22 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PAKAPHRONIMID^. 



is shorter than the carpus, and about the same breadth, with its distal extremity slightly 

 produced on either side of the dactylus to an acute point, which is almost as long as the 

 short dactylus. This arrangement probably compensates for the lack of the subchelate 

 development of the carpus. 



In the young animal the tirst tAvo pairs are rudimentary, neither tibia nor carpus 

 produced or dilated; thej^ are readily distinguished from the following pereiopoda by their 

 more slender development. 



The jive following pairs are subequal, the thivd and fourth pairs directed forward, 

 with the last two joints flexed backward; the last three pairs directed backward with the 

 last two joints flexed forward, a few short hairs are set equidistant along the posterior 

 margin of the third and fourth ])airs, and on the anterior margin of the last three pairs. 

 In the female the seventh i)air are slenderer and shorter than the preceding pairs. 



The pleon is narrower in the female than in the male. 



The peduncles of the pleopodn are broadly elliptical in the male, decreasing in size 

 posteriorly; in the female the are ovate. 



The third pair of uropoda are the longest, the preceding pairs are nearly subequal. 

 The rami of the iirst pair are the longest, those of the last pair the shortest. The rami 

 are serrated. 



The telson is short, lanceolate. 



The iifth family PARAPHRONIMID^, G. BOVALLIUS, 1887. 



Diagli. Cajjtit permagnum, tuniidum fere cubicum. Omli magni, latera capitis occupantes. Åntennce 

 prinii paris rectje, parte anteriori capitis affixs, flagello tumido instructas: articulus primus 

 flagelli permagnus, articuli sequentes minuti, perpauci, terminales. Antennfe secundi paris 

 compressa;, articulis paucis composit», parti inferiori capitis affixss; in femina rudimentarife. 

 Instrumenta oris masticatoria, mandibula; palpo carentes. Pedes pefcei parium quinque 

 ultimorum ambulatorii, pedes septimi pai-is non transformati. Pedes uri ramis instructi. 



The head is very large, tumid, almost cubical. The eyes are large, occupying the sides of 

 the head. The first pair of åntennce are straight, fixed at the anterior side of the head, 

 provided with a tumid flagellum ; the first joint of the flagellum is very large, the following 

 are minute, very few in number, terminal. The second pair are compressed, few-jointed, 

 fixed at the inferior side of the head, rudimentary in the female. The mouth organs are 

 adapted for mastication, the mandibles without palp. The last five pairs of perteojyoda are 

 walking legs, the seventh pair are not transformed. The wropoda are provided with rami. 



Syn. 1887. Paraphronimidce, C. BOVALLIUS. — »Systematical list of the AmpWpoda Hy- 



periidea». Bih. t. K. Sv. Vet. Ak. Haudl. 

 Bd. 11. ]S':o 16, p. 13. 

 » » Th. Stebbing. 1888. »Report on the Amphipoda». Voy. of 



H. M. S. Challenger. Zoology. Vol. 29, 

 p. 1335. 



