REPORT ON THE AMPHIPODA. 1477 



plates broad, their inner margins almost meeting ; there are a few little setules on the 

 surface. 



First Gnathopods. — The side-plates with the lower front angle acute. The first joint 

 long and straight, longer than the remaining joints together, with gland-cells ; the second 

 joint a little longer than broad, with a slender spine on the hind margin ; the third joint 

 shorter but rather broader than the fourth, with a slender spice above the apex of the 

 convex front margin, and three such spines on the hind margin ; the wrist similarly armed 

 and having also two or three surface-spinules ; the hind margin is straight, seemingly a 

 little pectinate, the front margin scarcely convex, so that the joint is of nearly uniform 

 breadth throughout, and projects a little on either side of the hand, which is much 

 narrower and shorter, tapering, armed with a few hairs ; the finger straight, acute, about 

 a quarter of the length of the hand. 



Second Gnathopods very similar to the first, but the first joint is longer and somewhat 

 curved ; the third joint is rather longer than the wrist, which is a little broader but not 

 longer than that of the first pair, with more spines along the hind margin ; the apex is 

 not in the least produced ; the hand is a little larger than in the first gnathopods but of 

 the same shape. 



First Perseopods much longer than the gnathopods ; the first and second joints very 

 like those of the second gnathopods but rather stronger ; the third joint rather elongate, 

 slightly curved, longer than the fourth, having two spinules at the upper and one at the 

 lower part of the concave hinder margin ; the fourth joint longer than the fifth, slightly 

 curved ; the fifth joint distally narrowed, having a few setules and some very minute 

 pectination along the almost straight hind margin ; finger slender, about a third or a 

 fourth the length of the fifth joint, a little bent. 



Second Peraeopods similar to the first, but with the joints more elongate except the 

 finger. 



Third Perseopods. — Side-plates not broader than deep, the lower hinder angle much 

 rounded, the inner process not very large, a little bent, directed more downwards than 

 backwards. The first joint elongate, much more than twice as long as the greatest 

 breadth, longer than all the other joints together, the hind margin not very strongly 

 convex, the front sinuous, produced in a rounded point a little below the hind margin ; 

 the short second joint lying across the narrow hinder part of the distal margin of the 

 first joint ; the third joint long, narrow, straight ; the fourth equal to the third in length ; 

 the fifth rather shorter than the fourth, a little curved, and like the two preceding joints 

 with insignificant armature ; the finger small, acute, not a fifth the length of the 

 preceding joint. 



Fourth Perasopods.—The first joint longer and broader than that of the preceding 

 pair, the front margin concave, the upper part of the hind margin very convex, below 

 this the joint narrows, with straight hind margin nearly parallel to the front but not 



