42 CARL BOVALLIUS, AMPHlrODA HYPERIIDEA. VIBILIBiE. 



The sixth pair are very short, a little shorter than the fourth pair (15:16), and 

 scarcely equalling in length half the pereion. The joints are smooth. The dactylus 

 is provided with some very short spines at the concave margin. 



The seventh pair (PI. VI, fig. 20 and 21) are only a little shorter than the fifth 

 (13:14); the tibia is shorter than the carpus, the metacarpus longer than the carpus; 

 the dactylus is beset with a few very short spines at the concave margin. 



The pleon is as long as the last three pereional segments. The lateral parts of 

 the segments are deep, rounded below. 



The pleopoda (PI. VI, fig. 22) with the rami 13-jointed. 



The urus without the telson is longer than the last pleonal segment. The second 

 and third segments are coalesced into one, as long as the first. 



The uropoda (PI. VI, fig. 23) are broad and short; the peduncles of the first and 

 third pairs are smooth along the outer margins, provided with some few long hairs along 

 the inner; the peduncle of the second pair is finely serrated at the outer margin, beset 

 with hairs along the inner; the peduncle of the third pair is longer than the last ural 

 segment. The rami of the first two pairs are elongate-lanceolate, acute, finely serrated 

 along both margins. The interior ramus of the third pair is much broader than the ex- 

 terior, serrated along both margins; the exterior ramus is elongate-lanceolate, smooth 

 on the outer margin and finely serrated along the inner. 



The telson is tongue-shaped, the margins smooth; it is about as long as the last 

 ural segment. 



The third family YIBILIDiE, CLAUS, 1872. 



Diagil. Caput parvum non tumidum. Oculi modici. Antennae primi paris recta?, parti anteriori capitis 

 afnxse, flagello compresso instruct*; articulus primus flagelli permagnus, articuli sequentes 

 minutissimi, perpauci, terminales. Antenna? seeuudi paris filiformes, parti anteriori capitis 

 affixa?. Instrumenta oris masticatoria, mandibular palpo instruct*. Pedes pereii septimi 

 paris transformati. Pedes uri ramis instruct!. 

 The head is small, not tumid. The. eyes are middle-sized. The first pair of antennce are 

 straight, fixed at the anterior side of the head, provided with a compressed flagellum; the 

 first joint of the flagellum is very large, the following very minute, few in number, terminal. 

 The second pair are filiform, fixed at the anterior side of the head. The mouth-organs 

 are adapted for mastication; the mandibles are provided with a palp. The pereiopoda are 

 walking legs, the seventh pair are transformed. The uropoda are provided with rami. 



Syn. 1840. Hyperines gammaroides, H.MILNE EDWARDS. Histoire naturelle des Cru- 



stacea. Tome 3 me , p. 72. 



1852. Subfamily Vibilince, DANA. United States Exploring Ex- 



pedition. Crustacea. Vol. 

 2, p. 980. 



1872. VibilidcB, CLAUS. Grundziige der Zoologie. 2te 



Aufl.. p. 236. 



