107 



union of the scapula and procoracoid. The coracoids are very elongate, 

 almost equal to the ribs, and not stouter except at the extremity. It is 

 expanded into an oblique head proximally. The shaft is flat; one edge thick- 

 ened or truncated; the other thin. The distal portion is scarcely expanded; 

 being more slender than in any recent Testudinate known to me. 



Measurements. 



M. 



Length of the scapula to the glenoid cavity 0. 213 



Width of the scapula proximally 0. 045 



Length of the procoracoid to the articular surface - 0. 103 



Width of the procoracoid distally - 0. 060 



Length of the coracoid 0.400 



Width of proximally 0.086 



Width of medially 0.047 



Width of distally 0.080 



The elongate coracoid resembles most, among recent Chelonians, the 

 marine genus Chelone; while the sessile glenoid cavity and short procoracoid 

 with open angle are entirely different. In these points, this genus is more 

 like terrestrial forms, as Testudo, or less like Emys. 



Both humeri are entirely preserved. They appear to have been some- 

 what flattened by pressure; but, when unaltered* they were, no doubt, flat, with 

 stout proportions. They have a globular head, with an immense trochanter, 

 which projects much beyond it proximally. The shaft is then much con- 

 tracted, and expands again distally to the broad and very convex articular 

 extremity. Opposite the narrow part of the shaft, the small trochanter 

 appears on the inner side, forming an elongate ala. The long axis of the 

 humerus is' not straight; the proximal and distal portions making an angle of 



li0° with each other. 



Measurements. 



M. 



Total length of the humerus (1 foot) straight 0. 300 



LeDgth of the humerus from the head 0. 298 



Width at the head 0.156 



Width of the head 0.073 



Least width of the shaft 0. 076 



Greatest distal width 0. 132 



Length of the basis of the little trochanter 0. 080 



Thickness at the shaft 0. 031 



The flatness of this element, and situation of the large trochanter in the 

 general plane, are characters of the Sphargididce. The great constriction 

 medially and expansion of both extremities remind one of the mosasauroid 

 humerus. 



