NEW PERMIAN VERTEBRATE-. 249 



Pectoral Girdle. The pectoral girdle lies almost perfectly in 

 position, the hind end of the interclavicle only, turned slightly to 

 the right, and the right coraco -scapula pushed slightly forward, 

 or the left one backward. It is very certain that the girdle was 

 attached immediately back of the skull, the front part underlying 

 the occipital condyle even. In structure it is almost identical 

 with that of Labidosaurus, as figured by me. The position in 

 which they lie has slightly separated the clavicles at their scapula, 

 attachment. I find no indications of a cleithrum. It is very evi- 

 dent that the coracoids in life were in immediate contact along the 

 median line, covered over by the prolongation of the interclavicle. 

 The scapulae curve upward at an angle of about forty-five degrees 

 from the plane of the coracoids. Possibly this angle has been 

 reduced slightly by pressure, but I think not. The scapulas are 

 directed, not backward, as has been supposed, but obliquely 

 upward. 



Front Legs. The humerus is of the usual shape, expanded 

 proximally and distally in planes meeting each other at an angle 

 of sixty or seventy degrees. The bone, like all other parts of the 

 appendicular skeleton, is distinctly more slender than in Labido- 

 saurus. The radius is a rather slender bone, cylindrical at its 

 proximal, flattened and expanded at its distal extremity. The 

 ulna, much broader and thicker at its proximal end, has a dis- 

 tinctly produced olecranon, and the curvature of the rather slen- 

 der shaft in the middle is distinctly away from the radius. The 

 most of the forearm and foot of the right extremity are preserved 

 in the thinner block, the proximal ends of the radius and ulna in 

 the thicker close by the right pubis. The hand, as thrust for- 

 ward below the right mandible, is outspread and fully articu- 

 lated, the middle of the wrist somewhat depressed by the angle 

 of the mandible in the mud, slightly turning the distal end of the 

 ulna. The terminal phalanges were probably present or but 

 slightly dislodged, but their minute size has made it almost impos- 

 sible to detect and work them out from the hard matrix. The car- 

 pus clearly agrees in its chief features with the carpus of Labidosan- 

 rus " inasivus," as figured by Case and myself, save that the parts 

 were reversed in the figures. I give herewith a better figure of the 

 labidosaur carpus, which has been more completely removed from 



