126 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HTPERIIDjE. 



Euiulopis mirabilis. 



The eyes occupy the whole sui"face of the head, forming a distinct right and left 

 eye, separated by a very narrow strip along the top of the head. The ocelli are cora- 

 paratively smaller and more numerous than in Euitdopis Lovéni; the hair-covering is re- 

 duced to minute hairs on the upper parts of the head. 



The first pair of antennce (Pl. VIII, iig. 21) in the adult male are as long as the 

 second pair. The first joint of the peduncle is thick, almost globular, a third longer than 

 the two following joints together; the second peduncular joint is three tin)es more broad or 

 thick than long and a little longer than the third joint. The first joint of the flagellum is 

 longer than the whole peduncle, thick at the base, tumid, rapidly tapering towards the apex; 

 the inner and under sides are richly provided with simple, olfactory bristles. The second 

 flagellar joint is more broad than long; the third is more long than broad; the following 

 joints are elongated, increasing in length from the fourth joint, which is four times as 

 long as broad, to the last one, which is tapering, nine times as long as broad. The joints 

 of the flagellum are in all twenty-one in number. 



The second pair of antennas (Pl. VIII, fig. 22) are fixed just at the angle between 

 the front and the under side of the head. The first distinct joint of the peduncle is as long 

 as broad; the second joint is more broad than long, the third or last peduncular joint is 

 longer, tapering, a little tumid. The first joint of the flagellum is broad at the base, 

 the following joints are almost equal in length, cylindrical, six to seven times as long as 

 broad. The joints of the flagellum are twenty in number. 



The mouth-organs are like those in the preceding species. 



The p)erceon (Pl. VIII, fig. 20) shows those peculiar elevations on the segments, 

 mentioned above in Euiulopis Lovéni, but here the anterior parts of the second to sixth 

 segments, and the whole seventh segment are elevated; the hinder, depressed parts of 

 the second to sixth segments are about equal in length, each much shorter than half the 

 segment. The first segment is very short, not equalling in length a third of the second one. 

 The sixth segment is the longest of all. The hair-covering on the segments is very dense, 

 but consists of minute hairs; the hairs on the depressed parts of the segments are not 

 shorter than those on the elevations or rolls. These rolls are higher than those in the 

 male of E. Lovéni, but not as sti-ongly rounded as those in the female of the same spe- 

 cies. Behiiid the elevated part of the seventh segment there is to be seen a very short 

 depressed part. 



The epimerals ai'e a little longer than the under margins of the corresponding 

 segments. The epimeral of the first pair is the shortest, about as long as deep; the 

 others are more long than deep, with evenly rounded corners. 



The hranchial säcks are fixed to the second to sixth pairs of peraäopoda, they are 

 ovate, shorter than the femora of the corresponding pairs. 



The frst pair of perceojjoda (Pl. VIII, fig. 23) are smaller and shorter than the 

 second pair. The fem ur is not three times as long as broad, equalling in length the 

 three following joints together; the front margin is curved at the apex, showing the usual 

 narrow groove; the hind margin is straight. The genu is as long as broad, much shorter 

 than the tibia. The tibia is more long than broad; the hinder lower corner is not pro- 

 duced, rounded and armed with two bristles. The carpus is comparatively narrow, very 



