FhilosojiMcal Instihite of fkmterhury. 429 



but that the line of junction is still vi«ible, where also a similar variety of 

 form can be traced. 



The difference in size between Dinornis maxivius and Dinor'nis rohustus, 

 the next in size, is very marked and constant. Of the latter we obtained a 

 series of two sizes, of which the largest might be assigned to the female. 



Between Dinornis rohustus, ingens, gracilis, and struthioides, besides their 

 well-defined specific characters, there are also distinct breaks ; each species 

 possessing at the same time two constant sizes. 



Of Meionornis casuarinus a series of four clearly-defined sizes are in our 

 possession, so that we might conclude that we have two closely-allied species 

 before us, of which the two largest sizes represent male and female of the one, 

 and the two smaller male and female of the other, A considerable difference 

 in size occurs between the smallest species of Meionornis casuarinus and the 

 largest species of M. didiformis. In the latter we can distinguish also four 

 sizes with a gradation similar to that observed in the former, so that I am led 

 to believe that this species, like M. casuarinus, consists of two sub-species. 



If we compare two skeletons of Apteryx australis, male and female, and two ■ 

 of Apteryx oioeni, male and female, with each other, a similar distinct gradation 

 is observable. 



Pala.pferyx elephantopus has also four well-distinguishable subdivisions, of 

 which the largest size is the most conspicuous and best marked, so that the 

 suggestion ventured concerning two sub-species belonging to Ileionornis 

 casuarinus and didiformis applies equally to this remai'kable extinct bird. 



The division between this and the next species Palapteryx crassus is well 

 marked, consisting, moreover, of two constantly-maintained sizes. 



Euryapteryx gravis and rheides, which can easily be distinguished at a 

 glance from each other, not only by their size but by their anatomical 

 characteristics, consist each of two sizes only, to be attributed, as I suppose, 

 likewise to difference of sex. 



Amongst other species of extinct birds, of which the Glenmark turbary 

 deposits have yielded remains, there is, first, the huge diurnal bird of prey which 

 I described under the specific term of Harjmgornis moorei. Another 

 remarkable species is a ralline form of gigantic size, Aptornis, of which we 

 obtained sufficient material for articulation, and which is closely allied to 

 Ocydromus, the woodhen. 



The remains of Cnemiornis, a gigantic goose, as first pointed out by 

 Dr. Hector, have hitherto been very scarce, so that we possess only a few 

 bones of it. It is remai-kable that the excavations undertaken during a 

 number of years did not yield a single bone of Notornis, which, therefore, either 

 did not inhabit this part of the country, or was of extremely rare occuiTence. 



Of other species we obtained bones of Apteryx, Stringops, Ocydromus, 



