xi. CETEOSAURUS FOOT-BONES. 285 



in Buckland's large handwriting the word ' Blechingdon," 1 which 

 is the nearest village to Enslow Rocks. The bone has been well 

 figured by Lyell (Manual of Geology, ch. xx.). 



The bone, incomplete at both extremities, length, 11-2 inches; 

 breadth at one end, 5-5; at the other 4* 75; greatest diameter of 

 shank, 3-3 ; no medullary cavity ; substance small-cellular. It might 

 agree either with a tibia of small dimensions, or a metatarsus 

 of large size; on the latter supposition, probably true, the bone 

 may be regarded as the first in rank of the three larger ones. It 

 would in this case offer some agreement with a corresponding bone 

 from Chipping-Norton. 



A series of six bones has come to us from Enslow Rocks, which 

 represents three metatarsals of each foot. The two largest appear 

 to be the first or innermost of the series ; the two slenderest are 

 regarded as third. Perhaps there were only three metatarsals, since 

 the specimens we possess exhibit opposite pairs of three, and no 

 more. 



The largest are frusta, shewing the proximal ends, 6'O inches 

 broad, 3'! deep; the shaft, 3*75 broad, 3-0 deep. These bones, 

 by the narrow slope for apposition on the second metatarsal, differ 

 much from that to be described from Chipping-Norton; they 

 differ equally by the much greater diameter of the shank. The 

 distal extremity is not known. 



The next in size and in position, also a pair, as well as can be 

 judged, of opposite sides, have the distal ends partly complete, 

 but the proximal ends wasted. One of these has a length of 14*25 

 inches (to which something must be added for the incompleteness), 

 the breadth of the distal end 5 inches, its depth 2*5 to 2'75 ; the 

 shank is 3-3 broad, and 2'25 to 2*5 deep; the articulating surfaces 

 have marks of cartilaginous attachments; the curved surface of 

 the distal end of one of the bones distinguishes the upper and lower 

 sides. The bone is cancellous throughout the interior, the cells 

 being extended in a longitudinal direction. 



The third pair of bones is of more slender shape ; the length, 14* 75 

 inches, must have exceeded 15-0 when perfect. Breadth near the 

 proximal end, 4-0 ; near the distal end, 3*5 ; in the middle of the 

 shaft, 2*5 ; depth at the proximal end, 2*5 ; at the distal end, 2-25 ; 

 in the middle, 2*1. 



These bones correspond in general form and place in the foot 



