REPOET ON THE AMPHIPODA. 1515 



especially at the apex ; the finger slender, curved, between half and a third of the length 

 of the fifth joint. 



Second Perasopods similar to the first, but with the first joint rather more slender 

 and sinuous, and the third, fourth, and fifth joints longer. 



Third Perasopods. — The first joint not so long as the remaining joints together, 

 oblong, a little widened in the upper half, the front margin descending a little below the 

 hinder, the produced portion being narrow, with no flat distal margin ; the third joint 

 broader than the fourth but shorter, the hind margin descending a little below the finely 

 pectinate front margin, so that the distal border is oblique ; the fourth joint broader than 

 the fifth but a little shorter, the front margin pectinate ; the fifth joint almost straight, 

 the pectination of the front margin more oblique than in the other two joints ; the 

 finger slender, smooth, apically a little curved, half the length of the fifth joint. 



Fourth Perasopods. — The first joint much longer than all the remaining joints together, 

 the front margin nearly straight but with a little lobe at the base, the hind margin 

 convex, the distal margin oblkpie, between half and a third of the greatest breadth of the 

 joint, the front corner with some minute serration and the margin itself with some 

 microscopic pectination or striation ; the narrowly rounded apical lobe of the hind margin 

 fully reaches the flattened distal end of the front of the joint ; the short second joint 

 placed at the top of the distal division of the first, not long enough to reach the lower 

 end of the slit; the third joint with the front margin strongly pectinate, the teeth 

 directed a little backwards, the apical prolongation of the front broad, completely over- 

 lapping the fourth joint and reaching beyond it ; the fourth joint very finely pectinate 

 on the front margin, about as long as the proximal portion of the third joint ; the 

 fifth joint a Uttle longer than the fourth, finely pectinate on the front margin ; the finger 

 little more than a third the length of the fifth joint, very finely pectinate. 



Fifth Perasopods. — Side-plates with the slightly convex hind margin much deeper 

 than the straight front, so that the lower margin is very oblique. The first joint about 

 as long as the greatest breadth of the first joint in the preceding pair, the greatest breadth 

 about a third of the length, the front margin concave, the hinder convex, the apex narrow ; 

 the second or terminal joint narrowly oval, between a third and a fourth of the length of 

 the first joint, about three times as long as broad. 



Pleopods. — The peduncles showing hexagonal markings ; coupling-spines small, without 

 lateral teeth ; cleft spine with a very narrow dilatation ; eight or nine joints to each 

 ramus. 



Uropods. — Peduncles of the first pair pectinate at the apex of the outer margin, not 

 longer than the outer ramus, which is narrower and a little shorter than the inner, and 

 reaches a little beyond the telson ; both rami strongly pectinate on two edges, with the 

 apex acute, free from teeth ; peduncles of the second pair shorter than those of the first 

 pair, the rami thinly laminar, apically rounded, the outer shorter than the inner, both 



