or Red Disks of the Mammiferous Animals, 2)^ 



54-. Common Otter, full-grown, {Lutra vulgaris). Most 

 common sizes l-3600thand l-3200th. Extreme diameter, 

 l-4572nd and l-2910th of an inch. Blood from right ventricle, 

 and from renal artery and vein. 



55. Kangaroo, adult male, {Macropus Bennettii), Most 

 common diameters 1 -3600th and l-34<32nd 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, ?idx\[t kma\Q,{Petaurus Sciurus). Ave- 

 rage-sized disks l-3600th. Extreme diameters l-4<800th and 

 l-3000th of an inch. Blood from a prick in the nose. 



57. Ursine Opossum, adult male, [Dasyurus Ursiiius). Most 

 frequent sizes l-3428th and l-3600th. Extreme diameters 

 l-4-365th and l-3000th. Thickness of the edges of the disks 

 from l"10,000th to l-12,000th of an inch. Blood from a 

 vein in the ear. 



58. Another species, {Dasyurusviverrinus). 1 -4000th a very 

 common diameter of the disks; l-^SOOth and 1-3554'th were 

 also the sizes of several of the disks. Blood from the left 

 ventricle. 



59. The Perameles, [Pera^neles 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 albifrons). 

 Size of corpuscles very variable, from l-4800th to l-3000th. 

 The most frequent diameter l-3600th. Blood from both ven- 

 tricles, fi'om the splenic and portal veins, and the disks ap- 

 parently identical in all. 



61. Sambur Feer, adult buck, [Cervus hippelaphus). Dry; 

 size very variable, l-4000tli and l-3600th most common. 



Phil. Mag. S. 3. Vol. 16. No. 100. Jan. 1840, D 



