Ixviii 
Vol. X.] 
whicli tlie total absence of pigment extended also to the iris, 
which thus hccaine pink, and often to the beak and feet as 
well, and ‘^pied^^ or partially wliite-pluniaged birds, which 
had in many cases been at first clothed with a perfectly 
normal plumage, and in which the partial absence of pigment 
sometimes appeared after several moults, and was not always 
quite constant. Such pied aberrations frequently occurred 
among cage-birds. It was not quite correct to call such 
pied birds albinos, as was often done by collectors — partial 
albinos or ^Meucocisms” would be better determination for 
such individuals, unless the term “ pied ” could be restricted 
to such “ freaks.’^ 
Mounted Specimens. 
Apteryx oweni. S. 1., New Zealand. Nearly all white. 
Apteryx australis. S. I., New Zealand. Head and neck 
white. 
English Pheasants. One silvery-grey, one steel-blue, one 
whitish variety. 
Gennveus ALBOCRISTATUS. S- Nepal. Brownish white. 
Tetrao urogallus. S ‘"id. Russia. Body and wings w hite, 
with black spots. 
? ad. Akmolinsk. White, with black bars to the 
feathers ; chest uniform white. 
Tetrao tetrix. (T ad. Orenburg. Remiges and rectrices 
mostly pure white. 
S ad. Olanitz. Almost the entire underside vvliite. 
ad. Russia. (Leadenhall iMarket.) Pied ; the 
wings with a great deal of white. 
J ad. Perm. Silvery grey. 
$ ad. Twer, Russia. Greyish white. 
? ad. Russia. Pure wdiite. 
? ad. Russia. Grey, buff, and black in curious 
mixture. 
Lagopus scoTieus. ($ . Scotland. Buff and wdiitc variety. 
