86 



Presents. 



[Feb. 3, 



III. " On Proterosaurus Speneri (von Meyer)." By H. G. 

 Seeley, F.R.S., Professor of Geography in King's College, 

 London. Received February 3, 1887. 



(Abstract.) 



The author gives an account of the scientific history of Protero- 

 saurus, and states the interpretations of its structure given by Cuvier, 

 von Meyer, Sir R. Owen, and Professor Huxley. 



In Part II he describes the type specimen in the Museum of the 

 Royal College of Surgeons. In the skull characters are given of the 

 cerebral cavity, the supra-occipital, parietal, frontal, pre-frontal, 

 nasal, and premaxillary bones. A restoration is made of the skull and 

 the teeth are shown to be anchylosed to the jaw. On the palate the 

 vomer, palatine, and pterygoid bones are described and shown to have 

 all been armed with minute teeth. The pterygoid bone was strongly 

 united to the quadrate bone. The lower jaw and hyoid bones are 

 also described. 



In the vertebral column a description is given of the second to the 

 seventh cervical vertebrae, of sixteen dorsal vertebras, two sacral 

 vertebras, and twenty-three caudal vertebrae. 



The femur, tibia and fibula and foot are also described. The skin 

 is found to have been defended with a bony armour. 



In Part III comparison is made between the type and other 

 specimens which have been referred to it, with the result that some 

 are regarded as indicating different species while others indicate 

 different genera. 



In Part IY a comparison is made to show the resemblances of 

 Proterosaurus with other reptiles, in the several regions of the 

 skeleton; with the result that the Proterosauria is regarded as a 

 distinct division of the Reptilia, showing resemblances to many of 

 the highly specialised orders and to some low types. 



Presents, February 3, 1887. 



Transactions. 



Baltimore : — Johns Hopkins University. Studies in Historical 

 and Political Science. Fifth Series. Nos. 1-2. 8vo. Baltimore 

 1887. The University. 



Christiania : — University. Om Humanisten og Satirikeren Johan 

 Lauremberg. 8vo. Christiania 1884 ; Antinoos, eine Kunst- 

 archaologische Untersuchung. 8vo. Christiania 1884 ; Lakis 

 Kratere og Lavastromme. 4to. Kristiania 1886 ; Gorges Yaext- 

 rige. Bind I. 4to. Christiania 1885. The University. 



