182 CARI.VAT-j;. 



which it differs from the latter and resembles the Larldtp. 

 The imperfection of the middle of the fronto-pariotal 

 region renders it difficult to be sure as to the presence of 

 supraorbital grooves, but the appearance suggests their 

 presence. No history. 



A. 10. The distal extremity of a left humerus in a somewhat 

 (Fig.) waterworn condition provisionally referred to this species ; 

 from the London Clay of Sheppey. This specimen 

 (fig. 40, A) is probably the one referred to on p. 328 of 

 Owen's ' Palseontology,' 2nd ed., as indicating the presence 

 of a member of the Larida' in the London Clay. The 

 general characters, especially the deep supracondylar fossa 

 on the palmar aspect for the origin of the flexor brevis 

 antibrachii, are essentially those of the Laridte; and a 

 projection on the preaxial border above the radial condyle 

 seems to indicate the presence of an ectepicondylar pro- 

 cess. The specimen agrees exactly in relative size with 

 the cranium, and if rightly referred indicates that the 

 genus is closely allied to the Laridir. 



Shriibsole Collection. Purchased, 1880. 



Incert^ Sedis. 



Family ^GIALORNITHID^. 



The single representative of this family appears to be allied to 

 the Laridcp, but distinguished by the much shorter wings, the 

 absence of a V-shaped channel for the deltoid on the palmar aspect 

 of the humerus, and the shallower distal palmar depression of the 

 latter. 



If included in the Gaviae some of the characters here given as of 

 subordinal value will apply only to the family Laridce. The posi- 

 tion and large size of the ectepicondylar process of the humerus at 

 once distinguish this form from the Picarise \ 



^ In pi. clxv. fig. 2 of Milne-Edwards's ' Oiseaux Fossiles de la France,' the 

 proximal phalangeal of the manus of Mcrops is represented to be fenestrated in 

 the manner of that of the Larida and tlie present family ; such fenestration 

 does not, however, occur in a skeleton of Mcrops in the Museum of the Royal 

 College of Surgeons. 



