CRUSTACEA MALACOSTRACA. III. 



Tatt, Eurydice Grimaldii Dollf. and E. coeca n. sp., Idothea metallica Bosc, the larval stages of Syscenus 

 infelix Harg. and of Epicaridea. The species of the sub-family ^Eginse are either living on fishes or 

 are found at the bottom, frequently in depths of several hundred fathoms, but probably the}- frequently 

 swim about looking for a host, while their ovigerous females take no food and live only on the bottom. 

 When speaking of bathymetrical distribution all these animals living either constantly pelagically or 

 during periods of their life as parasites may be put aside. 



Nearly all other Isopoda dealt with in the present paper are living during their whole life either 

 on or near the bottom. G. O. Sars has collected large numbers of specimens of the genera Eurycope, 

 Ilyarachna and Munnopsis; he has described their methods of walking and swimming, but according 

 to his statements one must conclude that they constantly live at or near the bottom. I do not know 

 a single instance of any species of these genera, excepting Eur. Murrayi Walk., having been taken in 

 any instrument not sunk to or very near to the bottom. It may be possible that some species of the 

 genera Desmosoma G. O. Sars and Nannoniscus G. O. Sars sometimes may raise from the bottom and 

 swim about, but judging from the fact that only a single specimen of these genera, viz. Dcsmosowa 

 clielatum Steph., has been recorded in the literature as taken pelagically — and even at a station 

 between Elba and Corsica, together with 3 species of Apseudes otherwise never before taken in this 

 way — this mode of living must be extremely exceptional, as both genera comprise numerous species. 

 And many Isopoda, f. instance the species of the Iscknomesus-giou'p, are certainly quite unable to swim. 



A restricted number of Isopoda live either near the shore [Icrrd) or in depths from very few to 

 50 or sometimes about a hundred fathoms (lanira tricomis Kr., some species of Munna, most species 

 of Idothea). lanira maculosa Leach is most remarkable, as it has been taken in most different depths, 

 from a few down to more than a thousand fathoms, and the specimens inhabiting rather low water 

 differ, as is shown later on, markedly from those captured in the deep sea. 



The great majority of the Isopoda from our area are bottom animals living in rather consider- 

 able or great depths. The two richest places are the two "Ingolf" stations 78 and 36, both in the 

 warm area. At Stat. 78, 799 fathoms, an enormous quantity of bottom material, especially sponges, 

 was hauled up, and 22 species of Isopoda were found; at Stat. 36, 1435 fathoms, the bottom material 

 did not fill a liter in a sifted condition, but it contained 18 bottom species, and two certainly bathy- 

 pelagic species were found in the meshes of the trawl. A number of bottom forms were also procured 

 at two other of the deepest stations in the warm area, viz. at Stat. 24, 1199 fathoms, 15 species, and 8 

 species at Stat. 38, 1870 fathoms. With very few exceptions the forms taken at these four stations 

 belong to the Asellota, and as to this sub-order we arrive at a similar result as that pointed out in 

 my report on the "Ingolf" Tanaidacea on the rich family Tauaidse, that the richest harvest was yielded 

 by some of the deepest stations south and west of southern Greenland. The only other rich places 

 are the above-named Stat. 78, 799 fathoms, far south-west of Iceland, and Stat. 25, 582 fathoms, in 

 Davis Strait, where 16 species, 12 among them Asellota, were gathered. At the three stations 24, 36 

 and 38, with depths from about 1200 to 1870 fathoms, together with Stat. 78, were taken in all 33 new 

 species of the Asellota. 



Of the total number of Isopoda only 17 species have been taken exclusively in temperatures 

 below zero, and 15 of these in at least 293 fathoms, and generally in greater depths, thus exclusively 



