DESCRIPTION OF THE PLATES. 



PLATE XVI. 



Fig. 1. A specimen of Radiolites, copied from the work of Picot. 



2. The smooth valve of Corbula gallica. 



3. Anomia craniolaris from Bosc. 



4. Terebratulites triquetra. 



5. Terebratulites coarctata. 



6. The bony structure existing in a recent shell, resembling A. terebratula. 

 1. Bony structure in a recent shell, resembling A. lacunosa. 



8. Another specimen of Terebratulites triquetra. 



9. The upper part of Anomites producta of Mr. Martin, a . The beak of the shell. 



c. A cavity in the superior part of the shell. 



10. The under part of the shell, b. A depression receiving the beak of the shell. 

 1O*. A terebratulite, with a fissure in the upper shell. 



11. An imperforate shell, with an extraordinary internal structure. 



12. A patch of square scales of a fish from Dorsetshire. 

 IS. Another view of the spiral tute seen in Fig. 11. 



14. The internal surface of the flat semicircular valve of Calceola sandalina. 



15. The anterior 'part of the large valve of Calceola sandalina. a. The tooth in the 



posterior margin of this valve magnified, b. The reteporean surface of a part of 

 this valve. 



16. A fossil shell, possessing a large area belonging to the hinge, and a deep triangular 



depression. 



17. A fossil shell, with a still larger area, and a longer triangular depression. 



18. A stone, bearing an impression resembling some species of Anatifa. 



1 9. Coronulites diadema. 



20. The beak of a terebratulite, the cast of which is the hystcriolithes of the oryctologists. 



VOL. III. 3 P 



