400 Annals of the Carnegie Museum. 



Plate XXII. 



Fig. 26. Ventral aspect of the sternum of a specimen of a " Cahow "; adult; 

 nat. size. McGall colleition. 



Fig. 2"]. Ventral aspect of the sternum of another specimen of the " Ca- 

 how " ; adult ; nat. size. Collection of Mr. Edward McGall. 



Fig. 28. Ventral aspect of the sternum of a specimen of the skeleton in 

 the U. S. Nat. Mus., Division of Birds, labeled : " Puffinus obscurus " (No. 

 17724). Same individual as the one in which the skull is figured on Plate 

 I., Fig. 6. There is a pathological condition present on the left side of the 

 body of this sternum, next to the keel. It was healed at the time the bird 

 was taken, and was either due to disease or a punctured wound. Nat. size. 



Fig. 29. Direct ventral view of a sternum of Puffinus mcgalli in the McGall 

 collection (Subfossil, Bermuda). Nat. size, and from an adult bird. (See 

 description in the text.) 



Fig. 30. Direct ventral view of the sternum of Daption capense. No. 

 18210, Coll. U. S. Nat. Mus.; nat. size. 



Fig. 31. Ventral view of the sternum of a specimen of Puffinus gavia (No. 

 18286, Coll. U. S. Nat. Mus. "Puffinus gavius," Barrier Island, F. F. Cheese- 

 man, Auckland Museum). 



Fig. 32. Right lateral view of the sternum of a specimen of the "Cahow"; 

 nat. size. McGall collection. 



Fig. 33. Ventral view of the sternum of a specimen of "Puffinus obscurus" ; 

 collection of C. J. Maynard. Bones of pectoral arch articulated in situ; 

 adult; nat. size. Some of the costal ribs still attached. See description in 

 text. 



