KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 215 



Syn. 1888. Ht/peria promontorii, TH. STEBBING. — - »Report on the Ampliipodii». Voy. 



of H. M. S. Cliallenger. Zoology. 

 Vol. 29, p. 1385, pl. IGO, 15. 



Of Hyperia ])roinontorii I have cxaniined inany specimeiis, and 1 thiiik tliat it i.s a 

 good species. It is distinguished from its nearest relatives by the followiiig characteristics: 

 from both Hyperia Fahrei and H. luzoni by the much dilated and tolerably produced 

 carpus of the first pair of perteopoda; from H. Fahrei by the femur of the fifth pair not 

 being broader than that of the seventh, and from H. luzoni by the telson being shorter 

 than half the peduncle of the last pair of uropoda. As Stebbing does not give any figure 

 of the whole animal, aiid no details of the female, I give some on plate XI. 



The mal e. 



The body is tolerably broad. The liead and pertton together are scarcely longer 

 than the pleon. 



The liead is quite as long as the lirst four pei'iBonal segments and half the fifth. 

 The antennal groove commences just at the middle of the front side, and is about as 

 high as broad. The head is not fully twice as deep as long, and has the under side 

 evenly roundcd. 



The first 2^air of antennce reach a little farther back than to the hind margin of 

 the second pleonal segment. The first joint of the peduncle is very broad, broader than 

 long, and not fully twice as long as the two following joints together; the second joint is 

 only a little longer than the third. The first joint of the flagellum is longer than the 

 whole peduncle, showing a short cylindrical projection from the lower distal corner just 

 as in Hyperia Fabrei; the second joint has two such projections, one in the middle of 

 the under margin and the other at the distal corner, and is about as long as a fourth 

 of the first joint; the third joint is as long as the second, but much narrower, and cylin- 

 drical; the following joints are slender, cylindrical, and slowly increasing in length to the 

 fourteenth, which is more than twelve times as long as broad. The flagellar joints are in 

 all eighteen in number. 



The second pair of antennas are a little longer than the first, and reach about to 

 the hind margin of the last pleonal segment. The first free joint of the peduncle is some- 

 what broader than long; the glandular cone is very large, nearly as long as the first 

 peduncular joint; the second joint is a little shorter than the first; the third is about twice 

 as long as the second. The first joint of the flagellum is fully as long as the last pe- 

 duncular joint, and much raore slender; the following joints are about equal in length, 

 slender, cylindrical, and about ten times as long as broad. The flagellar joints are in 

 all twenty-two in number. 



The lahrum is longer than broad, and slightly bilobed. 



The mandibles are stout, with the molar tubercle very broad. The three joints of 

 the mandibulav palp are almost equal in length. 



