410 ME. w. ip. pi-CRAPT ON THE [Mar. 21, 



xii. List of Woeks eefeeeed to oe consulted. 



1. Bbddaed, r. E. — Structure and Classification of Birds. 1898. 



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



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



3. Beandt, J. E. — " Beitrage zur Kennt. der Naturgescli. der 

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

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



4. Etton, E. C— Osteologia Avium. Londoo, 1867, pp. 222-4, 



pi. 37. 



5. EoEBES, W. A. — " Eeport on the Anatomy of the Tubinares." 



' Challenger' Reports, 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. EtJEBEiNGEE, M. — TJntersuch. zur Morphol. und Systemat. der 



Yogel. II. Allegem. Theil, S. 1588. 1888. 



8. G-ADOW, H.— Bronn's Thier-Eeich, Bd. vi. Vogel, 1891, 

 Anatom. Theil. 



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



10. GrAEEOD, A. H. — " On certain Muscles of the Thigh in Birds." 

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



11. Gaeeod, a. H. — " Notes on the Anatomy of Felecanoides 



urinatrixJ' Coll. Sci. Papers, 1881, p. 521. 



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



1867, p. 455. 



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



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



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

 16. Pyceaet, W. p. — " Contributions to the Osteology of Birds 

 (Steganopodes)." P. Z. 8. 1898, pp. 82-101, pis. vii. & viii. 



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



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



17. Eeikhaedt, J. — " Orn en hidtil ubekjendt Knogle i Hoved- 



skallen hos Turakverne (MusopJiaqides).^' Vidensk. Medd. 

 Naturh. Eor. Kjobenhavn, 1870, pp. 326-341. 



18. Salvin, O.— Cat. Birds Brit. Mus., vol. xxv., 1896. 



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



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

 Birds. 1891. 



EXPLANATION OF THE PLATES. 



Plate XXII 



(;.^.= cerebellar prominence. s.c.= sagittal crest. 



c.r. = coronai ridge. S2'.;p.w.=squamoso-parietal wing. 



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



!». = nasal. s.o.L— ,, ledge. 



n.p?nx.=na,sal process of premasilla. i?./.=teniporal fossa. 



2. = quadrate. 



The Dorsal Aspect of the Skull. 

 Fig. I. The skull of Puffinus Jcuhli, nat. size, to show the large temporal 



