FEATHERS OF PENGUINS. 



much shorter than the rhachis of the definitive feather. This arrangement is somewhat 

 remarkable and demands further explanation. 



FIG. 3. A DEVELOPING CONTOUR FEATHER OP PygOSCtlis odelid, SHOWING THE MESOPTYLE DOWN-PLUMAGE BOBNE IN 

 PART BY THE MAIN SHAFT, AND IN PART BY THE AFTER-SHAFT (a). 



In the first place, the fact that any of the rami of the pre-penna should be found in 

 organic connection with those of the after-shaft of the contour feather is, so far as I 

 know at present, elsewhere unknown. There can be no doubt, I think, but that the 



