198 MARINE REPTILES OF THE OXFORD CLAY. 



Pubis: length 13-0 



■width of distal expansion 6 - 7 



length of straight symphysial border 5 - 2 



width of upper end 2 - 5 



Femur : length in straight line 3V0 



greatest width of head 5 - 



long diameter of middle of shaft 3 - 2 



First metatarsal : length 9-6 



E. 3541 (Leeds Coll. 146). An imperfect skull. 



The dimensions (in centimetres) of this specimen are : — 



Length of nasals 19'5 



Distance between nasals and premaxillse 3"8 



Least width between orbits 8'8 



"Width between outer angles of prefrontals 16-6 



Length of the frontal anterior to temporal fossa? 10 - 5 



Metriorhynchus brachyrhynclms, Deslongchamps. 

 [PI. XII. ; text-figs. 58, 59, 73 F.] 



1867. Metriorlu/nclius bracliyrltynehus, E. E. Deslongchamps, Notes Paleontologiques, p. 333. 



Type Specimen. — A skull from the Oxfordian beds of Calvados (Normandy) described 

 and figured by E. E. Deslongchamps in 'Notes Paleontologiques' (1867), p. 333, 

 pi. xxiii. fig. 1 a-d. 



Skull (PI. XII.) with short rostrum, in which the nasals meet, or nearly meet, the 

 premaxillse. The outer angles of the prefrontals are about right angles, and the 

 supraorbital notch forms an acute angle. The posterior angles of the nasals are 

 considerably in front of a line joining the outer angles of the prefrontals. The 

 sculpture on the frontals is only slightly developed, but on the prefrontals, and 

 especially on the processes of the nasals external to the prefrontals, it is strongly 

 marked. There are twenty-one or twenty-two teeth on each side of the upper jaw ; 

 the crowns of the teeth are stout and moderately compressed, and the posterior carina 

 is more strongly marked than the anterior one ; the enamel is nearly smooth. 



The skull in this species was described in detail by E. E. Deslongchamps in ' Notes 

 Paleontologiques' (1867), p. 333, and more recently by Mr. E. Thurlow Leeds in the 

 Quart. Journ. Geol. Soc. vol. lxiv. (1908), p. 345. The last-named writer has given 

 a good account of the palate, which in this species is better preserved than in any 

 other, probably on account of the relatively greater massiveness of the bones. Except 

 perhaps a few vertebrse (see below, P. 3939), nothing is known of this species except 

 the skull. 



