p^, 3 M3B-BCTm MMnEPATOPCKOM AKAAEMIM HAVKl. 1894. Nq 2 (OKTflBPb). 



/^SOXrc; ; ; ' 



(Bulletin de I'Academie Imp(^riale des Sciences de St.-Pt^tersbourg. 



1894. Octobre -^o 2.) 



Crustacea caspia. 



Contributions to the knowledge of the Carcinological Fauna 



of the Caspian Sea. 



By G. O. Sai-s, 



Professor of Zoology at the University of Christiaaia, Norway. 



Part III. 



.A. uvE :p lEi 1 1^ o r) ^^. 



l-st Article. f-nTCDP*T? 



IW\yrDTi:nn '■■Tr Gammaridse (part). iNVtR 1 tur-*- 



Wilh 8 autographic plates. \ Jl IJ' \. 



\ ZOOLOGY ^^ ^ 



« ^ (Lu lell mai 1894). 



Crustacea 



Crust?" 



INTRODUCTION. 



The Caspian Sea would seem truly to abound in Amphipoda. By tlie 

 investigations of Dr. Grimm and Mr. Warpachowsky, a rather extensive 

 material has now been brought together, the examination of which shows 

 indeed the Amphipodous Fauna of tliat isolated basin to be both rich and 

 diversified, comprising, as it does, numerous species belonging to several 

 distinct families. As yet known, the following families are represented in 

 the Caspian Sea: Lysianassidae, Pontoporciidae, Gammaridae, CoroiMidae. 

 The 2 last-named families are represented both in the collection of Mr. 

 Warpachowsky and that of Dr. Grimm, whereas only the latter col- 

 lection contains forms belonging to the 2 first ones. Of the above mentioned 

 4 families, the Lysianassidae and GoropMidac are, as well known, exclusively 

 marine in character, whereas the other 2 comprise, besides marine species, 

 also some apparently genuine fresh-water forms. By far the most abundantly 

 represented family is that of the Gammaridae, and of the genera com- 

 prised within it, the genus Gammarus has turned out contain much the 

 greater part of the species. Some of the Gammaroid genera occurring in the 

 Caspian Sea are very remarkable and rather uulike those represented in 

 the Oceans. Especially is the generic form named by Dr. Grimm Boeclda 

 liigldy distinguished by its most strange appearance. 



As is the case with the Mysidae and Gtimacea, much the greater part 

 of the Caspian Amphipoda are, as yet known, restricted in their occurrence 



$H3.-MaT. CTp. 179. 1 12* 



