162 MAEINE EEPTILES OP THE OXTOED CLAY. 



of the shaft is likewise rugose. Distally the bone is expanded to a smaller degree than 

 the humerus, and so far as is known it articulated with two bones only, the tibia and 

 fibula. 



The tiUa (PL VIII. fig. 4, t.) is somewhat larger than the fibula ; its surface for 

 union with the femur is gently convex, as also is its preaxial border. Postaxially it 

 unites with the fibula at its upper and lower ends, the two bones being separated in 

 the middle by a rounded opening ; distally it has a long gently concave surface for 

 the tibiale, and making an obtuse angle with this a short facet for the intermedium. 



The Jibula (PL VIII. fig. 4,/'.) has a long straight proximal facet for the humerus ; 

 anteriorly it unites proxiraally and distally with the tibia, distally it unites with the 

 intermedium in front, and behind has an oblique facet, which no doubt carried the 

 fibulare. The rest of the hind paddle is not known. 



R. 3539 (Leeds ColL 39). Disarticulated bones of skull (text-figs. 72-75), mandible (PI. VIII. fig. 1), 

 cervical (PI. VIIL fig. 8), pectoral (PI. VIII. fig. 7), five dorsal (Pi. VIII. figs. 5, 6) and 

 two caudal vertebrae ; numerous dorsal and ventral ribs ; shoulder-girdle (text-fig. 76), 

 including coracoids, scapulaj, clavicles and interclavicle (PI. VIII. fig. 3) ; fore 

 paddles (text-fig. 77) (incomplete) ; one pubis ; hind paddles (PI. VIII. fig. 4) 

 (incomplete). Type specimen described and figured in Ann. Mag. Nat. Hist. [8] 

 vol. iv. (1909) p. 419. 



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



SkuU (text-figs. 72-75) : 



Length of basioccipital 3-4 



Width of basioccipital at lateral processes 4-2 



„ occipital condyle 1-9 



Length from condyle to anterior end of parasphenoid . . . 8-S 



Approximate length of pterj-goids 15-5 



Extreme length of mandible 25-0 



Width of articular surface for quadi-ate 2-4 



Length of symphysis (approx.) 3-5 



Approximate length of crown of largest mandibular tooth . 2-9 



Width at base of largest mandibular tooth 0-6 



Vertebrae "1 Atlas and Second Sixth Twelfth Eighteenth ^"'^"ty- pirst 



(PI. Vm. figs. 5-8) J axis. cervical, cervical, cervical, cervical. '"''T'" pectoral Dorsal. 



cervical. ^ 



Length in mid-ventral fine . 4-0 2-3 2-3 2-S 3-0 3-1 3-4 3-7 



Width of anterior face of 



centrum 2-0 2-5 £-8 3-5 4-1 4-4 5-0 4-9 



Height of anterior face of 



centrum 2-1 2-2 2-3 2-8 3-4 3-5 3-8 4-3 



Height to top of neural 



spine 5-2 5-7 7-4 9-7 10-5 13-0 ]3-7 



