May, 183. THE MOAS OF NEW ZEALAND. 375 
Palaptevyx, there is no apparent reason for separating them. Take 
the next genus, Anomalopteryx, the maximum ratios of both its tibiae 
and femora fall between the maximum and minimum of the genus 
preceding it, while the maximum ratios of the metatarsus, tibia, and 
femur of Cela—-the genus following in succession—fit between the 
maximum and minimum of those in Anomalopteryx, while the ratios 
obtained from the metatarsus, tibia, and femur, in the next genus still, 
Mesopteryx, fit also between the highest and lowest ratios in Cela. It 
is evident that these ratios are valueless for differentiating the various 
bones into their proper genera by measurement alone, as is done in 
this paper. Indeed, if Mr. Hutton has correctly assigned to the 
genus Euryapterx three types of skull, why may not many of the 
varieties or types of cranium of Moa which we know not have 
belonged to one genus, even species, just as the cranium of Gallus or 
Columba does? It is also only in a few cases known certainly to 
what crania the numerous separated beaks belong, most of them 
having been only fitted together. 
Turning to the question of species, the metatarsus of Dinornts 
maximus is separated from that of D. excelsus by extreme difference of 
‘5 inch in length and 1°25 in girth, and by a mean difference in the 
two species of 5 inch in length and of *7 in girth; while associated 
together as D. validus, we have metatarsi varying as much as 1 inch 
in length and ‘8 inch in girth. The difference between the minimum 
tibia of D. maximus and the minimum tibia of D. excelsus, is 1°5 inch 
in length and 1 inch in girth, while we have tibia differing by 1°5 inch 
in length and in girth of 1:2 inch assigned to the one species, 
D. validus. Again, the maximum metatarsus assigned to D. giganteus 
lies midway between the greatest and least metatarsus assigned to 
D. validus ; the minimum tibia assigned to the former is intermediate 
between the largest and smallest of the latter ; while the maximum 
femur of D. giganteus is identical with the minimum femur of D. validus. 
The greatest difference in the metatarsi between the largest D. validus 
and the smallest D. giganteus is only *5 of an inch in length, and 1°8 
in girth; in the tibiz 2inchesin length and 1°2in girth; in the femora 
t inch in length and 1-4 girth. If we compare D. rvobustus with 
D. firmus, we find, 
A mean 
In D. robustus. In D. firmus. difference of 
Length. Girth. Length. Girth. Length. Girth. 
Metatarsus  .. 17°2-15°7 67-5°2 «.. I70-15°75 56-475 .. ‘08 78 
AMEE Se .. 32°7-300 68-62 .. 33'0-30'0 O5=513 set 3S ‘60 
Femur .. -.- 15°5-144 8 1-7'2 .. 15'25-14'5 PEACE on Wy, CS 
Take another instance, and compare D. ingens with D. firmus :— 
D. ingens. D. firmus. Difference. 
Length. Girth. Length. Girth. Length. Girth. 
Metatarsus Ta L525 4°75 40 15°75 4°75 aE "50 ‘00 
Tibia = 22 29550 5°30 He 30°0 5°30 fe “50 “00 
Femur .. ELAS 5 7°25 ot 15°25 7°50 Ao 2) "25 
Is there any real reason why these metatarsi, tibia, and femora 
