PLESIOSAURID^. 127 



from the glenoid cavity to the middle of the median sym- 

 physis is 0,407 (16 inches) and the vertical diameter of 

 the ventral plate 0,300 (11*8 inches). 



Egerton Collection. Purchased, 1882. 



31801. The glenoidal portion of the left coracoid; from Shotover. 

 So far as can be determined, this specimen closely resembles 

 the fragments of the coracoids of No. 46796 ; and it also 

 approximates to the coracoid of P. evansi, figured by 

 Seeley in the ' Quart. Journ. Gcol. Soc' vol. xxxiii. p. 722 

 (as an ischium). The diameter of the humeral and scapular 

 articulations is 0,216 (8*5 inches), or slightly longer than 

 P. evansi. Purchased. About 1852. 



31927. A bone which is apparently the head of an ischium and 

 was probably associated with the preceding ; from Shot- 

 over. Purchased. About 1852. 



47324. The right humerus; from the Kimeridge Clay of Swindon. 

 The postaxial border of the distal extremity is imperfect ; 

 the length is 0,584 (23 inches). This specimen accords 

 very closely with the imperfect humeri of No. 46796, 

 and also agrees with the description of the corresponding 

 bone of the type skeleton given by Phillips on p. 352. 



Presented by the Directors of the 

 Swindon Bride and Tile Company, 1876. 



Teeth, of which some probably belong to the present form, 

 while others may be referable to P. macromerus. 



44600. A crushed tooth of medium size; from Swindon. The crown 



is relatively short. Presented by the Directors of the 



Swindon Bride and Tile Company, 1873. 



46329. The crown of a larger tooth ; from Devizes. This agrees 

 nearly in size with the lower tooth of the type specimen 

 figured in Owen's ' Odontography,' pi. lxviii. fig. 5. 



Canninyton Collection. 



46329 a. The crown of an equally long, but more slender tooth ; 

 from Devizes. Canninyton Collection. 



47958. The crown of a tooth closely resembling No. 46329, but 

 somewhat taller; from Shotover. 



Presented by the lion. 11. Marsha, n, 1877. 



40109. An imperfect smaller tooth ; from Shotover. 



