216 EATIT^. 



Tho females arc larger than the males ; and the feathers have no 

 aftcrshafts. In addition to the sexual difference great individual 

 variation in point of size is observahle in Ai>teryx oiveni ' ; a 

 circumstance which affords grounds for considering that an equal 

 variation may have obtained in the Dinornithidic. 



Genus APTERYX, Shaw \ 



The type genus. In the tarso-metatarsus the two foramina above 

 the tubercle for the insertion of the tibialis anticus are situated in a 

 deep depression on the same horizontal line ; and there is a foramen 

 in the groove between the third and fourth trochleae. 



3[ptfvi))f au^traltS, Shaw ^ 



The type species. Of large size and stout build, with a very long 

 rostrum. The tarso-metatarsus (fig. 53, C) is stout, the lower part 

 of its anterior surface somewhat convex, and its third trochlea 

 with a moderate peduncle ; the proximal extremity is wide, and 

 the foramen between the third and fourth trochleae opens on the 

 flat surface of the bone. 



llah. New Zealand (South Island). 



46647. Two specimens of the cranium, wanting the extremity of 

 the rostrum ; from a limestone fissure at Timaru, South 

 Island. These specimens, which were obtained in associa- 

 tion with remains of Ajptomls, agree in all resjiects with 

 recent examples. 



Presented hy Sir li. Owen, K.C.B., 1S75. 



A. 156. The right femur ; from a superficial deposit at Nelson, 

 South Island. No history. 



A. 156 a. The left tibio-tarsus ; from Nelson. The deep extensor 

 groove, with the absence of a bridge, is well shown. 



No history . 



A. 156 b. The left tarso-metatarsus ; from Nelson. This speci- 



(Fiy.) men (fig. 53, C), which accords with recent examples of 



the same bone, has a length of 0,074, and a width at the 



proximal extremitj' of 0,020. No history. 



1 See Buller, 'Eirds of New Zealand,' p. 3fi6 (1873). 

 - ' Naturalist's Miscellany,' vol. xsiv. pi. 1057 (1813). 

 ^ Loc. cif. 



