REPORT ON THE AMPHIPODA. 1505 



the border facing the hand four slender spaced teeth, the apex forming a fifth, near which 

 the hinder margin has three little teeth and some slight serrations ; the hand and finger 

 as in the first pair. 



First Peraeopods. — Branchial vesicles larger than the preceding pair, longer than the 

 first joint, The first joint widening distally, the second not longer than broad, with a 

 subapical spinule on the hind margin; the third joint distally widened, carrying two 

 spinules near the apex of the very convex front margin, and a longer one at the apex of 

 the hind margin ; the fourth joint rather longer than the third, with a spinule at the 

 front apex, a short and a long one on the hind margin ; the fifth joint longer and 

 narrower than the fourth, slightly curved and tapering ; the finger scarcely half the 

 length of the fifth joint, gently curved, tapering. 



Second Perseopods like the first, with the third, fourth, and fifth joints a very little 

 longer. 



Third Perseopods. — Side-plates with a small blunt process on the inner side. 

 Branchial vesicles not so large as the first joint. The first joint a broad oval, about as 

 long as the remainder of the limb, the front margin flattened, descending slightly below 

 the hind margin, having some spinules at the lower end ; the second joint with one 

 spinule on the front margin ; the third joint a little shorter than the fourth, distally 

 widened, with a spinule at the hinder apex and three spinules on the front margin ; the 

 fourth joint having a spinule at the hinder apex, two spinules on the front margin, all 

 the front of the joint minutely scabrous, the distal margin variously pectinate ; the fifth 

 joint much narrower than the fourth, rather longer, the hind margin convex, the front 

 nearly straight, with scarcely perceptible pectination ; the finger slender, tapering, curved, 

 not nearly half as long as the fifth joint. 



Fourth Perseopods. — Branchial vesicles smaller than the preceding pair. The first 

 joint longer than in the third peraeopods, widest proximally, most of the front margin 

 straight, descending below the hind margin, a row of eight spinules fringing the curve 

 which unites it to the distal margin ; the hind margin has some spinules or setules along 

 the convex upper part ; along a groove of the outer surface extending from the apex of 

 the front margin towards, but not reaching, the apex of the great longitudinal slit, a row 

 of little circular marks was observed, five in number, and a row near the upper margin of 

 the joint; the small second joint attached near the apex of the slit; the third joint as 

 long as the two following together, distally a little widened and produced in front for 

 nearly half the length of the following joint, the front margin pectinate ; the fourth joint 

 abruptly narrower than the third, its front margin pectinate ; the fifth joint finger-like, 

 tapering, much narrower than the fourth, but nearly as long, finely scabrous in front ; 

 the finger obsolete, perhaps represented by the acute apex of the fifth joint. 



Fifth Peraeopods slender and feeble ; the first joint not quite so long as the remainder 

 of the limb, not very broad, the front margin nearly straight, the hinder convex, the apex 



(ZOOL. CHALL. EXP. — PART LXVII. — 1888.) XxX 189 



