214 Amphipoda and Isopoda 



long set* on the inner edge only, and also at the extremity of the 

 propodus. 



Third and fourth pairs of legs (Plate IV., Fig. 12) of similar 

 structure, rather slender ; hasal joint about equal in length to the 

 two succeeding joints combined ; merus longer than either the carpus 

 or propodus ; latter longer than the carpus ; nail rather more than one 

 quarter of the length of the propodus ; the whole limbs armed with 

 numerous long and short set* on their posterior margins, but no 

 spines. 



Seventh pair of legs (Plate IV., Fig. 13) long and slender ; basal 

 joint greatly expanded, longer than wide, with a row of short slender 

 spines on its anterior border ; carpus about one and a half times as 

 long as the merus ; propodus equal in length to, but narrower than, 

 the carpus ; nail rather more than one-quarter of the length of the 

 propodus ; the last three joints with a row of slender, short spines, 

 and numerous setae on their anterior border. 



First pair of uropods (Plate IV., Fig. 14) with the peduncle longer 

 than the subequal rami, and bearing a raised ridge, armed with short 

 spines. 



Second pair of uropods (Plate IV., Fig. 15) having the rami sub- 

 equal in length to each other and to the peduncle ; the inner ramus 

 with a marked constriction near the tip. 



Third pair of uropods (Plate IV., Fig. 16) with the peduncle shorter 

 than either ramus ; inner ramus very slightly shorter than the outer, 

 both edges minutely pectinate, the inner edge with six spines and the 

 outer edge with four ; outer ramus with a small terminal joint, the 

 inner edge minutely pectinate, and bearing a row of veiy short spines, 

 the outer edge with a single spine at the extremity of the basal joint, 

 and one about halfway along its length. 



Telson (Plate IV., Fig. 17) about one and a half times as long as 

 broad, deeply cleft for one-half of its length ; the apices of the lobes 

 of the cleft bear a small spine and two short set* ; there is a single 

 spine on the dorsal surface of each lobe about the centre of the whole 

 length of the telson. 



