116 BR. J. G. DE MAN ON THE PODOPHTHALMOTJS 



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. Dussumieri 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 (PL 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 



