OPISTHOCOM1 



variation as to the number of cervical vertebrae, which bear 

 long rib stylets. As a rule five complete ribs exist, of which 

 all bear uncinate processes. The sternum (see fig. 140) is ex- 

 ceedingly remarkable in its form. It is wider behind than in 

 Front, with a pair of notches, and outside of these a pair of 

 foramina ; the keel is shorn away anteriorly, but well deve- 

 loped posteriorly. The furcula, which is shaped like a fork 

 with nearly straight lines, is completely ankylosed on the 

 one hand with the coracoids, and by its median region with 



. 140. STERNUM OF Opisthocomus. 



SIDE VIEW. (AFTER HUXLEY.) 



141. STERNUM OF 

 tliocomus. FRONT VIEW. 

 (AFTER HUXLEY.) 



the spina externa sterni. The region of the furcula, however, 

 which comes into contact with the sternum was found by 

 PAEKER to be a separate ' needle of bone,' which he regarded 

 as the iuterclavicle (see p. lol). The scapula is provided in 

 the young with a distinct suprascapula, segmented off from 

 the scapula. 



The pelvis is especially compared by HUXLEY with that 

 of Gotuni-i.r ; it has no ileo-pectineal processes. 



