INTRODUCTION. XXxiX 
wing. Legs and feet long, attached behind the centre of gravity ; tarsi very 
much compressed ; three toes in front, one behind ; anterior toes very much 
flattened, united at the base, surrounded by a lobated membrane; hind toe 
also flattened, articulated on the inner surface of the tarsus; claws large, 
flat (p. 717). 
Order TUBINARES. 
Family PROCELLARIID. 
Nostrils united externally above the culmen; margin of the sternum even ; 
manubrium of furcula long ; coracoids long, comparatively narrow across the base 
and slightly divergent ; second primary the longest (Salvin). 
PROCELLARIA, Léunc@its.—Bill small, robust, much shorter than the head, straight 
to the nail, which is decurved; nostrils dorsal. Wings long, narrow; the 
second quill-feather slightly exceeding the third; the first quill shorter 
than the fourth. Tail of moderate length, slightly rounded. Legs 
moderate, the tarsi anteriorly reticulate, and a little longer than the feet ; 
webs emarginated ; claws rather short (p. 727). 
OcEANODROMA, Rezchenbach.—Bill shorter than the head, moderately stout, 
compressed, rising slightly at the nail, then decurved; nostrils dorsal. 
Wings long and narrow; the first quill-feather shorter than the second 
and also than the third, and about equal to the fourth. Tail long and 
deeply forked Legs short, slender; tarsi anteriorly reticulated ; hind toe 
minute, front toes long and slender with webs slightly emarginated (p. 729). 
OcEANITES, Keyserling & Blasius.—Bill small and weak, the nail gradually 
decurved ; nasal tubes perfectly horizontal. Wings exceedingly long, the 
second quill much the longest, the first quill being shorter than the fourth, 
and slightly exceeding the fifth. Tail almost square. Legs long and slender, 
bare for a considerable distance above the tarsal joint ; feet nearly as long as 
the tarsi, membranes emarginated, hind toe absent ; claws sharp, spatulated, 
not much flattened (p. 733). 
PELAGODROMA, Retchenbach.—Much as in Oceanztes, but claws flattened and 
wide ; first primary decidedly shorter than the third (p. 735). 
Family PUFFINID. 
Nostrils united externally, or nearly so, above the culmen; margin of the 
sternum uneven ; distinct pterygoid processes ; manubrium of furcula very short ; 
coracoids short, wide at the base and divergent ; first primary the longest, or 
not shorter than the second (Salvin). 
Purrinus, Brisson.—-Bill rather longer than the head, slender ; mandibles com- 
pressed and decurved. Nostrils tubular, with two separate orifices. Wings 
long and pointed, the first quill slightly the longest. Tail graduated. Tarsi 
compressed laterally ; three toes in front, rather long, webbed throughout ; 
hind toe rudimentary (p. 737)- 
CEsTRELATA, Bonaparte.—Bill rather shorter than the head, stout, compressea, 
straight for some distance, then ascending at the commencement of the unguis, 
