410 ME. W. p. PVCKAFT OK THB [Mar. 21, 



xii. List op Woeks eefeeeed to oe consctltbd. 



1. Beddaed, F. E. — Structure and Classification of Birds. 1898. 



2. Beddaed, F. E. — "Note upon lutercentra in the Vertebral 



Column of Birds." P. Z. S. 1897. 



3. Brandt, J. E. — " Beitriige zur Kennt. der Naturgesch. der 

 Vogel." Mem. Acad. Imp. des Sciences St. Petersbourg, 

 ser. vi. vol. iii. 1839-40. 



4. Eyton, B. C— Osteologia Avium. London, 1867, pp. 222-4, 



pi. 37. 



5. Eoebes, W. a. — " Beport on the Anatomy of the Tubinares." 



'Challenger' Keports, vol. iv. pt. xi. pp. 1-64, pis. i-viii., 1882. 



6. Eoebes, W. A. — " On the Petrel called Thalassidroma nereis . . . 



and its Affinities." P. Z. S. 1881, pp. 735-737. 



7. EiJEBEiNGEE, M.^ — Untersuch. zur Morphol. und Systemat. der 



Vogel. II. AUegem. Theil, S. 1588. 1888. 



8. Gadow, H.— Broiin's Thier-Eeich, Bd. vi. A^ogel, 1891, 

 Anatom. Theil. 



9. Gadow, H.— Ibid., Syst. Theil. 1893. 



10. Gaerod, a. H. — " On certain Muscles of the Thigh in Birds." 



P. Z. S. 1873, pp. 626-644; 1874, pp. 111-123, pi. xvii. 



11. Gaeeod, a. H. — " JN^otes on the Anatomy of Felecanoides 



urinatrix" Coll. Sci. Papers, 1881, p. 521. 



12. HuxLET, T. H.— " On the Classification of Birds." P. Z. S. 



1867, p. 455. 



13. Lydekkee, E.— Cat. Eoss. Birds Brit. Mus., 1891. 



14. Milne-Edwaeds, A. — Eecherches pour servir a I'Histoire des 



Oiseaux Fossiles de la France, vol. i. p. 301 et seq., 1867-68. 



15. Pyceaft, W. p. — " Contributions to the Osteology of Birds 



(Stegauopodes)." P. Z. S. 1898, pp. 82-101, pis. vii. & viii. 



16. Pyceaft, W. P. — "Contributions to the Osteology of Birds 



(Impennes)." P. Z. S. 1898, pp. 958-89. 



17. Eeinhaedt, J. — " Ora en hidtil ubekjeudt Knogle i Hoved- 



skallen hos Turakverne (MusopJuigides)." Vidensk. Medd. 

 Naturh. For. Kjobeuhavn, 1870, pp\ 326-341. 



18. Saltin, O.— Cat. Birds Brit. Mus., vol. xxv., ] 896. 



19. Seebohm, H. — Classification of Birds. 1895. 



20. Shaepe, E. B. — EevievF of Eecent Attempts to Classify 



Birds. 1891. 



EXPLANATION OF THE PLATES. 



Plate XXn 



c.^5.= cerebellar promiuence. 6.c.s=sagittal crest. 



c.r. = coroi;al ridge. «j.p.w.=squairioso-parietaI wing. 



/.=; lachrymal. s.o.^.= supraorbital ridge. 



w.=nasai. s.oJ.= ,, ledge. 



7i.pmx.—ua.sal process of premasdlla. )!./.= temporal fossa. 



g.= quadrate. 



The Dorsal Aspect of the Skull. 

 Fig. 1. Tbe skull of Puffinm Jcuhli, nat. size, to show the large temporal 



