Petrels from the North- East Pacific Ocean. 



-)93 



later be utilised as typical of the genus. In tlic present 

 case, the peeuliar tarsal structure suggests coincident 

 anatomical variation. Another peculiarity of the tarsus is 



Text-figure 9. 



A. Top view of bill of Puffinus bminermani. 



C. Side view of ditto. 



B. Top view of bill of Calonectris leucomelas. 



D. Side view of ditto. 



that it is shorter than the chord of the culmen, a feature 

 not shared by any other Puffin-like birds, save P. kiihli. 

 The more we study that species the more resemblances we 



