SYSTEMATIC ARRANGEMENT OF THE GENERA OF BIRDS xxv 
FAMILY PODICIPEDIDZ 
(GREBES) 
Hallux raised above level of other toes ; toes with wide lateral lobes, united 
at base. Tail vestigial. 
138. Poptcipes (Grebe). Bill forming pointed cylindrica] cone; second- 
aries, if any, very little shorter than primaries. Page 300 
ORDER TUBINARES 
External nostrils are produced into tubes; anterior toes fully webbed ; 
hallux small or absent. 
FAMILY PROCELLARIID/ 
Nostrils united exteriorly above culmen. 
139. FuLMARuS (Fulmar). Bill not solong as head; upper mandible of 
four portions divided by indentations, the whole large, strong, 
curving suddenly to point; under mandible grooved along sides, 
bent at end ; edges of mandibles sharp; nostrils prominent, united, 
enclosed, somewhat hidden in tube with single external orifice ; wings 
rather long, first quill longest; tarsi compressed, feet moderate. 
Page 304 
PuFrFinus (Shearwaters). Bill rather longer than head, slender; man- 
140. 
dibles compressed, decurved; nasal tube low, both nostrils visible 
from above, directed forwards and slightly upwards; wings long, 
pointed, first quill slightly the longest; tail graduated; tarsi 
compressed laterally. Page 305 
141. PRoOcELLARIA (Storm and Fork-tailed Petrels). Bill small, robust, 
much shorter than head, straight to nail, which is decurved; wings 
long, narrow, second quill longest, slightly exceeding third, first 
shorter than fourth; tail moderate, slightly rounded; legs moderate, 
claws rather short. Page 307 
