BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 26. AFD. IV. N:0 12; 35 



raiuus of the uropods is considerably longer and twice as 

 tliick as the outer ramus (in E. cornuta both rami are of 

 tlie same leiigth, and the inner ramns only a little thicker 

 than the outer). Male operculuni differing considerably from 

 that in E. cornuta, their lateral plates being distall}'' pro- 

 longed with the exteriör margins cnrved inwards. The 

 relative length of the lateral and median plates is also 

 very different. The former being here proportioually much 

 lonser than those of E. cornuta. Besides that. the median 

 plates are of another shape as shown in the figure 7 f. Also, 

 the female operculum is easily to be distinguished from that 

 in E. cornuta. It is nearly rhomboidal, and the highest point 

 of it, in a view »en profil», is situated very far backwards 

 and is sloping down very steep against the last part of the 

 middle line (in E. cornuta, the highest point is more or less 

 situated at the middle. 



In other respects it agrees with E. cornuta. Thus it is 

 provided with a pointed rostrum, and the structure of an- 

 tennffi, pereiopods, and oral parts is essentially the same as 

 in that species. 



This species seems to be a true deep sea-inhabitant. It 

 was dredged by me at the following stations: 



stat. 27. lat. 77' 52' X., long. ?/ o' W., 40' SW. of the »Swedish 

 depth», depth 2750 m., bottom terap. — 1,4 C, biloculina 

 clay, 29, VII 1898, fem- spec. 

 » 28. lat. 76 36' N., long. 12' 10' E., 50' W. of Horn Sound, 

 West Spitzbergen, depth 1750 m., bottom temp. — 1,3° C, 

 transition clay, 1 /VIII/1898, three spec. 



According to a kind communication from Dr. H. J. Han- 

 sen, this species was obtained during the Danish Ingolf Ex- 

 pedition at four stations, all belonging to the cold area. The 

 depths ranged from 750—1060 fathoms, and the bottom tem- 

 perature from — 0,8 C. to — 1 C. Eurycope cornuta does 

 not occur, according to Särs, in depths greater than 400 

 fathoms. 



Ilyarachna G. O. Särs 1863. 

 Mesostenus G. O. Särs (preoccupied). 



Ilyarachna hirticeps G. O. Särs. 



1870. Ilyarachna hirticeps, G. O. Sars, Nye Dybvands-Crustaceer fra 

 Lofoten Forh. Vid. Selskab. Christiania Aar 1869, p. 167. 



