28 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PARAPHRONIMID^. 



Paraphroniina gracilis bas the body riiore slencler, and tbe legs comparatively 

 loiiger and narrowcr tban the two following species, the bead is longer and deeper, the 

 peduncles of tbe yropoda are also a little niore elongated. From P. pedestris it differs 

 cbiefly by the large bead and tbe compai-atively sbort carpi of tbe last five pairs of pertuo- 

 poda. The male is stouter than tbe female. 



Tbe integument of tbe body is very tbin, byaline, without ridges oi- impressions. 



Tbe head is almost cubical with rounded corners; at tbe anterior side there is a 

 shallow groove where the iirst pair of antennas are fixed. Tbe under-side is evenly con- 

 cavated. From a lateral view the vinder-margin is almost straight. Tbe head is fully 

 twice as deep as the first pera;onal segment and in tbe male as long as, in tbe female a 

 little longer than the first four perasonal segments. 



The et/es consist of larger and more distant ooelli than in tbe preceding families. 

 The ocelli ai-e divided into two distinct agglomerations on each side of tbe bead, one 

 much larger in the middle, and one small near tbe under-side. 



Tbe Ji7'St pair of antennce (Pl. II, fig. 2) are straight, much longer and stouter in 

 the male tban in the female. In tbe male tliey are almost as long as the head, in the 

 female they equal about a tbird of the length of tbe head. Tbe first joint of the peduncle 

 is longer than the two following togetber, tbe second is longer tban the tbird. Tbe first 

 joint of the flagellura reminds in sbape of tbat joint in the genus Vibilia, in the male it 

 is elongate-lanceolate, about four times longer than the peduncle; in the female tbe first 

 joint is scarcely twice as long as the peduncle. The inner-side of this joint is richly 

 fringed with long hairs and stout olfactory bristles. Tbe second and third joints of tbe 

 flagellum are usually distinct, hut very minute, tbe second longer tban the third. 



The second pair of antennce, (Pl. II, fig. 3) are fixed closely in front of the moutb- 

 organs at tbe bind corner of the under-side of the head. They consist in the male of 

 five joints, the first joint is very sbort, coalesced with the head, and pi"otuding as a round 

 tubercle, at tbe side of it is a large, circular opening for the gland contained in this joint, 

 the second joint is nearly as long as the bead, fr"inged with sbort, club-like, glandular hairs; 

 when at rest this joint is concealed in tbe above-mentioned groove at tbe under-side af 

 tbe head. The third and fourth joints are sbort, equal in length, the fifth is about twice 

 as long as the two preceding joints togetber, much narrower, linear, fringed with hairs. 

 The articulation between the second and third joint permits tbe terminal part of the 

 antennis (the flagellum?) to be folded up along the under-side of tbe long second joint. 

 In tbe female the second pair of antennas consist of only two joints, the basal one sbort, 

 tbe terminal five times longer, tapering, carrying a bristle at the apex. 



The mouth-organs will be described below, under Paraphronima clypeata, they offer 

 no difterences in the three species. 



Tbe perceon is more convex in the female tban in the male. Tbe first and second 

 segments are tbe shortest, the seventh tbe longest. 



Tbe epimerals are not separated from tbe segments, but are represented by the 

 abruptly narrowing lo\ver end of each segment. At the inner side of this narrow projection 

 articulates the femur of the corresponding leg. 



