206 



bones of the second series. The first and fifth digits have each a metacarpal bone and two 

 phalanges, the second phalanx supporting a claw ; the first and second, and probably also the 

 third digits, have each had three phalanges. 



Hunterian. 



1084. The right scapula, coracoid, and anterior member of the same Emys, wanting 

 several phalanges. Hunterian. 



1085. The left leg and hind foot of the same Emys. Hunterian. 



1086. The right leg and hind foot of the same Emys. 



The hallux has two phalanges with a claw ; the next three digits have each three pha- 

 langes with a claw ; the fifth has two small and slender phalanges, and is clawless. The 

 astragalus and scaphoid form a single bone, but there is a distinct rudiment of a calcaneum : 

 the bones of the second tarsal row progressively increase in size from the tibial to the fibular 

 side ; the two representing the cuboid are distinct, the outermost is broad and flat, and sup- 

 ports the rudiment of the fifth toe. 



Hunterian. 



1087. The bones of the left anterior extremity of the green Turtle (Chelone mydas). 



The shaft of the humerus is compressed laterally instead of from before backwards, as in 

 the Tortoise. The ulna is much shorter and the olecranon less developed than in the Tor- 

 toise. The proportions of the scaphoides and lunare are reversed, the lunare being the largest 

 bone and the scaphoid divided into two, of which the part that articulates with the trape- 

 zoides and magnum is here ossified : the cuneiforme is a flattened bone of large dimensions, 

 and here also the pisifonne is well developed. The five bones of the distal row are distinct, 

 as in the Tortoise : that which answers to the os magnum is the smallest. In old Turtles it 

 is sometimes anchylosed with the fourth and fifth of the distal series, forming a single bone, 

 answering to both magnum and unciforme in the human wrist. 



Hunterian. 



1088. The bones of the right fore extremity of the same Turtle. 



In both these specimens the second phalanx of the pollex supports a claw : the three 

 middle digits have each three phalanges, the last being flattened and without a claw ; the 

 fifth digit has only two phalanges. 



Hunterian. 



1089. The bones of the left hind foot of the same Turtle. 



The proximal row of the carpus consists of two bones, the larger one answering to the 

 astragalus and scaphoides, the smaller one to the calcaneum ; the second row includes five 



