492 A COXTRIBUTION TOWARDS THE PTERYLOGRAPHY OF THE MEGAPODII. 



Fig. 4. Dorsal aspect of right wing of embryo (Fig. 1) showing the first appearance 



of the feather-papillaj representing the remiges and major coverts of the fore-arm. The 

 arrangement is seen to be diastataxial. 



c. c. Carpal covert. 



c. r. Carpal remex. 



i. c. Intercalary coverts. 



med. c. 3Iedian coverts. 



mj. c. Major coverts. 



min. c. Minor coverts. 



Ith c. r. 7th cubital remex. 



Fig. 5. A pre-penna of a nestling Turkey. To show the after-shaft, and widely sepa- 

 rated radii. Note the filamentous ends of the rami. 



A. After-shaft. 



D. f. Definitive feather. 



Rd. Radius. 



Jivi. Ramus. 



Fig. 6. A feather from a nestling Megapode. This should be contrasted with Fig. .5. 



Fig. 7. Portion of a definitive feather supporting a rudimentary pre-penna from a late 

 embryonic stage of Megapodius eremiia. 



D. f. Definitive feather. 



P. Pith cells. 



P.p. Pre-penna. 



R. Rami. 



Fig. S. Portion of a definitive feather with rudimentary pre-penna from a ripe embryo 

 of same species as Fig. 7. 



Fig. 9. Portion of a definitive feather of a nestling Turkey, supporting a pre-penna, 

 the distal portion of which has been removed. The rami of the pre-penna have burst the 

 investing sheath and are now free. 



Fig. 10. Portion of a radius from the base of a feather from a nestling Megapode. 



Fig. 11. Portion of a radius from the pre-penna of a nestling Turkey, i^. = Fila. 



