82 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
glabrous and smooth. The upper surface is armed with five 
spines, two along the inner margin (viz. one in the middle and 
one above the articulation of the mobile finger), and three along 
the external margin, viz. one at the articulation with the wrist, a 
second a little beyond the middle, and the third above the 
articulation of the mobile finger. The shape, structure, and 
armature of the fingers are quite similar in both species. 
The ambulatory and the natatory legs wholly resemble those of 
G. eruciferum, and consequently the meropodites of the natatory 
legs are very broad and sulcate, the proportion of their length and 
breadth being as 6:4, and the grooves on their upper (outer) 
surface are hairy. The penultimate joint presents the same 
elongated form, and its posterior margin has only traces of two 
or three minute teeth. As regards the shape of the male abdo- 
men, both species perfectly agree with one another. 
G. affine may therefore be distinguished from G. eruciferum 
(1) by its smaller size, (2) by the different shape and form of the 
first antero-lateral tooth, (8) by the internal suborbital lobe being 
much more prominent, (4) by the presence of three longitudinal 
crests on the outer surface of the hands. 
Young specimens of G. cruciferum have, however, still to be 
examined in order to ascertain whether they present the same 
characters as the adult. 
G. affine, Dana, 1s a rare species, which has hitherto been 
recorded only from the seas of Singapore. 
Besides the well-known G. cruciferum, Fabr., and G. natator, 
Herbst, there is still a fourth species of Gontosoma, in which the 
first antero-lateral tooth of the carapace is truncated and slightly 
excavated, namely, G. miles, de Haan, from the Japanese seas. 
This species, however, differs from G. affine (1) in its larger size, 
(2) by its narrower cephalothorax, (8) by its more acute frontal 
teeth, and especially (4) by its more elongated anterior legs, the 
merus-joints of which are armed with four strong teeth ante- 
riorly, and by its hands having their outer and under surfaces 
covered with minute granules and squamose granular lines. 
58. GONIOSOMA MERGUIENSE, n. sp. (Pl. V. figs. 3 & 4.) 
? Synon.: Goniosoma spiniferum, Miers, Report on the Zoological Col- 
lections made in the Indo-Pacific Ocean during the Voyage of H.M.S. 
‘Alert,’ 1884, p. 233, pl. xxiii. fig. C. 
A thorough revision of the genus Gloniosoma is much needed, 
