Amphipoda Synopidea. 3 



dedly to tlio Hyperids, as the structure and developineut uf the eyes, 

 the structure of the mouth-organs (with tlie exception of the palps of 

 the maxillipeds), the form of the uropoda and the telson (especially in 

 the last two families) a. o. 



Probably the new genus Hi/periojm.^^ lately described by G. 0. 

 Sars'), is to be placed in this tribe as the type of a new family, Hy- 

 pe ri op si da3, and T shall preliminarily do so here, although I do not 

 know much about the very important characteristics of the mouth-or- 

 gans, because Saks only mentions, that the mandibles are provided with 

 palps, similar to those of the Gammarids. 



Thus the tribe can conveniently be divided into three families: 



1. SYNOPID^. 2. TRISCHIZOSTOMATID^ and 3. HYPERIOPSID^.. 



bifid. Synopidaj. 



The seventh pair of pereiopoda 



not transformed. Telson 



simple. T r i s c h i z s 1 ni a t i d ae. 



transformed. 'I'elson simple. Hy periopsidie. 



The first family. 

 SYNOPIDiE. 



Syn. 1852. Subfamily Synopincp. DANA. United States Exploring Expedi- 



tion. Crustacea, vol. 2, p. 981. Eol. 

 1862. Subfamily <Si/iio] nudes. SPENCE BATE. Catalogue of the specimens of Am- 



phipodous Crustacea in the col- 

 lection of the British Museum, 

 p. 341. 

 1880. Subfamily Synopiada;. R. KOSSMANN. Zoologische Ergebnisse einer im 



Auftrage der k. Academic der Wis- 

 senschaften zu Berlin ausgefiihr- 

 ten lleise in die Kiistengcbiete des 

 Rothen Meeres. Maiacostraca. p. 

 137. Leipzig. 4:to. 

 Diagn. The head is triangular, not tumid. 



The eyes occupy the upj)er median part of the head, and are distinctly faceted. 

 The mandibles are well developed, wiUi a three-jointed palp. 



1) The Norwegian North Atlantic Expedition. Zoology. Crustacea. I, p. 231. Chri- 

 stiania. 1885. Fol. 



