THE BIBS, THE STERNUM, AND THE THOKAX 



139 



The head is larger. The tubercle is lower, but larger, and its 

 articular surface is convex from the cephalic to the caudal edge and 

 concave transversely. The angle is distinct and more ventral than in 

 the preceding rib. 



Spinous Process, ~] 

 Transverse Process, 



Neural Canal, 



Tubercle. 



Cephalic Articular 

 Sit rface. 



- 2 

 I o 



i s'i 



H H 



H 



W 



Angle. 



Head, } 



Tubercle, 



Costal 

 Cartilage, . 



O 



% 



yi 

 H 







Sternebra. 



Second Sternebra. 



J-'irxt Sti'i'inlii'ii Hi- Mmiiilii-iiiiii. 



CEPHALIC END OF THORAX. THREE THORACIC VERTEBRA, THREE PAIRS OF RIBS, AND 



THREE STERNEBR.E. 



The Fifth and Sixth Ribs (Fig. 98) differ from the fourth and from 

 each other merely in size. The fifth is a fifth longer than the fourth, 

 no stouter, and the sternal end has a more decided curve toward the 

 tail. The sixth is about a seventh longer than the fifth, but rounded 

 and more slender. 



