of the Chlam^phorus truncatus. 551 



under parts of the caudal vertebras, giving great power to the 

 tail, which is probably exercised in removing backwards the 

 loose earth accumulated under the belly of this burrowing ani- 

 mal by the action of the fore legs, and for which purpose the 

 expanded and flattened extremity seems well calculated. 



The scapula has its superior margin straight, ending in a notch 

 of great size ; the base rounded ; the inferior margin concave, 

 and the posterior inferior angle considerably elongated ; the 

 coracoid process but little produced, the spine elevated, the 

 acromion very long, passing forwards, downwards, and inwards, 

 over the head of the humerus, to be articulated to a long and 

 slender, but perfect clavicle. There is a second spine of smaller 

 size parallel to, but beneath, the true spine. The humerus is 

 three-fourths of an inch in length, large and broad ; the deltoid 

 crest pi'ominent; between which and the external condyle a 

 deep groove is formed for the lodgement of muscles, &c. ; both 

 condyles very much elongated transversely ; the inner condyle 

 perforated above ; the edge rising from the external condyle 

 acute. The radius small, and seven-sixteenths of an inch in 

 length ; the ulna flattened, concave upwards, the olecranon nearly 

 as long ^s the ulna, horizontally flattened also, and presenting a 

 superior concave surface, ending in a curve pointing downwards. 

 The feet furnished with sesamoid bones for the insertion of the 

 tendons of the flexor muscles. 



The femur thirteen-sixteenths of an inch long, large and 

 strong ; the length of the neck considerable ; the great trochanter 

 elongated backwards beyond the line of the articulation of the 

 head of the femur with the acetabulum, and ending in a tube- 

 rosity ; the lesser trochanter directed downwards ; a third tro- 

 chanter projecting from the outer side of the shaft of the femur 

 somewhat above the middle ; the condyles moderately elongated 

 transversely, the outer having a crest directed backwards. The 

 tibia and fibula fifteen-sixteenths of an inch, flattened, concave 

 inwards, firmly anchylosed at each extremity, and arched in 

 opposite directions, giving an appearance of great size and 

 strength to the leg. The os calcis elongated backwards, flat, 

 and ending in a curve slightly inclined upwards. Hind feet 



