120 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
The external orbital angles are extremely acute and directed 
transversely outwards and slightly forwards. Asin G. annulipes, 
the upper orbital margin is bordered anteriorly by a minutely 
granulated accessory line, between the front and the orbital angle ; 
this line is situated in this species nearer to the orbital margin 
than in G. annulipes. The oblique line on the lateral surface 
of the cephalothorax is even shorter than in G'. annulipes, being 
almost absent. The lateral margins, consisting therefore almost 
exclusively of the postero-lateral portion, are directed very 
obliquely backwards, and, as in G. annulipes, they do not extend 
to the posterior margin. The inferior orbital margin resembles 
that of G. annulipes, but is more delicately crenulated. In the 
female the accessory line of granules, which is a character of the 
female of G. annulipes, does not occur in this species. 
In the structure of the under surface of the carapace, of the 
external maxillipedes, of the convex and hairy pterygostomian 
regions, &¢c., this species is similar to G. annulipes. The 
suborbital groove, between the orbits and the pterygostomian 
regions, which I found also in G. Dusswumiert and in G. acutus, 
occurs in this species and in G. annulipes, and is probably 
present in all the species of Gelasimus. The fifth joint of the 
male abdomen in G. annulipes is much broader than long and 
nearly as long as the sixth, whereas in G. trianqgularis the fifth 
joint is but little broader than long and much longer than the 
fourth and the sixth. 
Among twenty-one males, the larger hand in eleven was 
found on the left, and in ten on the right side. The larger 
chelipede presents a striking resemblance to that of G. annulipes, 
but differs from it in some constant characters. The anterior 
margin of the arm bears a few small tubercles along its whole 
length, and the other margins are also minutely granular. The 
upper margin, moreover, is less rounded than in G. annulipes and 
is somewhat more acute. The inner, equally hairy surface of 
the arm in this species appears therefore more distinctly limited 
than in the other species. The wrist is similar to that of 
G. annulipes, the upper surface being minutely granular and 
the anterior margin often presents some small tubercles. The 
hand is nearly once and a half as long as the distance be- 
tween the external orbital angles and is nearly three times as 
long as high. In its outer appearance it closely resembles the 
hand of G. annulipes, in the shape of its palm and the forms 
