u 



bony hpm|>o|)hjfr* ; the Ut two pain of rib* we attached to the Mcrum. There we 9 

 caudal mttbfiB. The pectoral process of the humenu U strongly developed and incurred, 

 and there u a stroag ectocondy loid process, 



Mtu. So*tk. 



ISM. The skeleton of the Cob, or Black-backed Gull (Lanu marimu). 



It preteoti large but shallow suprrorhiul glandular foatas. The angle of the jaw is much 

 developed, and curved inward* and upwards : an oval perforation is left between the anrhy - 

 losed angular and surangular pieces, and an oolong fissure between these and the dentary 

 piece of the lower jaw. The number of Tertebne from the skull to the sacrum are 20, of 

 which the last six support ribs which are articulated by their hsemapophyses to the sternum. 

 The but rib is attached to the sacrum, and U joined to the preceding rib by its hsemapophy- 

 M : the first rib is free and unattached to the sternum. There are 9 caudal vertebrae. 



M**. Soutk. 



1227. The skull of the Cob, or Black-backed Gull (Lariu marimu, Linn.). 



Prntmted by W. Bullock, Eq. 



1228. The skull of the Black-backed Gull (Lariu marimu'). Hu*teria. 



The skull of the Black-backed Gull (Lanu mariiuu), in longitudinal section. 



llunteria*. 



1230. The skull of a Gull, rather smaller than the preceding specimens from the 

 Lanu mariiuu. llunicriax. 



1231. The skull of the Brown, or Skua Gull (Lar*s catarracM). Htmterian. 



1232. The skull of the common Gull (Lanu camu). Ilunteria*. 



1233. The skeleton of the Three-toed Gull (Lariu tridactyltu). 



It has 21 rertebne between the skull and sacrum, the last seren of which rapport ribs : of 

 these the first pair is free and floating ; the sis succeeding ones are articulated to the sternum 

 by bony hsemapophyses ; the last or eighth pair of ribs are attached to the sacrum, and their 

 hrmapophyses join those of UM preceding pair. There are 9 caudal vertebne. 



