KONGL. SV. VET. AKADEMIENS HANULINGAK. BAND. 22. N:() 7. 109 



Offenbar ist die Verwandluiig der Hyperien als uint; ciiMvorbciu', iiicht als eirie 

 ererbtc zu bctrachten, d. h. das späte Auftretcn der Hiiiterlcibsaiihiiiigc utid die eigen- 

 thiiiulichc Fussbildung dei* Juiigeii sitid nieht mit der geschichtlichcn Entwicklung der 

 Amphipodeii in Verbindung zu bringeii, sondern auf Rechnung des Sehmarotzerleberis 

 der Jungen zu setzen.» 



Tliese iuterestitig stateuients of Fmrz Muller will bo diseussed in the niorpholog- 

 ical part of this treatise. Here follows tiie description of the uiale; the only speeimen 

 in the collection of »Musée dHistoire Natui-elle de Paris» being a male, I have not seen 

 any female speeimen. 



The body is longer and more slender than in Hyperocht Luetkeni, and the integu- 

 ment thinner and softer. 



The head is as long as the first two personal segments together, and somewhat 

 more broad than long. The antennal groove conimences above the middle of the front 

 side of the head and reaches to the lower margin. The head is not twice as deep 

 as long. 



The eyes occupy the whole sui'face of the head. 



The first pair of antennce are fully as long as the second pair. The first joint of 

 the peduncle is very large, more long than broad, and almost twice as long as the two 

 foUowing joints together; the second joint is shorter than the thii"d. The tirst joint of 

 the flagellum is nearly as long as the head, and rauch longer than the whole peduncle, 

 thick, almost cylindrical, as broad at the apex as at the base, the inner side is richly provided 

 witli long hairs. The second flagellar joint is short, equalling about a ninth of the length 

 of the iirst joint, but much thicker than the following joints, which are eighteen to tAventy 

 in number; each joint is five to six times as long as broad. 



The second pair of antenme. The iirst free joint of the peduncle is shoi"t and stout, 

 as long as the second, the last joint is almost as long as the two preceding ones together. 

 The flagellar joints are equal in length, about ten times as long as broad; they are 

 twelve in number. 



The pierceon. The first and second segments are equal in length; the seventh seg- 

 ment is the largest of all. 



The ejnmerals of the first four pai)-s are somewhat shorter than the under margins 

 of the corres])onding segments, those of the last three pairs are as long as the segments. 



The branchial säcks are fixed to the second to sixth pairs of pera^opoda. They are 

 considerably shorter than the corresponding femora. 



The first pair of perceopoda. (Pl. VII, fig. 28). The fem ur is elongate, fully three 

 times as long as broad, the front and hind margins are feebly curved. The genu is 

 smooth, as long as broad. The lower hinder corner of the tibia is produced, but the 

 S])oon-shaped process does not reach farther than to the middle of the stem of the carpus, 

 it is tipped with minute hairs. The front margin of the carpus is feebly curved, the 

 hind margin is a little excavated. The carpal process is shorter than the rest of the carpus; 

 the hind margin is smooth, the front margin forms a knife-like, strongly serrated, edge, 

 Jike that described in Hyperoche Luetkeni, the sei-ration is composed of thirty-four to 



