183 CAEINAT^. 



32244. The slightly imperfect right metacarpus. 



32244 a. A smaller and more imperfect right metacarpus. 

 32173 c. The sacrum and greater part of the left innominate. 

 32173 d. The imperfect right innominate. 



32173 e. The acetabular region of the right innominate. 



32245. The distal part of the right tibio-tarsus. The characteristic 



form of the bridge over the extensor tendons is well 

 shown. 



32245 a. The distal portion of the right tibio-tarsus of a smaller 



individual. 



32245 b. The proximal portion of the left tibia, showing the large 

 cnemial crest. 



32233. The right tarso-metatarsus. The conversion of one of the 

 grooves of the talon into a closed tube at once distinguishes 

 this bone from the tarso-metatarsus of Diomedea. 



32233 a. A somewhat larger left tarso-metatarsus, with the 

 extremities imperfect. 



32229. An associated series of cervical and dorsal vertebrae. The 

 posterior cervicals exhibit verj' clearl)' the extreme short- 

 ness of the neural region and the great lateral expansion 

 of the zygapophyses, which are so characteristic of this 

 group. 



Genus DIOMEDEA, Linn.' 



All the species are of very large size. The skull has the supra- 

 orbital groove of great depth : the beak being very long, with small 

 nares, approximated to the lachrymal, and no vacuity on the oral 

 surface of the prem axillae. The tarso-metatarsus (fig. 42) is 

 moderately shoit and stout, with a deep channel on the anterior 

 surface, and a sharp ridge on the outer border of the posterior 

 surface ; the talon has one deep outer groove and two shallow inner 

 grooves ; the distal trochlese are slightly expanded, the second only 

 slightly shorter than the fourth, and but little reflected, and the 

 foramen situated on the vertical line between the third and fourth 

 trochlea relatively high up. The humerus is greatly elongated, 

 with a shallow subtrochanteric fossa, which contains a pneumatic 



' Svst. Kat. cd. 12, lol. i. p. 214 (I'iW). 



