96 MAN. AND APES. 



a number of prominences termed spinous 

 processes* These, in most apes, are differently 

 directed towards the two ends of the series, 

 so that they tend to converge towards a single 

 point in the back. They do not do so in man 

 and the latisternal apes, but neither do they 

 in Loins and its allies (Nycticebince). In 

 that the breast-bone, or sternum, is relatively 

 short, and composed but of two bones, man 

 agrees not so much with Troglodytes and Simla 

 as with the Gibbons ; and in the Siamang the 

 sternum is even shorter and broader relatively 

 than in man. 



The Orang exhibits a singular peculiarity in 

 that the breast-bone long remains made up of 

 ossifications arranged in pairs, side by side, 

 successively (Fig. 49). 



The normal number of ribs in the Gorilla 

 and Chimpanzee is thirteen pairs,* in the 

 Orang and some Gibbons it is twelve, as in 

 man. 



In the Orang and Gibbons there are, as in 

 man, five lumbar vertebrae ; in the Gorilla 



