262 CARL BOVALLIUS, AMPHIPODA HYPP^EIIDEA. I. 2. HYPERIIDiU. 



Paratkcmisto japonica. 



notched, and provided with a few short bvistles. The metacarpus is long, slender, quite 

 as long as the two preceding joints together; in the sixth pair it is a little longer; the front 

 margin is somewhat concave, it is finely pectinated, and provided with bristles; the hind 

 margin is set with short bristles. The dactylus is long and slender; in the sixth pair 

 it is nearly a third part as long as the metacarpus; in the fifth pair it is serrated at 

 the base on the front margin, while it is smooth in the sixth and seventh pairs (Pl. XII, 

 fig. 38 and 41). 



The yleon is longer than the last tive peraBonal segments together. The lateral 

 parts of the segments are obtusely rounded behind. 



The pleopoda have the rami long and slender. In the first pair each i"amus has 

 ■fifteen joints. The coupling spines are hook-shaped, with two sharp teeth on the side 

 of the stem; the cleft bristle has the apically dilated arm a little shorter than the other. 



The urufi. The iirst segment is about as long as the last coalesced, which is twice 

 as broad as long. 



The uropoda (Pl. XII, fig. 43). The first pair reach heyond the raiddle of the outer 

 ramus of the last pair; the peduncle is linear, four times as long as broad, and quite as 

 long as the inner ramus, which is a third part longer than the outer; both rami are 

 elongated, and sharp-pointed; the inner is serrated on the outer margin; the outer ramus 

 is serrated on the inner margin. The second pair reach a little beyond the apex of the 

 peduncle of the last pair; the peduncle is narrower at the base than at the apex, with 

 the lower inner corner strongly produced downwards; the inner ramus is a little shorter 

 than the peduncle, and is longer than the outer ramus; it is irregularly lanceolate and 

 serrated on both margins; the outer ramus is much nari'Ower than the inner, is sharp- 

 pointed, and serrated along the inner margin. The peduncle of the third pair is linear, 

 three times as long as broad, and has the lower inner corner produced as in the second 

 pair; the rami are equal in length, and as long as two-thirds of the peduncle; the inner 

 is broader than the outer, and is serrated on both margins; the outer ramus is serrated 

 on the inner margin. 



The telsoti is as long as broad, fully as long as the last ural segment, and more 

 than a third part as long as the peduncle of the last pair of uropoda. 



The female. 



Fl. XII, fig. 17—21, 39 aud 40. 



The forepart of the bodij is wider than in the male; the pleon and urus together 

 are shorter than the perason. 



The first pair of antennce (Pl. XII, fig. 18 and 19) are somewhat longer than the 

 head and the first perteonal segment together. The first joint of the peduncle is more 

 than twice as long as the two following joints together. The single flagellar joint is con- 

 siderably more than twice as long as the whole peduncle; the basal portion is conical, with 

 somewhat bulging sides, the under margin is serrated, and provided with long olfactory 

 hairs (Pl. XII, fig. 19); the flagellum is slender, cylindrical, and entirely smooth for the 

 last two thirds of its length. 



