Victorian Fresh-ivater Amphipoda. 229 



Maxillipedes. — These agree very closely with H. mihiwaka, 

 but the inner lobe compared with that species is short, only 

 reaching to the extremity of the inner distal angle of the first 

 joint of the palp. The inner margin of this lobe is straight, the 

 outer convex, the summit truncated and tipped with three short 

 stout teeth, which successively increase in size from the inner to 

 the outer sides; distally the inner margin has a row of plumose 

 setae which extend across the end and continue for a short 

 distance along the outer margin, also a few scattered ones near 

 the base of the teeth on the side that faces dorsally. The outer 

 lobe extends to half the length of the palp's second joint, its 

 inner margin is slightly convex, and fringed with a I'ow of fine 

 simple setae, the outer margin is deeply curved and free from 

 setae. The palp has the first joint tufted with a few short setae 

 on the outer distal angle, the second gradually widens distally, 

 due to the inner margin being laterally produced; this margin is 

 fringed with long fine setae, and the outer angle has a tuft of 

 setae; the distal margin is straight. The tliird joint has the 

 inner distal angle slightly produced, evenly rounded, and setose, 

 there is also a tuft of setae at the outer distal angle and also 

 another niedianly on the outer mai'gin. The last joint, which is 

 slightly embedded in the preceding joint, is short, broad at the 

 base, bluntly pointed, and bearing one stout seta at the apex, 

 and a few fine ones on the inner margin. 



Gnathopoda. — The coxal plate of the first gradually widens 

 distally, and the lateral angles are broadly rounded, that of the 

 second becomes gradually narrow distally. The margins of each 

 are entire and unclothed. 



Peraeopoda. — The coxal plate of the second is very wide, and 

 the hind margin is somewhat excavated. In the third pair the 

 coxa is bilobed, and the front margin of the hind lobe bears 

 about five rather long spines ; in the fourth pair the single-coxal 

 lobe is very deeply produced, and its posterior mai'gin spinose, 

 that of the fifth pair is small with margin unclothed. 



The branchial lamellae are rather small and narrow at the base. 



Uropods. — The first has the peduncle twice the length of the 

 rami, and the upper margin has only a few spinules, the rami are 

 short and subequal. The second has the inner ramus slightly 

 longer than the outer, and the whole of the upper surface thickly 



