iyiy researches on the rehitions of the different forms of Amphipoda 

 Hyperiidea to one another and to the other Amphipoda have induced me 

 to establish a new tribe of Amphipoda, intermediate between the Gam- 

 maridea and the Hyperiidea. I propose to name it Amphipoda Syno- 

 pidea. In my opinion the Amphipoda thus ought to be divided into 

 five tribes, with the following diagnoses: 



1. Amphipoda Tanaideji. 



Caput cum segmento prinio pereii coalitum. 



Ocidi minuti in lobis discretis siti, vel niiUi. 



Antennm superiores flagello secimdario iustructse vel destitutae. 



Pedes maxillares in unnm coaliti, palpnm qnattuor-articulatum gercntes. 



Lamina' braiirJn'ales pedibus maxillaribiis affixse. 



Pleon saepe quiuque-articulatum. 



U^^iis maximum. 



Telson nullum, 



II. Amphipoda Gammaridea. 



Caput cum segmento primo pereii nou coalitum. 



OcuU mediocres, sessilcs. 



Afitemirp superiores tlagello secundario ssepissime instructae. 



Pedes maxilla7'es non coaliti, palpnm qnattuor-articulatum gerentes. 



Vesiculce hrnncliialcs pcdilms pereii aflfixae. 



Pleon tri-articulatum. 



Urus mediocre, tri-articulatnm. 



Telson saepissime fissnm. 



III. Amphipoda Syiiopidea. 



Caput cum segmento primo pereii non coalitum. 

 Ocidi grandes, maximam partem capitis occnpantes, sessiles. 

 Aiitennce superiores flagello secundario instrncttxi, 



Pedes moxillares plus minus ve coaliti, palpnm qnattuor-articulatum gerentes. 

 Nova Acta Reg. Soc. Sc. Ups. Ser. III. 1 



