CRUSTACEA CASPIA. 181 



been given of any of them. It is only some few points in their organisation 

 (especially the more or less development of the visual organs), which have 

 been treated of in detail, and this treatise is thus quite insufficient for re- 

 cognizing any of the species named. 



As, however, the collection of Dr. Grimm has kindly been placed in 

 my hands for examination, and some of the specimens contained in it are 

 labelled with the names given to them, I have been enabled to identify 

 several of the forms collected by Mr. Warpachowsky in the northern part 

 of the Caspian Sea with species detected at an earlier date by Dr. Grimm, 

 and I have endeavoured in every possible case to retain for the species the 

 names originally given to them by that distinguished naturalist, though in 

 some cases it has been necessary to make a slight change with the names, 

 partly because they have been preoccupied in Zoology, and partly because 

 they have been less correctly formed. It may be noticed that some of the 

 species named in his above-cited treatise (for instance Ganimarus Gregorkoivii, 

 G. coronifera, G. tliaumops) do not seem to be contained in the collection 

 sent to me, and that some others are only represented by apparently quite 

 immature specimens, which hardly suffice for i-ecogniziug the species. More- 

 over some of the specimens have been dried up at an earlier date by the 

 evaporation of the spirit, and on this cause deformed, so as to be only with 

 great difficulty examined. The greater part of tlie specimens are, however, 

 still in a very good state of preservation, and will suffice for a full examina- 

 tion of the species. 



The description of the new species contained in the collection of Dr. 

 Grimm must lie suspended for some time, as it has been destined, that the 

 results of the investigations of that naturalist sliould be published in a separate 

 work. It is therefore only the collection made by Mr. AVarpachowsky in 

 the northern part of the Caspian Sea, tliat will be the object of the present 

 treatise. I have however been authorized by the Academy to refer to the 

 collection of Dr. Grimm, as regards the horizontal and vertical distribution 

 of the species here described. 



The collection of Warpachowsky contains no less than 25 different 

 species, and as some of these species are very nearly allied, and moreover 

 the sexual dififerences often rather pronounced, it has appeared to me desir- 

 able, that each species should be described and figiu-ed in detail, and that 

 also good and sufficiently large habitus-figures should be given of both sexes. 

 On this cause it has been necessary to divide my treatise on that part of 

 the Fauna into several articles, each accompanied by 8 plates. The present 

 1st article will give full descriptions and figures of 7 species belonging to 

 4 different Gammaroid genera, viz., Bocckia, Gmelina, AmathiUina and 



^iHs.-MaT. CTp. 181, 3 



