m 



rm AIBAT«t5SS, 



edge of the bone, which mciii !>raiioi us portion 

 usually found wanting in the prepared ^ulls ql 

 those Ibirdfi. lo th^ L«r«» &f gttH trilJ^ tlte fat- 

 ness of thecavitiesj am! thoir extending over tlic 

 anterior part of the skidl, so as nearly, if" not 

 actually, to touch, seems a distini^riisliing mark 

 in that genus, lu the booby, duck, uiid some 



^sts, h&tig situated over tfaj^ Orbit, merely on a 

 membranous prfjjection. 



My brotlier, Mr. F. D. Bennett, exhibited, at 

 the meeting of tlic Zoological Society, on the 

 25tll of Jtmi tS^% a drfed prci)araij6ii of the 



(I)iomedea exulaits, Linn.) for the purpose of de- 

 monstrating the existence in that bird of an opi- 

 ;glottis ; and observed, that the rtma glottklls is 



botoctdi % tw dfev^tei ftssliy lips, wtn^h em*- 

 sist of mii<$<»i^» membrane atud dome few muscutar 



filn-es, and fPfei armed witli retroflexed spieidie. 

 These lips are in perfect contact at the liiuth'r 

 part of the glottis when it is closed, hut diverge 

 mast UlCil^OT part» somtiis teama ttiangu- 

 ojp^ spdOie 0f «boiit %h& size of a the 



edges of which are incapalde of being approx- 

 iuuited to each otlier. In front of tliis trianguhir 

 aperture, aiul at some distance behind tfie tongue, 

 (^to whicli it iif connected by iiiuccfus nicndjruwe 



