446 Canon A. M. Norman on British Isopoda. 



tlie entire dorsal surface, but are present also on the peduncles 

 of tlie antennules, the epimera of the last three segments, 

 and tlie legs. They are especially conspicuous upon the 

 nietasome, where the individual granules, lying in one 

 direction (backwards), are more clearly separable than on 

 other parts of the body, and when viewed under the micro- 

 i^cope each is seen to bear a minute ciliurn. The epimera of 

 the last three segments are more widely rounded distally 

 than in var. tuherosus of the last species. The peduncles of 

 the antennules are not only covered with granules, but bear 

 setai which are more developed than is usual in forms of 

 A. haffini. Length 35 mm. This form is so markedly 

 distinct from A. haffini that it would certainly seem to be 

 a good species. I have seen several specimens which were 

 taken by Sir John Murray on H.M.S. 'Triton^ in 1882. 

 It was dredged in the cold area of tlic Faroe Channel, 

 Stat. 4, lat. 60° 22' N., long. 8° 2V W., in 327 to 430 fathoms 

 (Mus. Nor.). 



Arcturus hystrix, G. O. Sars. 



1876. Arcturus hystrix, G. O. Sars, /. c. p. 350. 



18S5. Arcturus hystrix, G. O. Sars, I. c. p. 104, pi. ix. figs. 23-26. 



1901. Arctunis hystrix, Oblin, " Arctic Crustacea, Leptostraca, 



Itopoda, Cumacea," K. Sveuska Vet.-Akad. Haudl. vol. xxvi. p. 30, 



pi. ii. fig. 6 a, pi. iii. figs. 6i-A:. 



' Porcupine,' 1869, Stat. 50, lat. 59° 54' N., long. 7° 52' W., 

 355 fathoms, and Stat. 59, lat. 60° 21' N., long. 5° 41' W., 

 580 fathoms. The first of these localities is just within the 

 ]5ritish Area, the second is in the cold area of the Faroe 

 Channel. 



Genus 2. Aecturella, G. O. Sars. 



1. Arctarclla dilatata, G. O. Sars. 



1882. Astacilla dilatata, G. 0. Sars, I. c. p. 63, pi. ii. fig. 3. 

 1897. Arcturella dilatata, G. O. Sars, /. c. p. 92, pi. xxxviii. 



My late friend Dr. D. Robertson found this many years 

 ago, as recorded by him in his ' Cat. Amphip. and Isop. of 

 the Clyde/ pt. 2, p. 28, in 20 fathoms off Black waterfoot, 

 Isle of Arran, and kindly sent me specimens. Dr. Thomas 

 Scott has given me examples from off Fair Isle, that is 

 between Slietland and Orkney, and from the Copenhagen 

 Museum I have received Danish specimens. 



2. Arcturella damnoniensis (Stebbing). 



1874. Arcturus damnoniensis, Stebbing, "A new Species of Ai-cturus," 

 Ann. & Mag. Nat. Hist. ser. 4, vol. xiii. pi. xv. 



