30 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 22, 



Pleuromya unioides, Roemer, 1S36. 



Venus unioides, Roemer, Norddeutschen Oolit. t. 8. f. 6. p. 109. 

 Pleuromya unioides, Agassiz, Etudes Critiques, Pleuromya, p. 236. 

 t. 27. f. 9-13. 



The single specimen before me from the Pabba-shales so closely 

 resembles the same species from the Capricornus-bed of the Middle 

 Lias, and likewise from the Margaritatus-bed of the Marlstone, that 

 there can be no doubt of their identity ; it appears to be rare at 

 Pabba. 



AviCULA, Sp. 



In a fragment from Scalpa, with a portion of Pecten cequivalvis, 

 there is the interior of one valve of an Avicula ; but the species is 

 indeterminable. 



Cardinia concinna, Sowerby, 1819. 



Unio concinnus, Sowerby, Mineral Conchology, t. 223. 



Cardinia concinna, Agassiz, Etudes Critiques, Myes, 1. 12. f. 21,22. 



Six valves of this shell lie on a thin slab of greenish sandstone, 

 which came from beneath the coral-bed at Lussay ; the Cardinice 

 are mostly in the form of moulds, and on the under side of the slab 

 are similar impressions of the same shells. 



The specimens from Lussay agree much better with Agassiz' s 

 than with Sowerby' s figure. In Germany this species characterizes 

 the lower beds of the Lower Lias, in Wurtemberg. In France it is 

 found in the same strata in the Departments of Moselle and Cote 

 d'Or. 



Unicardium cardioides, Phillips, 1839. 



Corbula cardioides, Phillips, Geology of Yorkshire, t. 14. f. 12. 



The single valve of this species from the Pabba-shales agrees with 

 the type-forms of this shell found in such abundance in the shales of 

 the Middle Lias, beneath the Marlstone in Gloucestershire, and in the 

 same horizon in Robin Hood's Bay, Yorkshire. 



Pinna folium, Young and Bird, 1822. 



Pinna folium, Young and Bird, Geological Survey of the York- 

 shire Coast, t. 10. f. 6. 



Pinna inflata, Chapuis et Dewalque, Fossiles Ter. Second. Luxem- 

 bourg, t. 30. f. 1; 



Several specimens of this species, from the Pabba-shales, are in 

 the collection, which entirely agree with the Gloucestershire examples 

 of the same shell, and with those from Robin Hood's Bay, Yorkshire. 



Mytilus cuneatus, Sowerby, 1821. 



Modiola cuneata, Sowerby, Mineral Conchology, t. 248. f. 2. 

 Modiola scalprum, Phillips, Geology of Yorkshire, t. 14. f. 2. 



The three specimens of this Mussel are from the Pabba-shales ; 

 they are small imperfect examples of the species, but identical with 



