42 CAUl, UOVAIJ.IIIS, AMIMliroDA II VPEKIIDEA. VIBILID^. 



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

 scarcely equallinii- iii lengtli half the pereion. The joints are sinooth. The dactylus 

 is ])i'()vid('d with soine very short spines at the eoncave margin. 



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

 (13:14); the tibia is shoi-ter than the carpus, the nietacarpiis longer than the carpus; 

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



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

 the segments are deep, rounded below. 



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



The iirus withont the telson is longer than the last pleonal segment. The second 

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



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

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

 the inner; the ]>eduncle 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 seiTated 

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

 teriör, serrated along both margins; the exteriör ramus is elongate-lanceolate, smooth 

 on the outer margin and finelv serrated alono- the inner. 



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

 ural segment. 



. The third family TIBILID^, CLAUS, 1872. 



Diagn. Caput parvum non tumidum. Oculi modici. Antennce primi paris rectae, parti anteriori capitis 

 affixre, flagello eoinpresso instructa;; articulus primus flagelli permagnus, articuli sequentes 

 minutissimi, perpauci, termiuales. Antennas secundi paris filiformes, ]iarti anteriori capitis 

 affixa;. Instrumenta oris masticatoria, mandibulse palpo instructa». Pedes pereii septimi 

 paris transformati. Pede>< uri ramis instructi. 

 The head is small, not tumid. Tiie 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. 

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

 are ada]ited for mastication; the mandibles are provided with a palp. The pereiopoda are 

 walking legs, the seventli pair are transformed. Tiie uropoda are provided with rami. 



Syn. 1840. Hypérims gammarovles, H. MILNE EDWARDS. — Histoire naturelie des Cru- 



stacés. Torne 3™", p. 72. 



1852. Siihfaviihj Vibiiime, D.\NA. United States Exploring Ex- 



pedition. Crustacea. Vol. 

 2, p. 980. 



1872. VibiUdtE, CLAUS. Grundzuge der Zoologie. 2te 



Aufl.. p. 236. 



