OPHTHALMOSAUEUS ICENICUS. 69 



Some dlmensious (in centimetres) of parts of this skeleton are : — 



Basisphenoid : length 7'2 



greatest width 10-5 



Quadrate : length 14-5 



■width at neck 6-9 



Articular : length 6-0 



Atlas and axis : width 9-5 



height 8-4 



length (approx.) 3-3 



Clavicle : length in straight line (approx.) 36-0 



Scapula : length 21-5 



width of proximal expansion 14-5 



Coracoid : length 23-0 



width 19-2 



Humerus : length 16-6 



width of distal end 13-5 



Ischio-pubis : length 13-4 



width of proximal end 4-8 



R. 2138 (Leeds Coll. 64). Some fragments of a skull, including the basioccipital, basisphenoid, and 

 part of a quadrate, also the articular bones, associated with the atlas and axis, thirt}-- 

 seven other precaudal and forty-eight caudal vertebrae, three caudal ribs, and two 

 neural arches from the same region ; the imperfect scapulse and coracoids, both humeri 

 with the radii, ulnse, and pisiforms, as well as forty-two other paddle-bones ; one 

 ischio-pubic bone and one femur. The humeri both bear the distal tuberosity referred 

 to on p. 53, on their dorsal face ; their length is U'G cm., width of distal end 

 13'2 cm. The ischio-pubic bone is much shorter and broader than usual, and the 

 upper end is more enlarged ; the length is 11 cm., width of upper end 6"4 cm., width 

 of lower end 7*5 cm. The femur has a greatly enlarged bulbous proximal end, 

 apparently owing to the development of exostoses : its length is 9'1 cm., width of 

 distal end 5'9 cm. 



R. 2162 (Leeds Coll. 31). Bones of back of skull, including basioccipital (text-fig. 1), basisphenoid 

 (text-figs. 1 & 5), supraoccipital (text-fig. 2, C, D), right exocci[)ital (text-fig. 2, A, B), 

 right and left stapes (right, test-fig. 3, C, D), right and left opisthotie (right, text- 

 fig. 3, E, F), one pro-otic, left quadrate, right parietal (text-fig. 14). 

 The dimensions (in centimetr(;s) of some of these bones are : — 



Basioccipital : width of condyle 6-S 



total length 7'2 



„ width 8-S 



length of neural surface 4-5 



Exocclpital : height 3'5 



length of base 4-7 



