LARID.B. 177 



a V-shaped channel running parallel to the delto-peetoral crest, for 

 the insertion of the deltoid ; the section of the proximal portion of 

 the shaft is triangular — a ridge on the dorsal aspect running down- 

 wards from the head ; there is a large ectepicondylar process, and a 

 very deep supracondylar fossa on the palmar aspect. 



The ulna is slightly shorter than the humerus, and is relatively 

 stouter and more curved than in the next suhorder. 



The proximal phalangeal of the index digit of the manus is per- 

 forated bv two fenestra?. 



Family LARIDtE. 

 Includes all the existing members of the suborder. 



Genus LARUS, Linn.' 



The type genus. To include the undermentioned fossil forms 

 this generic term must be used in a considerably wider sense than 



Fig. 39. 



Larus elegans. — Palmar aspect of the right humerus ; from the Lower Miocene 

 ofAllier. \. a, radial condyle; 6, ulnar do.; r, supracondylar depres- 

 sion ; d, ectepicondylar process. 



in recent ornithology. The tarso- metatarsus is elongated and has 

 no channel on the anterior face. 



Larus elegans, Milne-Edwards -. 



A small species, rather more than half the size of the existing L. 

 ridibundus, and distinguished from all living forms by the relatively 

 longer and more slender legs. Length of humerus 0,050 ; tricipital 



' Syst. Nat. ed. 12, vol. i. p. 221 (1766). 



' Oiaeaux Fossiles de la France, vol. i. p. 360 (1867-6S). 



