30 AXEL OHLIN, AKCTIC CKUSTACEA. 



Fam. Astacillidse.' 



{Arcfurida'.) 

 Arcturiis Latreille 1804. 



Arcturus hystrix (t. O. Sars. 



Fig. 6 a — r. 



1877. Arcturus hystrix G. O. Sars, Prodronius descr. Crust. etc. 1. c. 



1). 350. 

 1885. » > idem, Norske Xordhavsexp. p. 104, ]il. O, figg. 



23—26. 



Stat. 18. Lat. 74 .ö2' N., long. 17' 16' W., depth 350 in., muddy 

 clay, sand and pebbles, 4 VII, 1890, luany spec. 



Geographical distribution: Stat. 18, 124, 1(34 of the 

 Norwegian North- Atlantic Expedition all belonging to the 

 cold area; depth ranging from 350 to 457 fathoms. Also, it 

 was taken >in the water.s of the Polar Sea> on the »Valorous» 

 Expedition (Sars). 



Length of male 12 mm. 



» » female 10 » 



As there are no detailed figures of Arcturus hystrix, I 

 have thought it advisable to give such ones (figg. 6 a — r). 



Tribe Asellota. 



Fam. Janiridae. 



Jauira Leach, 1813. 

 Janthe Bovallius. 



Janira tricornis (KR0YER). 



1^46. Henopomus tricornis Kröyer, Voy. en Scand. etc. pl. 30, ligg. 



2 a — q. 

 1847. » » KryÖer, Karciu. Bidr. 1. c. R. 2, Bd. 2. 



p. 372. 



^ As statcd by Stebbing, Crustacea 1. c. p. 371, the name Astacilla was 

 already in the year 1795 proposed by (^ordixer for a species (probably A. longi- 

 vornis Sowerby) of this genus. Therefore, as that name is older than Leacia 

 JoHNSTON or Arcturus Latreille, the name of the family comprising these 

 crustaeeans ought to be changed to Astacillidce as Sars already has proposed. 



