xiv.] MONOTREMATA. 265 



extremity, as well as the coracoids and epicoracoids, in being 

 developed in membrane. 



The clavicles (d) are simple, elongated, slightly curved, 

 thin, splint-like bones, resting upon the anterior surface of 

 the arms of the interclavicle, pointed and not quite meeting 

 internally, and dilated and articulating directly with the 

 acromion at their outer end. 



