SIMOLESTES YOEAX. 25 



E. 3901. Three sclerotic plates, 



E. 3537. Vertebral centra, neural arches, ribs, and an ischium of a very young individual. 

 E. 2738. Left coracoid, nearly complete (text-fig. 5), comparatively little crushed. 

 The dimensions (in centimetres) are : — 



Extreme length 86-0 



Width opposite posterior angle of glenoid cavity 52*4 



Length of combined surfaces for scapula and glenoid cavity . 24 - l 



Depth of glenoid surface 8 - 5 



Greatest depth of thickened portion of glenoid surface . . . 7"0 

 Leugth from anterior angle of scapular surface to postero- 

 external angle 61'8 



Width from postero-external angle to symphysial border . . 38 - 5 



Genus SIMOLESTES, Andrews. 

 [Ann. Mag. Nat. Hist. [8] vol. iv. (1909) p. 424.] 



Pliosaurs in which the head is short and hroad ; mandible with deep massive rami 

 meeting in front in a short symphysis, extending back to the fifth or sixth tooth ; 

 about twenty-six closely crowded teeth on each side of the mandible : teeth 

 circular in section, without carina?, the enamel being raised into a series of fine 

 longitudinal ridges, some extending to the tip of the crown ; the ridges most 

 numerous on the inner (concave) side of the crown. Neck short, consisting of 

 about twenty vertebras, the centra of which are about as wide as high, while their 

 length is only about half as great. The shoulder-girdle and pelvis are much as in 

 Pliosaurus, but the humerus and femur seem to have been more definitely expanded 

 at their distal ends than in members of that genus. The humerus is the shorter of 

 the two. Ventral ribs were present. 



This genus is distinguished from Pliosaurus and Peloneustes by the shortness of the 

 snout and of the mandibular symphysis. 



Only one species is at present known, from the Oxfordian of England. 



Simolestes VOrax, Andrews. 

 [Plate III. ; text-figs. 8-10.] 

 1909. Simolestes vorcuv, Andrews, Ann. Mag. Nat. Hist. [8] vol. iv. p. 427, text-figs. 4-7. 



Type Specimen. — The greater part of a crushed skeleton (R. 3319), including the skull 

 (PI. III. figs. 1, 1 a), mandible (PI. III. figs. 1, 1 a), vertebral column (PL III. fig. 4), 

 pectoral girdle (text-fig. 8), except the clavicular arch ; both humeri (text-fig. 9, A), 

 right radius and ulna (text-fig. 9, A) and other paddle-bones, pelvis (text-fig. 10), 

 both femora (text-fig. 9, B), left tibia and fibula and other paddle-bones. 



PART II. E 



