The letters M.C.D. or C^ placed above each diagram, signify Metacarjio-digUah or CulitnU. 



The Roman cyphers, from I. to X., above the symbols Q O &c- of figure ] , denote the numerical order of 

 the remiges and the major coverts, with Avhich they are allied, and apply also- to the other diagrams beneath. 



The darts placed over or below any sub-series of major coverts point in the direction of tiieir respective 

 nequence of moult. 



The spherical symbol's (and further explained on table itself) represent a theoretical cross-section through 

 the projected quills and coverts for which the}' stand, made longitudinally the whole length of the posterior 

 margin of the extended wing,, or portion of it, as in the case o-f figs. 5 & &. 



Fig. 1. Showing Group-moulting for the upper majjor coverts VIII. -X. on the cubitus, and the simultaneous 

 appearance for I.-VII. in relation to their remiges under moult (Degree 1). Also showing the 

 relative movement of the remiges and the major coverts for the haud-portion. 



rig. 2. Shows upper cubital major coverts I.— lY. inclusive of carpal covert, forming Group II. by moulting in 

 an inward direction, or one opposed to the stage for the same sub-series, illustrated in specimen 

 represented by fig. 1. It further shows the first stage of moult in relationship to the remiges of the 

 inferior major coverts for the hand-portion (2nd degree). 



Fig. 3. Shows the 3rd degree, or that of cubital major coverts V.-VII., constituting Group III., its integers 

 as yet appearing simultaneously. It also shows the more advanced condition of moult for the 

 progressive movement of the ventral major coverts on the hand-portion of the wing. 



Fig. 4. Shows the final stage of moult in their relationship to each other of the remiges and the major coverts, 

 both upper and lower, in synchronous Group-arrangement for the cubitus, and in regular sequence 

 outwards for the metacarpo-digital portion, a mode which is adopted only by the fully adult 

 bird. 



Fig. 5. Shows the initial stage in the replacement of the inferior major coverts for the hand-portion. 



Fig. 6. Represents a similar stage, though slightly in advance of that seen in fig. -5. 



