OCEANITIDJ2 457 



6 4 . Bill shorter, its length from the tip 

 to the base measured straight, about 

 equal to its distance from the eye ; 



its colour black (Estrelata, p. 477. 



6 s . Sides of the palate with a series of 



lamellae more or less developed. 

 rt 3 . Birds of large size ; wing about 2OO ; 

 sixteen tail-feathers ; nasal tube long 



about half the length of the bill Ossifraga, p. 482. 



W. Birds of intermediate size ; wing about 

 lO'O ; fourteen tail-feathers ; nasal tube 

 shorter, about one third of the length 



of the bill Daption, p. 485. 



c 3 . Birds of small size ; wing about 8'0 ; 

 twelve tail-feathers ; nasal tube very 

 short about one -fourth of the length 



of the bill Pram, p. 487. 



13. Nostrils opening upwards, side by side on the 



top of the bill ; no hind toe Pelicanoides, p. 493. 



C. Nostrils each enclosed in a separate long sheath 

 and opening on either side of the bill between 

 the culminicorn and the latericorn. 



a. Tail short and rounded ; no trace of a hind toe ; 



lower mandible without longitudinal sulcus. 



a 1 . Base of the culminicorn wide, meeting the 



latericorn behind the nostrils Diomedea, p. 494. 



6 1 . Base of the culminicorn narrowed pos- 

 teriorly, separated from the latericorn 

 behind the nostrils by membrane Thalassogeron,p. 501. 



b. Tail long and wedge-shaped ; hind toe repre- 



sented by a rudimentary claw ; a longitudinal 



groove along the lower mandible Phabetria, p. 505. 



Family I. OCEANLTID^E. 



Secondaries never more than ten in number ; leg bones longer 

 than the wing-bones ; tarsi very long covered in front by a single 

 shield or by transverse scutes ; claws more or less flattened ; no 

 caeca ; no basipterygoid processes ; semitendinosus with an acces- 

 sory head ; ambiens, when present, not passing over the knee. 



