Art. XII. — On the Fossil Eye and Teeth of the Ichthyosaurus 

 Australis, (M'Coy), from the Cretaceous formations of 

 the source of the Flinder's River ; and on the Folate of 

 the Diprotodon, from the Tertiary Limestone of Lime- 

 burner's Point, near Geelong. By Professor M'Coy. 

 [Read 30th July, 1868 ] 

 Mr. Carson, of Collins-street, has recently presented to the 

 National Museum several important additional fragments of 

 the first discovered Enaliosaurian fossil reptile of continental 

 Australia, to which I gave on a former occasion the name 

 Ichthyosaurus Australis ; and these, with the previous 

 donations of Messrs. Sutherland and Carson, enable me to 

 bring before the Royal Society this evening some interesting 

 additions to our knowledge of the most interesting fossil 

 animal yet found in this country. 



In the two portions of the head now on the table, 

 the two remarkably characteristic bones of Ichthyosaurus, 

 the sup <er 'squamosal and the postorbital, not present 

 in crocodiles, are visible ; and what is probably of 

 more popular interest, the enormous eyes with their 

 bony sclerotic coats are finely preserved. The eyes in 

 this species measure (5 J) five and-a-half inches in antero- 

 posterior diameter, and the pupillary opening is little less 

 than (2) two inches. It is not possible to be certain of the 

 number of pieces into which the sclerotic is divided, but it is 

 apparently about (IS) thirteen, (there are seventeen in the 

 European /. communis) 



Some of the bones now exhibited prove this species 

 to have been one of the largest of the genus, one 

 individual being from analogy, (25) twenty-five feet in 

 length. The series of dorsal vertebras exhibited with double 

 articulations for the head and tubercle of the ribs on each side, 

 are nearly (4) four inches in diameter, and the elastic 

 capsule intervening between the doubly concave articular 

 faces are well preserved. 



The next portion of this curious fossil not previously 

 known is one of the paddles. It has (8) eight rows of 

 phalangeal bones, and as one edge is imperfect, it may have 



