•' AQUINTOCUBITALISM IN THE BIRD S WIKG. 255 



bibliography. 



(1) Degek, E. " On some of the Main Features in the Evolution 



of the Bird's Wing." Bull. Brit. Ornith. Club, vol. ii., 

 1894. 



(2) GrADOw, H. Bronn's Klassen und Ordnung. des Thier- 



Eeichs. Vogel. Anatomische Tlieil, 1891. 



(3) Geebe, Z. " Sur les Plumes du Vol et leur Mue." Bull. 



See. Zool. Erance, torn, ii., 1877. 



(4) GoODCHJLD, J. G. " The Cubital Coverts of the Euornithes 



in relation to Taxonomy." Proc. Roy. Phys. Soc. Edinb. 

 vol. X., 1890-91, pp. 317-333. 



(5) PrCRATT, W. P. "A ContributioD to the Pterylography of 



Birds' "Wiugs." Trans. Leicester Lit. and Phil. Soc., 

 vol. ii. p. 123, 1890. 



(6) Seebohm, H. Classification of Birds. 1895. 



(7) Sukdevall, C. J. On the "VViags of Birds. (Translated 



from the Swedish.) Ibis, 1886, pp. 389-457. 



(8) What, E. S. " On some Points in tlie Morphology of the 



Wing of Birds." Proc. Zool. Soc. 1887, p. 343. 



EPPLANATION OF THE PLATES. 



Reference letters. 

 ex. = carpal covert. 

 c.r. = carpal remex. 



i.e. = intercalary coverts, intercalary row. 

 med.e. = median covert. 

 mj.c. = major covert. 

 v.mj.e. = ventral major covert. 

 min.c. = minor covert. 

 mi.c. = „ „ 



Plate 14. 

 Fig. 1. Eight wing, dorsal aspect, of an embryo Vanellus cristatus, showing the 



first appearance of the feather-papilla representing the remiges and 



major coverts of the forearm, — and indistinctly of the primaries. 

 Fig. 2. The same in a more advanced stage of development. Several rows of 



coverts have now appeared, and "faulting" has ali-eady taken place. 



The wing is now diastataxic ; in fig. 1 it is still eutaxic. 

 Fig. 3. Portion of the right wing, dorso-ventral aspect, of an embryo Maehetes 



pugnax, showing position of ventral major coverts. 

 Fig. 4. Eight wing, dorsal asjject, of an embryo Gallus bankiva, var. domestica. 



This is an eutaxic wing. The coverts have been marked as in the 



diastataxic forms for the purpose of comparison. 



