Fig. 1. Skull of CEstrclata lessoni, viewed from the side. All the figures are of the 

 natural size. 



Fig. 2. The same, from below. 



Fig. 3. The same, from above. 



Fig. 4. Skull of Prion vittatus, from below. 



Fig. 5. Vomer, — with the ascending plate, anchylosed to it, of the palatine bones, 

 — of Diomedea exulans, from the side. 



Fig. 6. The same, from above. 



Fig. 7. Left uncinate bone (" os crochu " of Reinhardt) from behind, of Thalassiarche 

 culminata. 



Fig. 8. The same of Phcebetria fuliginosa. 



Fig. 9. Left humerus of Majaqueus cequinoctialis, from above. 



Fig. 10. Proximal, and fig. 11, distal extremities of the same bone, inferior surface. 



Fig. 12. Pelvis, seen from the side, of Majaqueus cequinoctialis. 



Fig. 13. Proximal end of right tibia of Ossifraga gigantea, to show the cnemial crest. 



Fig. 14. Hallux of Ossifraga, with its metatarsal. The single phalanx of which it 

 consists is vertically bisected, to show the hollow interior. 



