Miscellaneous . 319 



of tlu' intestinal canal, and demonstration of the food of the Ichthyo- 

 saurus, afforded b)- its petrified debris. Principal species of the 

 Ichthijosaurus, and their range in space and time. Osteological and 

 dental characters of the Plesiosauriis and Pliosmi.nis. 



Lectures VII. and VIII. {Thursday, April 'llnci, and Friday, 

 April 'J3rd.) 



Characters of the order Dinosauria. Osteology and dentition of 

 the principal genera : Megalosaurus, Ilylaosaiirus, and hjuunodoii. 



Characters of the Pterosauria, or winged Reptiles. Principal 

 species of the Pterodactyle, traced from the Oolitic to the Cretaceous 

 formations, where they become extinct. 



Lectures IX. and X. (Thursday, April 29th, and Friday, 

 April 30th.) 



Peculiarly modified vertebral column of the Crocodilia of the 

 Oolitic period, exemplified in the Teleosaurus, Poildlopleuron, Cetio- 

 saurus, and Streptospondylus. Dermal armour of Goniopholis. 

 Dentition of Geosaurus, Suchosaurus, and Polyptychodon. Insecti- 

 vorous Lizards of the Purbeck period : incidental notice of contem- 

 poraneous mammalia. 



Gigantic marine Lizards of the Cretaceous period : Mosasaurvs, 

 Leiodon : the small Dolichosaurus and other contemporaneous rep- 

 tiles, in which the proccelian type of vertebra is established. 



Lectures XI. and XII. {Thursday, May 6th, and 

 Friday, May 7th.) 



Oolitic Chelonia and Tertiary Reptiles. — Chelonia : 

 earliest indications of this order of reptiles afforded by foot-prints in 

 Triassic Sandstones. Marine Turtles of the Wealden : estuary species 

 of the extinct genera Pleurosternon and Tretosfernon of the Purbeck 

 beds. Turtles of the cretaceous strata. Extinct species of Trionyx, 

 Chelone, Emys, and Testudo of the tertiary strata. The gigantic 

 Colossochelys of the Himalayan tertiaries. 



Modern forms of Batrachia in the tertiary series : the Palceo- 

 batrachus and Palceophrynus. Gigantic extinct Salamander {Homo 

 diluvii testis of Scheuchzer) ; Cuvier's demonstration of its true 

 nature. Discovery of a similar existing reptile in Japan. Tertiary 

 Crocodiles, Alligators, and Gavials. 



The Meyelania, or gigantic Lizard of Australia. 



Order Ophidia. Earliest known fossil remains of serpents in eocene 

 tertiary strata. Vertebral characters of Palceophis and Paleryx. 

 Summary of the evidences of the cold-blooded Vertebrata in the past 

 periods of the earth's history, and comparison of the general nature 

 and numbers of the extinct and existing reptiles. Conclusion. 



We subjoin the following conclusion of the 4th Lecture, delivered 

 on the 26th of March, from the notes of the Professor : — 



" The conformity of pattern in the dermal, semi-dermal, or neuro- 

 dermal bones of the externally well-ossified skull of Polyjiterus, Lepi- 



