CRUSTACEA OF THE MERGUI ARCHIPELAGO. 81 
depressed, and the two median teeth are most prominent. The 
second teeth are directed somewhat obliquely outwards and sepa- 
rated from the third, which extends straight forwards, by a fissure 
deeper and longer than that by which the first and the second 
teeth are separated. The fourth teeth, or internal angles of the 
upper orbital margin, are directed somewhat obliquely out- 
wards. 
The first antero-lateral tooth has a very characteristic form ; 
it is truncated and slightly excavated at its external margin, 
as in G. cruciferum ; but it projects much more forwards than 
in that species, as will be seen by a comparison of figs. 1 & 2 
Pl. V.; the second tooth is about the same size as the first, 
but is never larger than it, and it is rather acute, although 
without a dark point. The four posterior teeth are dark- 
pointed and acute; the third, fourth, and fifth teeth are directed 
straight forwards, but the last transversely outwards and 
slightly forwards. The last tooth is also a little longer than 
the anterior ones. Like the frontal teeth, those also of the 
antero-lateral margins are much depressed and flattened. The 
postero-lateral regions resemble those of G. cruciferwm, and are 
concave. 
The skape and the size of the internal lobe of the lower orbital 
margin are also characteristic of this species; for this lobe pro- 
jects a little more forwards than the internal lobe of the upper 
margin of the orbits, while in G. cruciferum the latter projects 
more forwards than the former. 
The subhepatic regions are hairy. 
The anterior legs are quite similar to those of G. cruciferum, 
in the relative length of the arms and chele and in their form 
and armature. ‘The anterior margin of the arms presents three 
spines; the wrist is armed with a leng spine at the internal 
angle, and with three small acute spines at the outer surface. 
The outer surface of the hands of G. affine presents two longi- 
tudinal minutely granulated crests near the smooth convex under 
margin, and between the upper margin and the ridge which 
is continued upon the immobile finger ; in G. eruciferwm only one 
crest is found on this place. The external surface of the hand 
of G. affine has therefore three, whilst that of G. cruciferwm has 
only two, longitudinal crest’ The outer and upper surfaces 
of the hands of G. affine are covered with short hairs ; whereas 
in this specimen of G. cruciferum these surfaces are perfectly 
LINN. JOURN.—ZOOLOGY, VOL, XXII. 6 
