FOSSIL FAUNA. 147 



PLATE LXIV. 



Fossil Shells. 



Fig. 1 . A perfect speciiBen of one valve, showing the character of the hinge of Cucullcea decussata, 

 of Parkinson. London clay. Heme Bay. 



Fig. 2. Interior view of Gmssatella tumida, of Lamarck. Eocene strata, Paris. 



Fig. 3. Cardium Hillanum, of Sowerby. A beautiful silicified bivalve from Blackdown. 



Fig. 4. Nucula ovum, of Sowerby. A common bivalve, in the Lias, Yorkshire. 



Fig. 5. Inner view of Cyrena deperdita, of Parkinson. Plastic clay, Woolwich. 



Fig. 6. Lima gigantea, of Sowerby, from Lyme Regis. This is a young and small specimen 

 of a large bivalve that occurs in great perfection in the Lias. 



Fig. 7. Cardinia Listeri, of Sowerby. From the Lias, Gloucestershire. 



Fig. 8. Cast of a bivalve ; genus uncertain. 



Figs. 9 to 12. These fossils are the Trigonellites of Mr. Parkinson; and have since been 

 referred to a genus named Aptychus. Their true relations are very problematical. 

 Though found in pairs, there is no hinge or natural connexion. Some naturalists 

 suppose they may belong to the internal organization of Ammonites, because certain 

 kinds have been found collocated with particular species of that genus of Cepho- 

 lopoda. At present I do not think there is any satisfactory evidence as to their 

 real nature. Species occur in the Kimmeridge clay, and other subdivisions of the 

 Oolite formation. 



Figs. 9, & 1 2. Trigonellites lata, of Mr. Parkinson. 



Figs. 10, & 11. lamellosa. 



Figs. 13, <Sc 14. Corbida rewluta, of Sowerby. London clay, Highgate. 



Fig. 16. An imperfect specimen of Lmianassa (Mya) literata, from the fullers' earth of the 



Oolite, Wiltshire. 

 Figs. 15, & 17. Cardita senilis, of Sowerby. From the Eed crag of Suffolk. 



