70 MAEIKE EEPTILES OF THE OXFORD CLAT. 



Ilium (test-fig. 25, A) : length 17-8 



width of dorsal expansion 10 - 4 



„ middle of shaft 3"3 



„ articular end (the surfaces for 



ischi um and acetabulum taken together) 6 - 5 

 Pubes : width of surfaces for ischium and acetabulum taken 



together 14-0 



E. 2442 (Leeds Coll. 6). Portions of a skeleton including six cervical vertebrae, scapulfe, and 

 interclavicle, left ilium, and numerous paddle-bones. The vertebrae are much crushed 

 and distorted, and have lost their neural arches and ribs. The scapulae and interclavicle 

 (text-fig. 22) are well preserved ; they have been described and figured by Lydekker in 

 Quart, Journ. Geol. Soc. vol. xlv. (1889) p. 52, fig. 6, the interclavicle being regarded as 

 an omosternum ; the interclavicle has also been figured by Seeley in Proc. Roy. Soc. 

 vol. li. (1892) p. 131, fig. 4. The ilium is complete. 



The dimensions (in centimetres) of some of the above-mentioned bones are : — 



Scapula : length from hindmost point of posterior ramus to 



anterior end of ventral ramus 25 - 5 



width of expansion of ventral ramus 1T6 



,, middle of dorsal ramus 5'8 



,, articular enlargement 7*8 



Interclavicle (text-fig. 22) : length on middle line 11-4 



„ of anterior border (width) . 11*7 



„ of lateral border .... 13*0 



Ilium: width of expanded upper end ll - 6 



„ shaft at narrowest 4 - 7 



„ lower end (acetabular and ischial surfaces) . 8 - 5 



extreme length 20-8 



R. 1253. A considerable portion of a skeleton including the anterior part of the mandible, six 

 teeth (PL IV. fig. 5) and numerous fragments, several vertebral centra from the dorsal and 

 caudal regions, portions of ribs, portions of the pectoral and pelvic girdles, imperfect fore 

 paddles, and nearly complete hind paddles. This specimen was described by Lydekker 

 in Quart. Journ. Geol. Soc. vol. xlv. (1889) p. 48 et seqq., the mandible being figured 

 on pi. ii. fig. 1, a tooth in text-fig. 4, the restored coracoids in text-fig. 5, the restored 

 pubes and ischia in text-figs. 7 & 8, a part of a fore paddle in text-fig. 9, two vertebrae 

 on pi. ii. figs. 2 & 3. These text-figures are reproduced in Catal. Foss. Eept. Brit. 

 Mus. pt. ii. (1889) as text-figs. 49, 51-54. 



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



Mandible: length of symphysis 22-3 



Humerus : width of distal expansion 20-7 



Eadius : length of preaxial border 8-7 



„ humeral border 9-1 



Ulna : greatest width 9-6 



„ length 9-8 



Kempston, near Bedford.. Presented hy F. W. Crick, Esq., 1888. 



