niNORNTTHID-f:. 229 



as in No. 1S591 (p. 227), but the width of the distal 

 extremity is somewhat greater, heing 0,097 (3-8 inches). 

 The distal e.vtremity of the tarso-metatarsus is also more 

 expanded than in No. A. 9G. In these points, therefore, 

 these specimens approximate to D. maximns, although 

 in the slender form of their shafts they resemble typical 

 examples of D. novtp-zealmulice. Purchased, 1881. 



The folhwing specimens are regarded as belonging to immature 

 individucds of this species. 



21750 X. An associated series of twelve imperfect cervical vertebrae ; 

 from the menaccenite bed of Te Rangatapu. These spe- 

 cimens exhibit evident signs of immaturity in their rough 

 external surface. The centra are much less constricted 

 laterally than in adult vcrtebrfe, the valley between the 

 prczygapophyses (especially in the anterior vertebrae) is 

 less deep, and there are lateral pneumatic foramina in the 

 centra which completely disappear in the adult. There 

 are pneumatic foramina in the lamina of the arch, which 

 are found in some adult vertebrae of D. maximns, but 

 absent in others. The great elongation of the centra is 

 decisive as to the genus of the specimens. 



Mantell Collection. 



21750. An imperfect middle cervical vertebra belonging to an older 

 individual ; from the same locality. Nearly the whole of 

 the centrum is wanting, Mantell Collection. 



21728. An imperfect anterior (3rd or 4th) cervical vertebra pro- 

 bably belonging to an immature individual of this species ; 

 from the same locality. The elongation is much greater 

 than in equal-sized specimens of the corresponding vertebra 

 of the succeeding genera. AlanteV Collection, 



Dinornis maximus, Owen \ 



Syn. Dinornis rohustus, Owen" (in parte). 

 Dinornis fjif/anfeus, Owen (in parte). 



' Trans. Zool. Soc. vol. vi. p. 497 (18G8). 



^ This name was originally given in Trans. Zool. Soc. vol. iii. p. 321 (1847), 

 as D. ingens, var. robiistus. On jjage 346 of the same vol. (1848) it appeared 

 as Talapteryx iiu/etis, var. rohustiis; as Pcdaptcryx rohusfus in vol. iv. p. 90 

 (183U); ai\cl as binoriiis roUn^fiis on p. Ui3 of the fiftii \ol. (18.5.3). 



