AZ A. Mr. W. P. Pycraft on the 
vane—is Podicipes rollandi (text-fig. 30, p. 475). Herein 
the feathers, though greatly reduced in length, have a 
perfectly normal vane, thus shewing that the barbules of the 
Text-fig, 29. 
Tail-feather of Podicipes griseigena, shewing the degenerate 
- character of the vane. X 3. 
feather have preserved their integrity. But from the dried 
skins which I have examined I have found it impossible to 
make out, satisfactorily, whether their arrangement with 
regard to the pygostyle is normal, 
