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MANUAL OF ELEMENTARY ZOOLOGY 



as their sternal portions or as sternal ribs. The end which 

 articulates with the vertebra has a knob known as the head or 

 capitulum. The first nine pairs have a second facet on the 

 dorsal side at a short distance beyond the head. This is 



Fig. 311. — The breastbone and shoulder girdle of a rabbit, seen from 

 below and somewhat from in front. 



acr.. Acromion ; cl., clavicle ; cor. t coracoid process ; eft., capitulum ; g.c, glenoid 

 cavity; mb., manubrium; mcr., metacromion ; $c, scapula; st.r., "sternal 

 portion of a rib ; j/.z, st.6, second and sixth stemebree : tb., tuberculum ; zi.r., 

 vertebral portion of a rib ; x. t xiphisternum ; .r.c, xiphoid cartilage. 



for articulation with the transverse process of the vertebra, 

 and immediately beyond it, for the attachment of liga- 

 ments, is a short projection, together with which it forms the 

 tuberculum. The sternal portions of the first seven pairs arti- 

 culate directly with the sternum ; those of the eighth and 



