634 ON THE CRANIAL CHARACTERS OP A TELEOSAUR. 



EXPLANATION OF PLATE XXIV. 



Teleosaurus eucejphalus. 



Fig. 1. Left side of skull, nearly in median line. 



2. Right side of skull, showing a section parallel to fig. 1. 



These figures are of the natural size. 



3. Lateral view of left side of same skull, greatly reduced. 



4. Superior view, reduced. 



5. Diagram of anterior end of fig. 1 (reversed). 



In all the figures the lettering is the same : — 8o, supraoccipital ; Bo, basi- 

 occipital ; Bs, basisphenoid ; jps, presphenoid ; Va, vagus nerve ; FM, foramen 

 magnum ; Eo, exoccipital ; P, parietal ; Eu, Eustachian tube ; TA, tympanic 

 air-cell ; V, outlet for fifth nerve ; cc, carotid canal ; ah, alisphenoid ; po, pro- 

 otic bone; Q, quadrate bone; C*" , cerebellum ; o, optic lobes; C, cerebrum; 

 olf, olfactory nerve ; op, optic nerve ; p/, pituitary fossa ; ?, posterior semicir- 

 cular canal ; ?', anterior semicircular canal. 



Discussion. 



Mr. Charlesworth mentioned that the Earl of Zetland had 

 presented another interesting specimen of a Sanrian to the York 

 Museum, which was described hy Prof. Phillips under the name of 

 Plesiosaurus Zetlandicus ; but M. Deslongchamps regards it as so 

 peculiar in its characters as to entitle it to form the type of a new 

 genus. 



The President thought, with Mr. Charlesworth, that the specimen 

 in the York Museum does not belong to the genus Plesiosaurus. 



