CRUSTACEA MALACOSTRACA. IV. 



36, 1435 fath. But three other places, which have rather moderate depths and yielded lower numbers of Ta- 

 naidacea and Isopoda than the deeper stations just enumerated, gave the richest harvest of Cumacea. The 

 places in question are: "Ingolf" Stat. 32, 318 fath. (temp. 3.9 ), with 12 species; the "Thor" at Lat. 6i°07' N., 

 Long. 9°30' W., 443 fath., with 13 species, and at Lat. 61 15 X.. Long. g°35' W., 463 — 515 fath., with even 

 15 species, thus only a little less than one-fourth of the total number of species in the area. 



As only rather few species of Cumacea are restricted to depths from a few and down to 50 — 60 fa- 

 thoms, the majority live most frequently or always in considerable depths, while only 15 species (2 among 

 them only taken by the "Valorous") have been found in depths from 1000 to 1870 fathoms, and only 10 of 

 these are known exclusively from these depths; 8 of these 10 species are new to science. 



Of Tanaidacea the "Thor" secured only a few species, of Isopoda scarcely 2 /- of all species known from 

 the area, but of Cumacea 33 species, half of the whole number known from our area, while the "Ingolf" had 

 only somewhat more, viz. 41 species. The geographical and bathymetrical distribution of the species of Cu- 

 macea helps somewhat to understand that remarkable fact. Many of the "Ingolf" stations are in the cold area, 

 which has a very poor fauna of this order. Furthermore stations with the depth exceeding 600 fathoms yielded , 

 with a single exception, a comparatively considerably or much lower number of Cumacea than of Tanaida- 

 cea and Isopoda. The highest number of species was taken both by the "Ingolf" and the "Thor" at places 

 with depths between 300 and 600 fathoms; finally the bottom of the two above-named places, where the 

 "Thor" gathered the very high number of Cumacea, must be especially fit for animals of this order. 



Family Bodotriidae. 



Of this rich family, which is widely distributed in warmer temperate and in tropical seas, only two 

 genera have been found in the "Ingolf" area. 



CydaSpiS G. O. Sars. 

 The single European species of this large genus occurs in the southern part of our area. 



1 Cyclaspis longicaudata G. O. Sars. 



1865. Cyclaspis longicaudata G O. Sars, Forh. Vid. Selsk. i Christiania for 1864, p. 207. 

 1896. Bonnier, Ann. Univ. Lyon, T. XXVI, p. 534. PL XXVIII, fig. 2a— 2v. 



11899. G. O. Sars, Account', III, p. 16, Pis. VII— VIII. 



1913. Stebbing, Das Tierreich, 39. Lief., p. 30. 



Bonnier has described and figured the sculpture on the carapace, but did not perceive that many of 

 the so-called "cellules" have at the middle a more or less elevated granule. — A feature, which seems to have 

 been overlooked by authors, is that in females and immature males (adult males are unknown to me) the 

 distal part of the upper margin of the peduncle of the uropods has 3 or 4 saw-teeth. 



