380 



STERNA OF THE PENGUINS. 



incapable of every thing ^vhich can with propriety be 

 called flight, though they assist some of the species 

 in a peculiar kind of leaping motion by which they 

 can clear any obstacle with which they meet, by 

 leaping three or four feet clear of the water. English 

 sailors call those which have this habit by the not 

 very inappropriate name of " Jumping Jacks." 



These have the sternum elongated, with the keel 

 well developed, pointed at its angle, and extending 

 considerably in advance of the sternum. The ante- 

 rior edge of the sternum ^-ith two large furrows, ter- 

 minating in a depression in some of the species, and 

 in a perforation in others. The sides of the sternum 

 concave in the anterior part, and convex in the 



Cape Penguin. 



posterior. The concave portion having six ribs 

 attached, the last one double ; and the convex con- 

 sisting of a slender process, extending backward to a 



