MUEiENOSAUEUS PLATYCLIS. 



135 



This species was established by Professor Seeley on the evidence of the shoulder- 

 girdle only, but its skeleton differs in several other respects from those of M. leedsi 

 and M. durobrivensis. From the former it, like M. durobrivensis, differs in having 

 attained a much greater size and more massive proportions, and in possessing shorter 

 centra in the cervical vertebree, which, however, in the hinder region of the neck are 

 not quite so much shortened as in M. durobrivensis. In the anterior cervicals at least 



Text-fig. 69. 



Left humerus and left femur of Murcenosaurus platydh: A, humerus; B, femur. 

 (Type specimen, E. 2078, g nat. size.) 



//., facet for fibula ; 7s., head ; l.p., tuberosity ; m.r., ridge for muscle-attachment ; 

 r.f., facet for radius ; <./., facet for tibia ; tr., trochanter ; u.f., facet for ulna. 



the centra are a little broader in proportion to their height than in M. durobrivensis. 

 As in M. leedsi, the longitudinal ridge on the side of the cervical centrum, above the 

 articular facet for the rib, is much more strongly developed than in 31. durobrivensis, 

 in which it may be completely wanting. Another point distinguishing the cervical 



