1838.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 265 



Above, it is very concave, accompanied of course by a corresponding 

 convexity of the pectoral aspect. It is upon this latter tbat we notice 

 that the muscular line meets the base of the keel at junction of middle 

 and anterior third, differing considerably from Oceanodroma in this re- 

 spect. 



The carina is deep in front and gradually slopes away to the posterior 

 margiu. Its anterior border is broad and straight, being deeply grooved 

 from above downward. The angle stands out quite prominently and 



F 



Fig. 7. Inferior view of the sternum of Fulmarus glacialis rodgersii. Life size. 

 Fig. 8. The same bone; right lateral view. 



Fig. 9. Direct anterior aspect of right coracoid and scapula. Same specimen. All life size. Drawn 

 by the author from specimen 12013 of the Smithsonian collection. 



may have its end truncate and thickened. Each costal border is very 

 wide from side to side, and supports the sis prominent, regularly ar- 

 ranged facets for the costal ribs. 



There are no pneumatic foramina to be seen among them. Indeed, 

 this is one of the differences between this bone and the sternum of an 

 Albatross, which is thoroughly permeated by air cavities. The anterior 

 border, between the rather lofty costal processes, is bent forward at an 

 angle, the apex of which supports below the trihedral manubrium. 



