1&4<6.] STUTCHBURY ON A NEW PLESIOSAURUS. 4-13 



The Pterygoid, as seen from the inferior surface, remains nearly 

 in place, its posterior extremity being in contact with the articular 

 bone of the lower jaw. 



ft. in. lOths. 

 Length of the lower jaw from the anterior part of the muzzle to the 



end of the articular bones 2 8 



Inferior surface of the head from the muzzle to the basi-occipital. . . 2 5 



Ditto ditto to the anterior wall of the nasal openings 16 



Length of the symphysis of the lower jaw 5 6 



Breadth of the widest part of the muzzle 5 2 



Widest part across the occipital region 13 5 



Superior surface of the head; from the muzzle to anterior part of 



the nasal openings 9 6 



Antero-posterior length of the nasal opening 1 1 



Width of the nasal openings 5 



Distance between the nasal openings 1 1 



From the anterior part of the muzzle to the anterior wall of the 



orbit 11 5 



Columellar bone, length 5 7 



Ditto, diameter 6 



Cervical vertebrce. — Twenty-nine in number. 



Nos. 1 and 2 appear to be anchylosed. 



No. 3, antero-posterior diameter 1 2 



Distance between the inferior point of the nenrapophysis to the 

 superior margin of the articular facet for the reception of the 



cervical rib 5 



Vertical diameter of the articulating facet 7 



Nos. 4, 5, 6. Antero-posterior diameter 1 2 



Height or length of neurapophysis 2 2 



Nos. 7, 8. Antero-posterior diameter 1 2 



Nos. 9 to 13. Ditto ditto 1 4 



Nos. 14, 15. Ditto ditto 1 5 



No. 16. ' Ditto ditto 1 7 



Distance between the inferior point of the neurapophysis to 

 the superior maigin of the articular facet for the reception 



of the cervical rib 6 



Nos. 17, 18. Antero-posterior diameter 1 7 



Height or length of neurapophysis 2 6 



Height or length of spinous process above the neurapophysis... 1 H 



No. 19. Antero-posterior diameter 1 9 



Distance between the orifices of the vascular canals 8 



Nos. 20 to 26. Antero-posterior diameter 1 9 



Articulating facet distinctly separate into two, superior and 

 inferior. 



Nos. 27 to 29. Antero-posterior diameter 2 



Vertical diameter of the centrum of the vertebra 3 2 



The inferior surface of the ncurapopiiysis of the twenty-ninth 

 vertebra is extended outwards, forming a transverse process, carry- 

 ing part of the articulating facet. 



The inferior surface of tlie centrum of the cervical vertebrae is 

 subcarinated along the uu'dian liiu;. 



Tiie cervical rib or hatchet-shaped bone is most strongly charac- 

 terized at about the twentieth vertebra. 



The articulating facet for the attachment of the cervical rib is 



VOL. II. PART I. 2 K 



