332 Proceedings of the Royal Physical Society. 



(3) Some of the outer feathers of each 

 row show distal overlap. The 

 Peristeropod Gallinpe (Fig. 9), 

 Curassows, Brush Turkeys, Mega- 

 pods, etc. 

 II. Coverts interrupted, or faulted, in consequence of 

 the absence of the fifth cubital remex. 



{a) Corresponding to the CUCULI; with two, 

 or, at the most, three rows of Minor 

 Coverts, with the Coverts lengthened by 

 faulting, and the outer feathers reversed 

 so as to overlap distally. 



(a) Predominant proximal overlap of 



the Medians — Gourid^ (Fig. 

 16). 



(b) Distal overlap of the interior third 



of the Medians and Minors — 

 most of the Goatsuckers (Fig. 



11). 



(h) Generally with more than three rows of 

 Minor Coverts, which, with the Medians, 

 show predominant proximal overlap over 

 all but the inner third of each row. 

 Usually with five Medians lengthened by 

 the faulting consequent upon the absence 

 of the fifth cubital remex. PSITTACI 

 (Fig. 12), STRIGES, ACCIPITPES 

 (Fig. 13), HEPODIONES (Fig. 15), 

 ANSERES(Fig. 14), and the Cormorants, 

 (c) Distal overlap predominating, outer third 

 of the Medians always showing distal 

 overlap, and lengthened by the faulting. 

 All the typical GRALL^ (Figs. 18 and 

 18a), also Steatornis, and Pandion (Fig. 

 19). 

 C. Medians entirely with proximal overlap. 



{a) No clear division between the Minors and the Mar- 

 ginals. Outer Medians shortened. Normal 

 COLUMBI (Fig. 17). 

 {b) Minors and Marginals distinctly separated. Outer 

 Medians lengthened. Gruid^, Larid^ (Fig- 20), 



