Zoological Society of London. 
475 
was minutely described and compared with the keel-less sternums 
of the existing Struthious birds; that of the Apteryx being de¬ 
monstrated to be most like the sternum of Dinornis. 
The following bones of the extremities, imperfectly or not at all 
known in 1843, were next described :— 
The entire femur of Dinornis giga?iteus. Entire tibiae and 
tarso-metatarsi of Din. giganteus, indicating a robust variety of 
this stupendous bird to have existed in the Middle Island. 
The tarso-metatarsus of Dinornis ingens from the North Island, 
distinguished by a rough depression indicative of a fourth or 
back-toe, and consequently a genus (Palapteryx) distinct from 
Dinornis. 
Femora, tibiae, and tarso-metatarsi of a Dinornis of the height 
of the Din. ingens, but of more robust proportions, from the 
Middle Island ; with a feeble indication of a surface for a back-toe. 
The tibiae and tarso-metatarsi of Dinornis (Palapteryx) dro- 
mioides from the North Island, confirming by their long and 
slender proportions the conjecture hazarded in the author’s former 
memoir (Zool. Trans., vol iii., pp. 252, 264). The tarso-meta¬ 
tarsus also shows the rough elliptical surface for the attachment 
of the back-toe, indicating the Din. dromioides to belong to the 
same generic or subgeneric section as Din. ingens from the 
North Island. 
Femora, tibiae and tarso-metatarsi, from the Middle Island, 
were next exhibited and described, which establish a new species, 
for which Prof. Owen proposed the name of Din. casuarinus: a 
small and feeble depression, five lines by three lines, indicates that 
this species had a back-toe in the corresponding position with 
that in the Apteryx, but more rudimental. 
A very remarkable femur and tarso-metatarsal bone, also from 
the Middle Island, were exhibited, belonging to an additional tri- 
dactyle species, to which the name of Dinornis crassus was given. 
Of this species the author remarks:—“ With a stature nearly 
equal to that of the Ostrich, the femur and tarso-metatarsus 
present double the thickness in proportion to their length. It 
must have been the strongest and most robust of birds, and the 
