Tribe 2. 



GAMMARIDEA. 



Henuivlcs. — This tribe compi'ises the ordinaiy or typical Amjihipoda 

 and constitutes by far the greater part of that order. Of course it must be 

 divided into numerous subordinate groups, which liowever, Ao not bear exactly 

 the same systematical relation to each other. Owing to the latter circi;mstance, 

 some of the later authors, for instance Boeck, only admit a very resti-icted 

 number of true families, whereas some of the latter, and especially the family 

 Gammayiihi', have been again divided into nuuierous sulj-families. As there, 

 however, is far from being full concord among the authoi's about the limits 

 of the several families and sub-families established, I think it will be at 

 present more suitable to avoid such a com])licated classification and to restrict 

 ourselves to a subdivisloi of the tribe into a number of families only, 

 remembering, howevei', that some of these families are rather nearly related, 

 while others are more sharply defined. 



Fam. 1. Orchestiidae. 



Body now rather tuirid, now more or less compressed, with the meta- 

 some and ui-oisome comparatively short and stout. Coxal plates rather large, 

 the 4th pair not emargiuated posteriorly, 5th pair deeply bilobed. Gephalon 

 truncated anteriorly and having the buccal mass greatly projecting inferiorly. 

 Eyes comparatively small and situated near the dorsal face of tlu^ cephalou. 

 Superior antenna generally very much shorter than the inferior and without 

 any accessory appendage. Inferior antennae more or less pediform, peduncle 

 rather elongated and having its basal joint coalesced with the cephalon. 

 Anterifir lip large, rounded; epistome applanated. Posterinr lip m(Mubi-inious, 

 with projecting lateral corners. Maudildes without palps, very powerful, cutting 

 edge divided into two superposed lamellae which are strongly denticulated on the 

 edges, molar expansion large and thick; between botli a series of curved setse. 



4 — Crustaco.'v. 



