CUOSS()l'TKRY(;iI. 



73 



FIG. 56. 



Rhizodus hibberti ; left mandibular ramus from the outer aspect (A), right 

 clavicle from inner aspect (B), and right infraclavicle from inner aspect (c), 

 all about one-quarter nat. size. L. Carboniferous; Midlothian. ag., 

 angular; d, dentary ; i.d., infradentaries. (From Brit. Iftw. Catal.) 



