliology, plate 244. 
Though the ribs are a little more spinulose, I still think 
these specimens may be identified. The chief point of differ¬ 
ence is that the ribs are somewhat rougher, and that there 
are no intermediate ones. In this respect it is like A. decns - 
sata , a species from the Lower Lias, but which has more 
numerous ribs. A. echinata, Sow., is too oblique a species to 
compare with ours. 
MONOTIS CONCENTRICUS.-Bto/orrf. 
Plate 22, fig. 4. 
Asiatic Soc. Journal, 1862, plate 4, figs. 6, 7. 
This remarkable shell reminds us at first sight of the small 
Inocerami of the Gault formation, and again, remotely, of 
the so-called Inoceramus clubius, Sow., of the Lias. 
But Mr. Blanford has detected, in specimens from the Spiti 
Pass, the characteristic sinus and anterior ear, and we have 
endeavoured to insert it in the figure (4 a ). 
