33 
or Red Disks of the Mammiferous Animals, 
54-. Common Otter, full-grown, {Lutra vulgaris). Most 
common sizes l-3600thand l-3200th. Extreme diameter, 
1 -4572nd and 1-29 10th of an inch. Blood from right ventricle, 
and from renal artery and vein. 
55. Kangaroo, adult male, (Macropus Bennettii), Most 
common diameters l-3600th and l-3432nd of an inch ; and 
the following sizes were rather frequent : l-4000th, l-3200th, 
and l-3000th. Blood from a prick at the end of the tail. 
56. Flying Opossum, adult female, (Petaurus Sciurus), Ave- 
rage-sized disks 1 -3600th. Extreme diameters 1 -4800th and 
l-3000th of an inch. Blood from a prick in the nose. 
57. Ursine Opossum, adult male, (Daspurus Ursinus), Most 
frequent sizes 1 -3428th and 1 -3600th. Extreme diameters 
1 -4365th and 1 -3000th. Thickness of the edges of the disks 
from 1-1 0,000th to 1- 12,000th of an inch. Blood from a 
vein in the ear. 
58. Another species, (Dasyurusviverrhius). 1 -4000th a very 
common diameter of the disks; 1 -4800th and 1 -3554th were 
also the sizes of several of the disks. Blood from the left 
ventricle. 
59. The Perameles, (Perameles lagotis). Common sizes 
1 -4572nd and 1 -4000th of an inch. Several disks were seen 
of the following diameters: l-4800th, l-3428th, and l-3200th. 
Blood from a prick in the ear. 
Thus the blood disks of these five Australasian animals 
agree in form and size with the red particles most common in 
other mammals. 
Since the foregoing paper was printed I have examined the 
blood of some other mammiferous animals. I subjoin the 
notes in the order they happen to have been made. All the 
observations will soon be systematically arranged, so as to 
exhibit in some measure the relation between the blood cor- 
puscles and the organization of the animal. The blood par- 
ticles of the different species of the genus Cervus, Antilope, 
and the congeners of the Napu Musk Deer, appear to me to be 
especially deserving of further observations ; and it is very 
probable that any physiologist who may prosecute the inquiry 
will be rewarded with some interesting results. 
60. White-fronted Lemur, adult male, (Lemur alhifrons). 
Size of corpuscles very variable, from l-4800th to l-3000th. 
The most frequent diameter l-3600th. Blood from both ven- 
tricles, from the splenic and portal veins, and the disks ap- 
parently identical in all. 
61. Sambur Deer, adult buck, (Cervus liippelaphus). Dry; 
size very variable, l-4000th and l-3600th most common. 
Phil, Mag, S. 3. Vol, 16. No. 100. Jan, 1840. D 
