184 CARINAT^. 



features already noticed, these bones resemble the humerus 

 of the Laridce in the prominence above the ulnar con- 

 dyle for muscular attachment, and the presence of two 

 pits for the same purpose on the inner side of the distal 

 extremity. The form of the dclto-pectoral crest, the 

 position and shape of the facet for the pectoralis minor, 

 the flatness of the head, and the prominence of the ulnar 

 tuberosity, are also essentially Larine features. 



A. 61. Three specimens of the right ulna. 



A. 63. Eleven specimens of the metacarpus. In the parallelism of 

 the two bars, and the prominence of the proximal spur, 

 these specimens agree with the Laridce. 



A. 64. Three specimens (one imperfect) of the proximal phalangeal 

 {Fig.) of the second (index) digit of the manus. These specimens 

 (fig. 41, B) agree in every detail with the corresponding 

 extremely characteristic bone of the Laridcr. 



A. 62. Two specimens of the right coracoid. Length 0,019. In 

 their slender shape, the inflection of the anterior angle of 

 the sternal border, and the contour of the whole sternal 

 surface, these bones resemble the coracoid of the Laridce ; 

 but they appear to have had no crotchet-like hyosternal 

 process. The perforation at the base of the subclavicular 

 process is small. 



Suborder XVI. TU BIN ARES. 



Long-winged Schizognathous birds with sharply hooked beaks, 

 the temporal fossae of the skull widely separated, the angle of the 

 mandible truncated, an ectepicondylar process to the humerus, no 

 fenestration of the proximal phalangeal of the second digit of the 

 manus, and a marked upward extension of the cnemial crest of the 

 tibio-tarsus. 



The skull has supraorbital grooves, which attain an extreme 

 development in Diomedea, but are always separated by a wide bar. 



The tarso-metatarsus is very like that of the Gavise, but the 

 inner lidge of the talon is smaller, and there are frequently two 

 closed tubes for the flexor tendons. The tibio-tarsus is distin- 

 guished by the extension of the cnemial crest above the proximal 



