Philosophical Institute of Canterbury. 429 
but that the line of junction is still visible, where also a similar variety of 
form can be traced. 
The difference in size between Dinornis maximus and Dinornis robustus, 
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 robustus, 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, 
апа the two smaller male and female of the other. A considerable difference 
in size occurs between the smallest species of Meionornis caswarinus and the 
largest species of M. didiformis. ln 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 oweni, male and female, with each other, a similar distinct gradation 
is observable. 
Palapteryx 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 Meionornis 
casuarinus and didiformis applies equally to this remarkable 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 Harpagornis moorei. Another 
remarkable species is a ralline form of gigantic size, Aptornis, of which we 
obtained sufficient material for оленя. 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 remarkable 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 occurrence. 
Of other species we obtained bones of Apteryæ, Stringops, Ocydromus, 
