120 DR. J- Gt. BE MAN OK THE PODOPHTHALMOUS 



The external orbital angles are extremely acute and directed 

 transversely outwards and slightly forwards. As in 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, vrhich 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 maxiUipedes, 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. Dussumieri 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. triangularis 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 



