REPORT ON THE AMPH1PODA. 1613 



a small convex palm ; the finger curved, small, yet more than half the length of the 

 hand and reaching much beyond the palm, having a little denticle on the concave 

 margin. 



Second Gnathopods longer than the first, with all the joints longer, but very 

 similar ; the pectinate palm of the hand is more strongly convex, while the front 

 margin of the hand is much less so ; the finger is much more than half the length of 

 the hand. 



First Perseopods. — First joint widening distally, with concave front margin, not 

 very elongate ; the second joint not longer than broad, with a little pectination of the 

 convex hind margin ; the third joint oval, broader and scarcely shorter than the first 

 joint, almost filled with gland-cells, the front margin fringed with little spinules ; the 

 fourth joint a little broader than the fifth, but much shorter ; the fifth narrow, slightly 

 curved, shorter than the third, both this and the fourth joint having spinules along the 

 front margin ; the finger long and slender, more than half the length of the fifth joint, 

 curved at the tip. 



Second Perseopods differing little from the first except in their greater size, which 

 chiefly depends on the longer third joint, the fifth joint also being rather longer than in 

 the preceding pair, but very decidedly shorter than the third joint. 



Third Perseopods. — Branchial vesicles lying parallel to the body, much larger and 

 more conspicuous than the three preceding pairs. This pair of limbs the longest ; 

 the first joint very moderately dilated, the front margin faintly serrate and still 

 more minutely pectinate on the front margin ; the second joint scarcely longer 

 than broad, with the convex front margin slightly pectinate ; the third joint narrower 

 than the first and a little shorter, having a very small portion of its space occupied by 

 muscles ; the fourth joint little more than half as long as the third ; the fifth slender, 

 a little curved, nearly as long as the third, having like the two preceding joints small 

 spinules along the front margin ; the finger slender, about a third as long as the fifth 

 joint. 



Fourth Perseopods very similar to the third, but considerably shorter, the first joint 

 rather longer and broader, but the third shorter and much narrower, the fourth joint 

 also smaller in proportion, and the fifth joint not very much longer than the fourth ; 

 the finger straight, acute, about half the length of the fifth joint. 



Fifth Perseopods. — The lower part of the segment (corresponding to the side-plate) 

 having the angles rounded both before and behind, the front part of the lower margin 

 a little excavate. The first joint of the limb small, scarcely reaching below the margin 

 of the segment, expanded so as to form a sort of triangle, with the sides nearly equal 

 and more or less convex ; the apex below seems to be formed by a partially 

 coalesced second joint, from which projects an extremely minute two-jointed appendage, 

 of which the terminal joint is acute. 



