421 



2328. The right humerus. It is perforated above the inner condyle. 



2329. The right ulna. 2330. The right radius. 



2331. The metacarpal and three phalanges of one of the toes, showing the extreme 

 shortness of the proximal phalanx, and the transverse perforation of the last 

 phalanx. 



2332. The right os innominatum. 



2333. The right femur, showing the large and deep cavity for the ligamentum teres, 

 and the great development of the three trochanters. 



2334. The right tibia and fibula. Their proximal and distal extremities are con- 

 nate : their shafts subsequently coalesce with these extremities, so that a single 

 epiphysis answers to the shafts of both bones at each of their extremities. 



2335. The astragalus, calcaneum and cuboides. 



Genus Orycteropus. 



2336. The skeleton of the Cape Ant-eater (Orycteropus capensis). 



The vertebral formula is : 7 cervical, 13 dorsal, 8 lumbar, 6 sacral, and 25 caudal. The 

 transverse process of the atlas is perforated longitudinally and grooved anteriorly by the ver- 

 tebral artery before it penetrates the neural arch, the perforation being half-way between the 

 anterior and posterior borders. There is a small spine upon the arch : the haemal spine of 

 the dentata extends backwards over that of the third cervical, which, with that of the sixth 

 cervical, is shorter than the rest. The transverse processes of the middle cervicals are deve- 

 loped forwards and backwards, and overlap each other. The costal part of that of the sixth 

 cervical is a distinct broad plate. The spines of the dorsal and lumbar vertebrae are all much 

 longer than those of the cervical, and are subequal : they slightly converge to that of the 

 twelfth dorsal, which is vertical, indicating a greater extent of inflection of the trunk than in 

 the great South American Ant-eater ; increased freedom of motion is likewise favoured by the 

 less complex character and mode of union of the vertebrae. An accessory tubercle is deve- 

 loped upon the diapophysis of the seven anterior dorsal vertebrae, which divides near the 

 eighth into metapophysis and anapophysis. These progressively increase and diverge from 

 one another in the succeeding dorsals, and in the first lumbar vertebra the metapophysis pro- 

 jects upwards, outwards and forwards upon the outside of the anterior zygapophysis ; whilst 

 the anapophysis extends backwards from the back part of the diapophysis, which it equals 



