DESCRIPTION OF THE PLATES. XV 
Tas. XXXVILI. 
Fig. 1. Portion of the lower jaw of the Mosasaurus gracilis. 
la. A fragment of the upper jaw of Mosasaurus gracilis. 
2-5. Portions of vertebrae of Mosasaurus gracilis. 
6 & 7. Middle cervical vertebra of Plesiosaurus constrictus. 
8&9. Teeth of Plesiosaurus Bernardi. 
10 & 11. Pterygoid teeth of Mosasaurus gracilis. 
12. Crown of a tooth of a Leiodon. 
13. Tooth of Plesiosaurus constrictus. 
14. Fragment of a tooth of a Mosasauroid reptile. 
15. Fragment of a tooth of a Plesiosauroid reptile. 
16 & 17. Tooth of Polyptychodon interruptus. 
18. Series of vertebrze of Coniasaurus crassidens. 
19. Portion of jaw with teeth of Coniasaurus crassidens. 
19a. Crowns of teeth, magnified, of Coniasaurus crassidens. 
20. Upper view of alveolar process and teeth of Coniasaurus crassidens. 
Tas. XXXVIII. 
Fig. 1. Portion of the skull and anterior part of the vertebral column of the Dolichosaurus 
longicollis. 
2. Part of the lower jaw of the Dolichosaurus longicollis, magnified ; and ovtline of 
the same, natural size. 
3. Portion of lower jaw with a tooth of the Polyptychodon interruptus. 
4&5. Anterior portion of the skull of Pterodactylus conirostris. 
6. Portion of scapular arch of Pterodactylus conirostris. 
7. Metacarpal bone of the fifth digit of the fore-limb of a Plesiosaurus. 
Tas. XXXVIII*. 
Figs. 1 & 2. Upper view of the Palzastacus Dixoni. 
3. The fore-part of the carapace and a portion of the claw of the Paleeastacus Dixoni. 
4. A portion of the carapace and two claws of the Palastacus Dixoni. 
5. Side view of the Paleastacus Dixoni. 
6 & 7. The pincer-claws or ‘ chele’ of the Paleastacus macrodactylus. 
8. Part of the carapace of a Crustacean. 
9. The carapace of Platypodia Oweni. 
10. Portion of the carapace of a Crustacean. 
11. The claw of a Grapsoid Crustacean. 
12. Five legs of the same side of a Grapsiform Brachyurous Crustacean. 
