18 



W. LlLLJEBORG, 



Dana j ) and Spence Bate 2 ), who give to this group a wider range, lay- 

 stress on the size of the epimera, (coxae, S. Bate), but this is no distin- 

 guishing feature, for there are others e. g. Stegocephalus , Pleustes, Odins 

 (Otits S. Bate) with equally large or larger epimera. Dana reckons up 

 as belonging to this under-family the genera: Lysianassa M. Edwards, 

 Phlias Guerin-Meneville , Opis Kroyer, Uristes Dana, Anonym Kroyer 

 and Urothoe Dana. From these we reject Phlias, Uristes and Urothoe, the 

 two first on the ground that they have no flagellum appendicular on the 

 upper antennae, and the last on that of its not having a thick shaft to the upper 

 antennae, and moreover that it nearly approaches the genus Phoocus Kroyer. 

 Spence Bate includes in the sub-family of Lysianassidae the genera Lysia- 

 nassa, Anonyx, Pontoporeia KROYER, Opis, Ichnopus CosTA, Callisoma COSTA, 

 Alibrotus M. Edwards, Hyale H. Rathke, Phlias and Uristes. Of these 

 we reject Pontoporeia on acconnt of the different form of the mandibulae, 

 and the genera Alibrotus and Hyale on account of the entirely different con- 

 struction of the upper antennae and second pair of feet. The genus Ich- 

 nopus appears to us identical with that of Lysianassa, and as regards Phlias 

 and Uristes we have already stated our opinion. We therefore include in 

 this sub-family only the genera Lysianassa, Anonyx, Callisoma and Opis, 

 to which we add the two new genera Eurytenes and Acidostoma. In order 

 to illustrate our view of the family Gammaridae and the underfamily Ly- 

 sianassina, we adduce here first a tableau of the families included in the 

 suborder Amphipoda, and next a similar tableau of the sub-families com- 

 prised in the family Gammaridae , and, as therewith connected, of the ge- 

 nera within the same family belonging to our-own fauna. We do this 

 the rather since no new synopsis of the kind has appeared since the year 

 1859, when Doctor Bruzelius in Kongl. Wetenskaps- Akademiens Hand- 

 lingar, (new series) Vol. 3, p. 1. published his excellent paper "Bidrag till 

 kannedom om Skandinaviens Amphipoda Gammaridea" (Contributions to the 

 knowledge of the Amphipoda Gammaridea of Scandinavia). Our knowledge 

 of these Crustacea has since that time received considerable additions from 

 the labours of Candidate A. Boeck, Professor M. Sars, and the observations 

 we have ourselves had the opportunity of making on the Western Coast of 

 Norway, and we can accordingly now include 36 genera as belonging to 

 our fauna, while Bruzelius has only 19. Of these genera 4 are new viz. 

 Eurytenes, Acidostoma, Tiron and Oediceropsis, of which genus Eurytenes 



') Explor. Exped. Crustacea. T. II. p. 908. 

 2 ) Catalogue etc. p. 64. 



