PELONELTSTES EVANSI. 77 



portions of the coracoids. This individual, though large, is still young, judging from 

 the condition of the atlas and axis ; it is therefore possible that it may be a young 

 Pliosaur. 



In the atlas all the elements are separate and the centrum is not fused with that of 

 the axis ; this latter is fused with the second subvertebral wedge-bone, though the line 

 of union is for the most part distinct ; there are some indications that there may have 

 been a small third subvertebral wedge-bone between the axis and the third cervical. 



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



Basioceipital : transverse diameter of occipital condyle . . . 5 - 5 



vertical diameter of occipital condyle .... 4 - 

 width between outer angles of the lateral 



processes 10"2 



length (approx.) 7 - 5 



Atlas : length of the neural surface 3 - 7 



width of posterior face 5-7 



„ first subvertebral wedge-bone 6 - 3 



Axis : length of centrum 3"5 



width of posterior face of centrum 5 - 9 



height of posterior face of centrum 4 # 9 



Cervicals Middle. Posterior. 



Length of centrum on mid-ventral Hue . . . 3"4 4'2 



Width of posterior face of centrum 6-2 7-0 



Height of posterior face of centrum ..... 5-9 6 - 2 



K. 2437 (Leeds Coll. 1). Portions of a skeleton ; the parts preserved are : — atlas and axis with 

 seventeen other cervical vertebrae, some with the neural arches and ribs still in situ, 

 but apparently not yet fused ; two pectorals, twenty-four dorsals, and one caudal 

 (mostly wanting the neural arches), ribs, scapulae, coracoids, humeri, radii, ulnae, ilium, 

 pubes, iscbia, femur, tibiae, fibulae, numerous paddle-bones. 



The absence of any part of the skull makes it difficult to be certain that this ma}' not 

 be a small individual of Pliosaurus ferox. 



The vertebrae are nearly all too much crushed and distorted to give measurements of 

 any value. The approximate sizes of some of the cervicals are : — 



Atlas and axis. Cervicals. 



.a. 



Length in mid-ventral line . . . 9 - 3 - 9 3-9 



"Width of posterior face of centrum . . . 75 7 - 9 



Height of posterior face of centrum. . . 6-7 6-6 



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



Scapula : width of articular surface 10-3 



„ dorsal ramus at narrowest point .... 7 - 4 



Humerus : length 44 - 5 



width of proximal end (crushed) 1V7 



„ shaft at narrowest 9*7 



„ distal end 22"7 



