207 



bone* ; the three corresponding to the cuneiform bone* are very small, thr two which answer 

 to the cuboidM are very Urge ; that which support* the fifth digit stand* out like a broad 

 depressed roeUUnal. The three middle toe* hare each three phalange* ; the firtt and fifth 

 hare only two, and the first supports a claw. 



J/mt tenon. 



1090. The bones of the right hind foot of the same Turtle. H**teria*. 



1001. The bones of the fore-arm and paddle of a large Turtle (Ckekme my da*}. 



In this (penmen both portion* of the bone answering to the scaphoid in the Tortoise are 

 ossified, and the three outer bones of the distal row answering to the magnum and iincifonne 

 are partially confluent with one another : the large compressed pisifonne articulates in a tmall 

 proportion with the cuneiforme, but chiefly with the outer border of the uncifonne. 



//H/ift-riait. 



1092. The hones of the right hind leg and paddle of the same large Ckelone. 



llitnteria*. 



1093. The bones of the left anterior extremity of a Mud Tortoise (Trioiiyx Bi- 

 bromii). 



They are preserved with their natural connections. The carpal bones are in three rows, 

 the middle row being incomplete and formed by a divided ' scaphoides'; the proximal row is 

 formed by a large ' lunar*' wedged between the radius and ulna, a larger cuneiforme, and a 

 pinforme ; the distal row is formed by five bones, as in other ("kelonia. It is interesting to 

 ohsenre that the scaphoides, which articulates with the trapezium, trapecoides and magnum, 

 holds the same relative position in the carpus as the scaphoides does in the tarsus of Mam- 

 malia. The pollex has two phalanges, the last with a claw ; the three middle digits have 

 each three phalanges, but only the index and medius hare claws ; the fifth digit has two pha- 

 langes and has no claw. 



1094. The bones of the left posterior extremity of the same Trionyx, similarly pre- 

 pared. 



The proximal row consists of a tingle bone, answering to the astragalus, calcaneum and 

 ruboides ; the distal raw consists of five bones, of which the three cnneiformia are very small. 

 and the first concealed between the proximal tarsal bone and the first metatarsal. The two 

 divisions of the cuboides are very Urge, and the outermost dilated and angular. 



Prepared from the specimen pretexted by C'apt. 

 Sir Eoerard Home, R.N., F.R.S. 



