116 DR. J. Ge DE MAN ON THE PODOPHTHALMOUS 
lens, and presents an impressed line parallel to the rounded 
under margin. The inner margin of the index is constantly 
armed with two teeth, one a little before the middle, the second 
a little before the acute extremity, and it moreover bears small 
tubercles along its whole length. In G. Dusswmieri the index is 
constantly armed with one single tooth, the distal tooth not 
being found in this species. It is therefore always possible 
to distinguish the species by this character. The two teeth of 
the immobile finger are, however, not always equally developed ; 
in most cases they are equal to one another, but sometimes 
the proximal tooth is a little larger. The thumb gradually 
tapers, though little, towards its hooked pointed extremity ; its 
outer surface appears to the naked eye minutely granular near 
its articulation; but the whole surface, when examined under a 
magnifying-glass, appears to be covered with minute granules. 
The outer surface presents two longitudinal grooves, which, 
however, disappear a little before the distal third of the length of 
the finger; the upper broader groove runs close to the upper 
margin, which appears granular near the base, and the other is 
a faintly impressed line near the middle of the surface. The 
inner surfaces of the palm and of the fingers agree with those of 
G. Dussumieri; the inner surface of the palm appears a little 
granular between the two oblique tuberculated crests, whereas the 
inner surface of the fingers is quite smooth. 
In younger individuals, in which the distance between the 
external orbital angles measures 19 millim., and the larger hand 
of which is 22 millim. long, the fingers are about as long or 
even a little shorter than the palm (PI. VIII. fig. 4), but the © 
distal tooth of the index is very little developed. Stimpson 
doubtless established the species on such a specimen. In very 
young male specimens, the fingers are much shorter than the 
palm. 
In G. acutus there is a remarkable variety, in which the 
inner margins of both fingers are quite unarmed between their 
base and the distal tooth (fig. 3), only the latter, which is charac- 
teristic of the species, being present. Amongst thirty-four adult 
male specimens five belong to this variety. 
The ambulatory legs much resemble those of G. Dussumieri, 
but the meropodites of the male are a little more enlarged, and 
