360 
ME. ST. G-EORG-E MI V ART ON THE SKELETON OF THE PRIMATES. 
The index is always shorter than the third digit, except in Man *. 
As compared with the whole pes, the index is longest in Simia and Cheiromys (nearly 
two-fifths of the length of the latter), and scarcely less in Lagothrix and Mycetes. In 
the rest the proportion is less, being least but one in Man, and least of all in Tarsius, 
where it is less than a quarter of the length of the pes. 
The third digit , as compared with the whole length of the pes, is longest in Loris, where 
it is more than half of the length of the latter, then in Cheiromys and Indris ; and in all 
the rest it is much above a quarter, except in Tarsius, in which it is only slightly so, and 
Man, where it is less than a fifth. 
As compared to its homotype, it is much shorter in Man, Simia, and Tarsius also, hut 
to a less degree in Cheiromys, the Simiinse, and others. 
It is never the shortest digit of the pes, but it is the longest one in the Simiidse, Ce- 
binae, and Mycetes. It projects most of the digits of the pes in the Simiidae and most Cebidse. 
Th e fourth digit is the longest of the pes inPithecia, sometimes in Nyctipithecus, and 
always in the Lemuroidea. 
It is never the shortest one, even without the hallux. It projects the most of the 
digits of the pes in Pithecia, sometimes in Nyctipithecus, in Hapale, and in all the Le- 
muroidea. 
The fifth digit is the longest one of the pes in none ; it is the shortest one in Man, 
but in him only. 
It is the shortest one, except the hallux, in the Simiidse and Cebidse, and it is about 
as short as the index in Hapale. The fifth digit projects more than the index in Pi- 
thecia, Hapale, and the Lemuroidea ; not so in other forms. 
The length of the longest digit, compared with that of the tarsus, is greatest in Loris, 
Arctocebus, Simia, and Indris (more than 160 to 100) ; it is least in Tarsius, Galago, 
and Man, in the last being only about half. 
The proportion borne by the longest digit to the longest metatarsal is greatest in Arc- 
tocebus and Perodicticus, where the first is near being twice and a half the length 
of the second. In Galago and Lemur it is also more than twice its length. In the rest 
it is more than once and a fifth as long, except in Troglodytes, the lower Simiidse, 
Chrysothrix, Hapale, and Man. In Man and some of the lower Simiidse it is shorter 
than the metatarsal. 
The relation between the proportion borne by the longest digit to the longest meta- 
tarsal, and that borne by the longest digit of the manus to the longest metacarpal, is so 
far uniform that, except in Perodicticus f, the first proportion is always smaller than the 
second. The difference between the two proportions, however, is almost nil in Simia, 
* Dr. Lucae says that the index is longer than the third digit in Troglodytes ( loc . cit. pp. 306, 307, and 320) ; 
also that in Cynocephalns mormon, the second and third digits are equal (loc. cit. p. 317). I am inclined to 
think that this variation may he owing to an error in mounting the specimens. 
f As Perodicticus was the only exception I found, I was inclined to suspect that the specimen in the British 
