76 MAEINB EEPTILES OE THE OXEOED CLAY 



numerous separate neural arches, cervical, dorsal, sacral, and caudal ribs, fore paddles, 

 ilia, hind paddles. The skull is covered with serpula?, which seem to indicate that it 

 was exposed on the sea-bottom for some time before becoming embedded in the 

 sediment. It is greatly crushed, and the same is the case with the mandible, in which 

 the lateral compression has much deepened the rami, thus giving the jaw a very 

 different appearance from the mandible figured by Phillips (see also text-fig. 27, B). 

 in which the compression is in the opposite direction. Four teeth are shown in 

 text-fig. 28. Most of the neural arches and the cervical and caudal ribs are separated 

 from their centra. 



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



Skull : length from occipital condyle to tip of snout . . . 95 - 

 length from anterior end of pineal forameu to tip of 



snout 71-0 



width where the maxillo-preniaxillary suture crosses 



the alveolar border (approx.) 9-5 



Mandible: length 116-0 



„ of symphysis (approx.) 25-5 



„ of postarticular region 9-2 



depth at coronoid process 16-8 



,, hinder end of symphysis 7"6 



Vertebra 



Length in mid-ventral line 

 Width of posterior face of 



centrum 6-7 7-4 8-4 97 8-2 



Height of posterior face of 



centrum 5-7 6-4 6-8 10-4 76 



Height to summit of neural 



spine 16-9 .. 22-8 



Humerus : length 44-5 



width of upper end 12-4 



,, shaft at narrowest 10-6 



,, distal expansion 24-0 



Ilium: length 31-0 



„ of upper border 16-8 



width of shaft at narrowest 5 - 8 



„ articular end 11-2 



Eemur : length o5 - 5 



width of upper end 17 - 5 



„ shaft at narrowest 1T5 



,, distal expansion 28 - l 



R. 2445 (Leeds Coll. 9). Basioccipital, one exoccipital, atlas, axis, and the centra of thirteen other 

 cervicals, all wanting the neural arches and ribs, numerous separate cervical ribs, 



* The errors due to distortion are very considerable, especially in the skull and mandible. 

 t These measurements are only approximate. 



Atlas t 



Anterior 



Posterior 



Middle t 



Anterior 



and axis. 



cervical. 



cervical. 



dorsal. 



caudal. 



9-5 



4-0 



4-6 



5-5 



4-0 



