Observations on the Cubital Coverts of the Euornithes. 181 
commences a series in which the whole of the Medians show 
distal overlap. Near to the Plovers come the Gulls and 
Terns (fig. 20), together with the non-diving Petrels. 
Another line of modification of the Pluvialine pattern leads 
to the Phcenicopteride, Plataleidz, Ciconiide, Serpentarius, 
Tantalus, and some few other birds. 
Linked on to the last by the Skuas and the Fulmars, and 
at the end of the whole series, comes a certain number of 
birds whose wings show distal overlap over nearly their 
whole surface. These include the Cathartz (fig. 22, loc. cit.), 
Leptoptilus (fig. 21, loc. cit.), Fregata, Sula (fig. 23, loc. cit), 
Diomedea, Plotus (fig. 24, loc. cit.), Puffinus, and the Tubinares 
in general. 
In conclusion, I have to thank the following gentlemen for 
help rendered by the gift of specimens—Captain Davies, 
Skomer Island; Rev. H. A. Macpherson; Prof. D’Arcy 
Thompson; Messrs Robert Howard; J. C. Smith, Penrith; 
F. E. Beddard; Wm. Evans, Sec. Royal Physical Society ; 
W. Eagle Clarke, Donald Knight, Frank Traill, and others. 
