96 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPEUnDTIi;. 



form of the first two pairs of perasopoda, with the forine]- also the narrowness of the fe- 

 mora of the last three pairs and the almost linear carpi of the third and fonrth pairs. 



The original diagnosis of A. Boeck runs, as follows. 



»Pedes Imi paris articulo 3tio brevi, non ad basin calcis producto; manu ferme 

 duplo longiore qvam ad basin lata, in margine interiore serrata, calce carpi perlata, usque 

 ad finem manus porrecta, in margine interiore serrata; ungue parvo, non serrato. Pedes 

 2di paris ferme ut pedes Imi paris; sed articulo 3tio perbrevi; carpo angustiore; calce 

 ad finem ungvis porrecta; ungve in margine posteriore spinis instructo. Pedes 3tii et 

 4ti paris articulo 3tio longiore qvam apud speciem antecedentem'); articulo 4to longitudi- 

 nem dimidiam ai-ticuli 3tii a3quanti, non dilatato, angusto, qvater longiore qvam lato, 

 parum modo breviore qvam articulo Sto gracile. Pedes trium pariura ultimorum ungve 

 breviore qvam apud speciem antecedentem. Pedes saltatorii ultimi paris pedunculo ter 

 longiore qvam lato». 



In the charactei'istic »articulo 4to longitudinem dimidiam articuli 3tii a^qvanti», the 

 word »dimidiam» is evidently miswi-itten instead of yxJuplamn, it is, however, repeated in 

 the reprint of the diagnosis in 1872^), but there the wording of the Norwegian text is 

 right, stating that the third joint (= the tibia) is about half as long as the fourth. 



Boeck did not mention if he had examined specimens of both sexes of the spe- 

 cies, but judging from the drawings of the first pair of antennaä and of the second pair 

 of pera^opoda I am pretty sure that he has seen only the female. 



Here follows a traduction of the description given by Boeck in 1872 1. c, p. 83 

 and 84. 



The body is very compressed. 



The Jirst pair of perceopoda (tig. 3, p. 94) have the fe mur tolerably broad, the 

 front margin strongly convex; the tibia is produced into a process tipped with bristles, 

 this process does not reach to the base of the carpal process. The carpus is much 

 broader than the tibia, produced into a sharp-pointed process, serrated along the front 

 margin; this process is shorter than the metacarpus. The metacarpus is about as long 

 as the carpus, or a little shorter, but considerably narrower, and serrated along the hind 

 margin; it reaches about as far as to the apex of the carpal process. 



The second pair (fig. 4) are similar to the first pair, but the tibia is shorter, and 

 the carpal process is much longer, reaching almost to the apex of the outstretched 

 dactylus, it is thus much longer than the metacarpus. 



The third and fourth pairs have the tibia about half as long as the carpus; the 

 carpus is linear, somewhat shorter but broader than the metacarpus. 



The last three pairs have the same form; the fem ur is not dilated; the tibia is 

 about half as long as the carpus, or a little more than half as long. The carpus of the 

 fifth pair is serrated along the front ma.rgin, the lower anterior corner is a little produced, 



*) Metoecus medusarum = Hyperoche Kroeyeri. 

 -) De Skandinaviske og Ai-ktiske Amphipoder, p. 84. 



