PLATE IV 



Pygoscelis papua. 



Fig. I. Embryo, stage 37 (No. 7). n, nictitating membrane; rm, feather 

 papillae of wing. 



Fig. 2. Dissection right side (right lobe of liver and part of intestine 

 removed), al, allantois; ala, right allantoic artery; ca, carotid artery; 

 cd, coracoid ; d, clavicle ; da, coeliac artery ; cr, crop region ; go, gonad ; 

 gp, genital papilla; hm, hemispheres; i, intestine; j, jugular vein; 

 k, opisthonephros ; /, liver; lu, lung; nt, neural tube; 0, optic lobe; 

 p, pericardiac wall; pa, pulmonary artery; pn, pancreas; r, rectum; 

 s, systemic aorta; sa, subclavian artery; se, sternum; st, stomach; 

 tl, thalamencephalon ; th, thymus gland; tr, trachea; vc, vena cava; 

 vn, vagus nerve ;3', yolk duct. 



