PELONETJSTES PHILAECHUS. G7 



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



Length 72-0 + 



,, of symphysis 23-0+ 



"VVidth of symphysis at widest part 5*4 



„ „ narrowest part . . ... . . . 4*5 



,, of the articular surface 6 - 2 



,, hetween outer angles of the postarticvdar processes . . 15-4 



Sharp Collection. 



R. 2439 (Leeds Coll. 3). Portions of a skull and skeleton. The portions preserved are basioccipital, 

 quadrate, mandible, numerous teeth, atlas and axis, and eighteen other cervical vertebra?, 

 all wanting the neural arches and ribs ; also some centra of dorsal and caudal vertebra?, 

 a few cervical and sacral ribs, scapula?, ilia, and paddle-bones. 



In the mandible the bones are well preserved and distinct, so that the structure is 

 fairly clear. The atlas and axis (text-fig. 16) are beautifully preserved, all the 

 constituent elements, except the neural arch of the axis, being well preserved and 

 separate. The centra of the rest of the cervical vertebra? are likewise in a good state 

 of preservation and uncrushed, but the other vertebra? are very imperfect ; one sacral 

 rib preserved shows well the stoutness of these bones and the large size of their outer 

 articular end. 



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



Basioccipital: greatest length v ■ . . . . . 5 - 5 



. „ , width at lateral processes 8"4 



Quadrate; width of articular surface for mandible .... 6-3 



Mandible : 



Greatest length 75"5 



Length of symphysis 21-S 



"Width of symphysis at broadest point 5 - S 



„ --„ narrowest point 5-3 



Depth of ramus at coronoid angle 9 - 



Width of articular surface 6'8 



Length of postartieular process 5"S 



Vertebra Atlas. 



Length of centrum in mid-ventral line . . 2 - 5 

 Width of posterior face of centrum ■. . . 4-8 

 Height of posterior face of centrum-. . . 4 - 



Width of the first subvertebral wedge-bone 6-4 



,, second subvertebral wedge-bone 2-" 



Sacral rib : length 9 - 



width of proximal end 5'0 



„ distal end 3-7 



•2k 



Axis. 



3rd cervical. 



2-2 



2-9 



5-1 



5-3 



4-2 



4-5 



Middle 



Posterior 



cervical. 



cervical. 



3-4 



3-6 



6-6 



7-0 



5-4 



5-6 



