PLATE III 



Pygoscelis papua. 



Fig. I. Embrj'o, stage 31 (No. 5). b, beak ; /, limb buds; op, operculum. 



Fig. 2. Embryo, stage 34 (No. 6). n, nictitating membrane; rt, feather 

 papillae; sc, papillae sclerae; t, tongue. 



