564 F. B. Loomis — New Mosasaur from the Ft. Pierre. 



ened, between which two surfaces the humerus is pinched into 

 relative thinness. The radial border of the humerus is the 

 shorter and is so concave as to be almost a notch ; the ulnar 

 border is slightly longer and not quite so concave. A strong 



Fig. 6. 



Fig. 6. The right scapular from the outer side. 1/4 nat. size. 

 Fig. 7. 



Fig. 



The left coracoid from the outer side. 1/4 nat. size. 



pectoral process rises a little to the radial side of the humerus 

 and extends three-fourths of the length of the bone ; the car- 

 tilaginous surface extending about to the middle of the humerus. 

 This is the most strongly developed pectoral process I have 

 seen recorded, being an exaggeration of the large one typical 

 of Platecarpus. 



The radius is the larger of the forearm bones. Its proxi- 

 mal end is greatly thickened opposite the middle- of the inner 



