Maryland Geological Survey 197 



foramen has been broken away, but the beginning of a depression leading 

 into it is visible. The distal end of the scapula (No. 2512, G. 0.) is 

 not distinctive. 



Length of coracoid 133 mm. 



Thickness at glenoid surface 58 mm. 



A humerus and a femur bear the same catalogue number, 2263, U. S. 

 JSTational Museum, and are of much the same general appearance and 

 color which may indicate that they pertain to the same individual, 

 despite Hatcher's remark that " no two bones or fragments of all that 

 material .... were found in such relation to one another as to demon- 

 strate that they belonged to the same individual." It may, however, 

 be safe to assume that they show the average relation of length that these 

 bones bear to each other in Pleurocoelus. Compared with the humerus 

 in Morosaurus, that under consideration appears more slender, especially 

 at the proximal end, with a less prominent deltoid crest. The distal 

 end is more rectangular when viewed from below than in Morosaurus, 

 but the olecranon depression on the posterior aspect is much deeper 

 and longer in Pleuroccdus. The bone is less straight, more of an elon- 

 gated S in the present genus, and is very much longer in proportion to 

 the femur than in Morosaurus. 



DIMENSIONS 



Length 363.0 mm. 



Width proximal end 117.0 mm. 



"Width mid shaft 54.5 mm. 



Width distal end 15.0 mm. 



The radius (No. 2263, U. S. National Museum) is apparently of the 

 average size. It is less curved than that of Morosaurus grandis and rela- 

 tively somewhat stouter. Its dimensions are: 



Length 300.0 mm. 



Width proximal end 76.4 mm. 



Width mid shaft 34.0 mm. 



The ulna is represented by No. 5673, U. S. National Museum, the 

 proximal half, and another unnumbered bone representing a distal half. 

 They do not appear, however, to pertain to the same specimen, as they 



