REPORT ON THE AMPHIPODA. 1440 



the lower part of the front margin being slightly convex and very shallowly serrate, 

 the hind margins straight ; the second joint channelled behind, the front margin with 

 an acute apex, very little produced ; the third joint distally rather broader than the 

 length, the front apex and one of the hinder apices acute, scarcely produced ; the fourth 

 joint with the apex of the hind margin acute, not produced ; the teeth of the front 

 margin reckoning from the base are, two small, a large one, two small, a very large one, 

 a small one, a very large one, two small oues, the last being double-tipped ; the fifth 

 joint is narrow, much shorter than the fourth, its extremity when folded back touching 

 the tip of the third tooth (reckoning from the base) ; the finger more than half the 

 length of the fifth joint, strongly curved apically. 



Fourth Perasopods. — First joint with convex front margin, having some faint distal 

 serration ; the third joint widening distally, the front apex acute, not produced, the 

 hinder apex not acute ; the fourth joint with three teeth along the front margin ; the 

 fifth joint much narrower than the fourth and a little shorter, its front margin spinulose, 

 the apical pectinate ; the finger much more than half the length of the preceding joint, 

 apically curved. 



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

 broad as the first of the preceding pair but not so long, the front margin bulging out 

 near the base, then straight, the hind margin convex, slightly crenulate ; the second and 

 third joints short, equal in length ; the fourth longer than the two preceding together ; 

 the fifth longer than the fourth ; the sixth shorter than the fourth, rather more than 

 half the front margin smooth and straight or a little convex, the remainder set 

 obliquely, with a row of straight outstanding hairs or spinules and an apical bent nail- 

 like spine. 



Pleopods. — Coupling spines with two pairs of lateral teeth below the apical ; arms 

 of the cleft spine very slender, that with the subapical dilatation the longer ; joints of 

 the rami six or seven in number. 



Uropods. — The first pair long and narrow, with a single minute tooth to the inner 

 margin, some way above the very narrow apex ; the rest of the ornamentation is 

 extremely minute, but there is some shallow serration of the lower part of the outer 

 margin ; the second pair shorter than the first, with the inner margin smooth except for 

 fine furring, the outer convex, with three little teeth, the apex acute ; the third pah- 

 shorter than the first, longer than the second, broader than either, yet not very broad, 

 having on the outer margin two small teeth and near the apex one very long one ; on 

 the inner margin there is one tooth, higher up than the long one of the outer margin ; 

 the finely pectinate apex is produced considerably beyond both. 



Telson small, not longer than the breadth at the base, rounded, but with a slight 

 apical narrowing. 



Length, three-twentieths of an inch. 



(ZOOL. CHALL. EXP. PART LXVII. — 1888.) Xxx 182 



