812 



5213. The second pair of ribs. 



The cervix is relatively longer, and the entire rib describes a greater curvature, than in the 

 Chimpanzee. It presents, also, a ridge and a groove on the upper part of the vertebral third, 

 which is not present in the Chimpanzee, and it is more flattened in the rest of its extent. 



5214. The seven succeeding pairs of ribs. 



These differ from those of the Chimpanzee in their greater thickness and breadth as com- 

 pared with their length, in their greater degree of curvature, especially at their vertebral or 

 proximal halves, and the greater production of the inferior margin, which forms a deeper 

 groove for the intercostal nerves and vessels. 



5215. The tenth pair of ribs. 



A rough ligamentous tract takes the place of the articular surface of the tubercle. The 

 rib is absolutely shorter than in the Chimpanzee, but is much broader and more curved. 



5216. The eleventh pair of ribs. 



There is no articular tubercle : the rib is shorter, broader, and more curved than in the 

 Chimpanzee. 



5217. The twelfth pair of ribs. 



These are much shorter than in the Chimpanzee, and are very little broader in proportion 

 to their length. They become narrower towards their sternal end, which shows a much 

 smaller surface for the articulation of the cartilage. They differ also, like the preceding, in 

 the absence of the articular tubercle, which is developed in the homologous rib in the Chim- 

 panzee. 



5218. The body of the sternum and the osseous piece supporting the ensiform car- 

 tilage. 



The elements of the body have coalesced and formed a bone broader, flatter, and more 

 compressed from before backwards than in the Chimpanzee ; it is also more expanded at its 

 lower half. The sternum of the Orang approaches nearer to the form of that of Man than 

 the sternum of the Chimpanzee does. 



5219. The right clavicle. 



The bone, besides its superior size, differs from that of the Chimpanzee in the more grace- 

 ful and complete sigmoid curvature. The sternal end is more thickened, and the articular 



