Zoology. 5 129 
ted form of cell, In some of the invertebrata, corpuscles are found 
which appear to be the nuclei of some of the nucleolated cells become 
free ; and these the author considers to be abortions, rather than exam- 
ples, of cells having attained their third phase of free cells. Corpus- 
cles are also met with in these animals, in greater or less abundance, 
belonging to the lowest forms of organic elements, namely, elementa- 
ry granules. 
The comparison which the author institutes between the blood-cor- 
puscles of the vertebrate and invertebrate divisions of the animal king- 
‘dom, tends to show that they in all cases pass through similar phases of 
development, except with respect to the last, or colored stage of the nu- 
cleolated cell, which they do not attain in the lower classes of animals. 
He finds that the blood-corpuscles of the crab, according to an analysis 
made by Professor Granam, contain a sensible quantity of iron, perhaps 
as much as red corpuscles. He considers the corpuscles of the blood 
of the invertebrata, in as far as relates to the absence of nucleolated | 
cells, as resembling those of the lymph of vertebrate animals. 
n the Extinct Mammals of Australia, with Additional Obser- 
vations on the genus Dinornis of New Zealand ; by Professor OwEN, 
(Mag. Nat. Hist. xvi, 1845, p. 142.)—In a previous report Professor 
Owen had demonstrated the former existence in Australia of two gen- 
era of Marsupial animals, rivalling in size the rhinoceros and hippo- 
potamus of the old continent. Since the reading of his first report, 
Prof. Owen had received three molar teeth belonging to the upper jaw 
of the Diprotodon ; the crown of each tooth was divided into two prin- 
cipal transverse ridges, like those of the lower jaw, and the enamel 
presented the wrinkled and punctate surface peculiar to the genus. 
With these was found a large scalpriform incisor, whose bevelled cut- 
ting edge showed that it worked upon a similar tooth in the lower jaw. 
The Diprotodon, therefore, had molars like the kangaroo; but, instead 
of the two large incisors in the lower jaw being opposed to six smaller 
in the upper, as in the kangaroo, it had two large incisors above as well 
as below, agreeing in form and structure, and relative size, with those 
of the Wombat. Prof. Owen considered himself justified in conclu- 
ding that the Diprotodon combined the characters of Phascolomys with 
those of Macropus, exhibiting both upon a gigantic scale, and constitu- 
ting one of those links in the chain of being which the course of time 
has broken and destroyed. Prof. Owen also stated that a large collec- 
tion of bones of the Dinornis had been obtained from a new locality by 
Mr. Percy Eats. This collection contains four of the species of Di- 
nornis already described, including the three most rema ble 
gigantic stature. One of these, with a stature nearly equalling the 
ostrich, presents inall the bones of its leg double the thickness in pro- 
Sxconp Series, Vol. I, No. 1.—Jan. 1846. 1 a 
ai, aaa 
