22 CARL BOVALLIU6, AMPHIPODA HYPERIIDEA. I. 2. PARAPHRONIMID.E. 



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 first two pairs are rudimentary, neither tibia nor carpus 

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

 more slender development. 



The five following pairs are subequal, the third 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 pairs, and on the anterior margin of the last three pairs. 

 In the female the seventh pair are slenderer and shorter than the preceding pairs. 



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



The peduncles of the pleopoda 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 first pair are the longest, those of the last pair the shortest. The rami 

 are serrated. 



The telson is short, lanceolate. 



The fifth family PARAPHROMMIDiE, C. BOVALLIUS, 1887. 



Diagn. Caput permagnum, tumidum fere cubicum. Oculi magni, latera capitis occupantes. Antenna 

 primi paris recta;, parte anteriori capitis affixae, flagello tumido instructs : articulus primus 

 flagelli permagnus, articuli sequentes ininuti, perpauci, terminales. Antenna? secundi paris 

 compressrc, articulis paucis composite, parti inferiori capitis affixre; in femina rudimentariae. 

 Instruments oris lnasticatoria, mandibular palpo carentes. Pedes perm parium quinque 

 ultimorum ambulatorii, pedes septimi paris 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 antenna; 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 perceopoda are 

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



Syn. 1887. Parqphronimidce, C. BOVALLIUS. — "Systematical list of the Amphipoda Hy- 



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

 Bd. 11. N:o 16, p. 13. 

 » » Th. Stebbing. 1888. »B,eport on the Amphipoda». Voy. of 



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

 p. 1335. 



