Williston.] Turtles. 359 



Pectoral Girdle and Extremity. 



The bones of the pectoral girdle and extremity preserved 

 were found so little distorted from their natural position that 

 their mutual relationships are assured. The scapula and cora- 

 coid were found between the carapace and plastron, near to- 

 gether. L part of the coracoid has been lost, but the inner end 

 was lying in apposition to the inner end of its mate. There is 

 one nearly complete humerus preserved and close to the lower 

 end of both were the bones of the forearm and the metacarpal 

 bones which are figured. Unfortunately, the single bone fig- 

 ured as carpal or tarsal had bee?i separated from the matrix 

 and its position is unknown. The four bones of the metacarpus 

 were lying nearly in position, the two inner ones crossed over 

 each other. Lying across them, and undoubtedly belonging 

 with them, is the fifth bone. 



Scapula. 



The scapula-proscapula is preserved complete, and shows 

 but little distortion or compression. The humeral neck is mod- 

 erately constricted, and is longer relatively than in Protostega. 

 The two extremities are flattened oval in cross-section near the 

 base, with rounded margins. The proscapula is shorter than 

 the scapula, and is flattened and a little dilated at the distal 

 extremity. The scapula is slightly widened distally, and ends 

 in an obtuse point, with two shallow emarginations before the 

 tip on the inferior border, and one on the upper border, sep- 

 arated by rounded prominences. The angle of the scapula with 

 the proscapula a little less than a right angle. 



Width of neck , 42 mm. 



Width of articular extremity 56 



Length of proscapula to inferior border of scapula 82 



Width of proscapula distally 34 



Length of scapula to inferior border of proscapula 158 



Greatest width of scapula distally 32 



Least width of scapula 27 



Distance between extremities of scapula and proscapula 175 



Thickness of proscapula at proximal end 9 



