122 



SAUKOPTEKYGIA. 



short, with the anterior vertebrae large. Vertebras with the 

 arches and cervical ribs articulating to the centrum only by syn- 

 chondrosis, and with flat zygapophyses ; cervicals (fig. 38) with 

 very short centra, which in the anterior region carry two distinct 

 costal facets and have very slightly cupped terminal faces, but in 

 the posterior region have flattened faces and single facets ; dorsals 

 with flat faces and a forward overhang of upper part of centrum. 

 Centra of middle cervicals with subcylindrical terminal faces, but 



Bestoration of the pectoral girdle of Pliosaurus. Eeduced. sc, scapula ; 

 p.cor, ventral (precoracoidal) plate of do. ; gl, glenoid cavity; cor, coracoid. 

 The scapula is taken from No. 31933 (p. 143), and the coracoid from that of 

 P. evansi. 



those at the extremities of the series with the same faces trans- 

 versely elliptical ! . Pectoral girdle (fig. 36) of the general type of 

 that of Peloneustes (infra), the ventral plates of the scapulae either 

 meeting in the median line or perhaps separated by a small omo- 

 sternum ; coracoids apparently not produced in advance of glenoid 

 cavity. Ventral plates of scapulae large, broad, and flat, the dorsal 

 portion being relatively smaller than in Thaumatosaurus (infra). 

 In the pelvis the pubis nearly square ; ischia elongated (as in fig. 44). 

 In the adult the pubis may have joined the ischium to form an 

 obturator foramen. Humerus shorter than femur, and articulating 

 with only the radius and ulna, which are shortened, oblong, and 

 separated by a very small interval. 



1 This character is shown by some associated series in the Woodwardian 

 Museum, Cambridge. 



