66 MARINE EEPTILES OF THE OXEOED CLAY. 



"Width of symphysis at widest . 5*8 



„ „ narrowest 5'1 



„ of articular surface for quadrate 5-3 



Length of postarticular process 5 - 8 



Width between outer angles of postarticular processes . . 20-0 



E. 2440 (Leeds Coll. 4). Imperfect skull and mandible, atlas, and the centra of nineteen other 

 cervical vertebra?, centra of about twenty-six dorsals and nineteen caudals, some cervical 

 ribs, numerous portions of the pectoral and pelvic girdles, and the fore and hind paddles 

 (text-fig. 23). 



The middle portion of the roof of this skull has been figured in Ann. Mag. Nat. Hist. 

 [6] vol. xvi. pi. xiii. fig. 3. 



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



Skull: 



Approximate length from vertex to tip of snout 64-5 



Length from pineal foramen to tip of snout 50-5 



Vertebra Middle Anterior 

 cervical. caudal. 



Length of centrum iu mid-ventral line .... 3*3 3 - 3 



Width of centrum 5 - 7 5'9 



Height of centrum 4'9 5 - l 



Humerus (text-fig. 23, A) : approximate length 35-S 



width of shaft at narrowest ... 8-1 



„ distal expansion (approx.) 16 - 4 



Eadius : length of preaxial border S-7 



■width at proximal end 8-3 



Ulna : greatest length 7-3 



width 8-3 



Femur (text-fig. 23, B) : width of shaft at narrowest .... 8 - 5 



,, distal expansion . (approx.) 18 - 5 



Tibia: length of preaxial border 104 



width at proximal end 9 - 2 



Fibula : length at postaxial side 9-5 



width at middle 8-2 



The other parts of the skeleton are too much crushed to supply any measurements of 

 value. 



47411. A mandible almost uncrushed and in a very good state of preservation; all the dental 

 alveoli are empty. The tip of the symphysis is broken away, so that exact measurements 

 of length cannot be given. The number of teeth on each side is about 32, of which 

 about 14 are in the symphysial region. This specimen has been figured by Lydekker 

 in Catal. Foss. Rept. Brit. Mus. vol. ii. (1889) p. 1 50, fig. 47 A. Also noticed by the 

 same writer in Quart. Journ. Geol. Soc. vol. xlv. (1889) p. 49, and in the Eec. Geol. 

 Suit. India, vo sxii. (1889) p. 50. 



