TWO-TOED SLOTH. 157 
more uniform or less varied tinge; having no 
marks or shades of black and ferruginous as in 
the former; and^ in particular, is strikingly dis- 
tinguished, as a species, by having only two claws 
on the fore feet: it is also a much more active ani- 
mal, and, even when imported into Europe, has been 
known, according to the testimony of the Count 
de Buffon, to ascend and descend from a tall tree 
several times in a day; whereas the three-toed 
Sloth with difficulty performs that operation in a 
whole day ; and can scarce crawl some hundred 
yards in the space of many hours. The disposi- 
tion of the hair on the head of the two-toed Sloth 
differs also from that of the former animal, and is 
directed immediately backwards, without being 
in the least reversed round the front as in that 
species. A very fine specimen may be seen in 
the Leverian Museum ; and a young one not 
much larger than a Squirrel, and of a very light 
or whitish colour is in the British Museum, as 
well as a more advanced specimen, preserved in 
spirits. 
In Mr. Carlisle's description of the remarkable 
disposition of the trunks of the subclavian and 
iliac arteries in the Lemur tardigradus, he very 
properly observed, that it would be of some im- 
portance in physiology to ascertain whether the 
other slow-moving Quadrupeds have any peculiar 
arrangement of the arteries of their limbs," the 
single fact above recorded being hardly suffi- 
