218 G. M. Giles — Six new Am/phi;pods from the Bay of Bengal. [No. 2, 



The thorax is long, narrow, depressed rather than compressed, 

 the first two dorsally visible segments scarcely separable. The third 

 has the inferior angle of its plenron produced into a sort of triangular 

 spine, overlapping the second. The fourth and fifth, of nearly equal 

 length, form the widest portion of the body ; the sixth longer and 

 narrower than these ; and the last, the longest and narrowest of all, 

 is provided behind with a spine on either side of the middle line and 

 has this posterior border considerably everted, so as to admit of 

 hyperextension of the abdomen on the thorax. 



The 5th, 6th, and 7th thoracic appendages are provided with 

 branchial sacs, the hindermost being the largest. In the gnathopoda, the 

 coxal extension of the pleura is considerable, and extends well below the 

 level of any of the rest. The gnathopoda are on the same general plan 

 as those of the first species, but are much longer and more slender, and 

 their subchelse are far less developed, being represented, in the anterior 

 of the two, by a process some distance from the inferior extremity of the 

 carpopodite, and, in the posterior, by a small projection half way along 

 its length (this is if anything somewhat exaggerated in the drawing) . 

 The 4th is considerably the longest of all the appendages. It is, 

 however, very slender, both the 5th and 6th exceeding it in stout- 

 ness. It equals in length the thorax and first two segments of the 

 abdomen, and to all appearance consists of but five joints, the dacty- 

 lopodite being represented only as a minute hair-like body. The 

 propodite is very long and tapering, forming nearly a third of the length 

 of the limb. The carpopodite, meropodite, and basipodite are long and 

 cylindrical, and the ischiopodite is short and quadrangular. The 5th 

 closely resembles the preceding, but is shorter than it by the length of 

 the basipodite, the carpopodite being less than half as long as that of the 

 3rd, The postero-inferior angle of its ischiopodite is prolonged into a 

 spine, and the posterior border of its much stouter basipodite is armed, 

 along the distal half of its posterior border, with three strong serrate 

 spines. The 6th is considerably the stoutest of the series, and equals 

 the thorax and first segment of the abdomen in length. The dactylopodite 

 is represented only by a minute hair-like body, the propodite, long and 

 falciform, the carpopodite, a long flattened body, the opposible inferior 

 border of which is but of small extent, is armed along its anterior 

 border with six powerful serrations, so that the extremity much more 

 resembles the sabre of a Squilla than a subchela. The mero- and ischio- 

 podites are short and triangular, each having the anterior border armed 

 with two serrations. The basipodite, cylindrical above, is three-sided 

 below, each border ending in a strong spinous process, in addition 

 to which the anterior border is armed with three stout, and the posterio 



