448 Canon A. M. Norman on British Isopoda. 



This species was added to the British fauna by Mr. 

 Stebbing, who at first referred it to -4. gracilis^ but subse- 

 quently renamed it Arcturus linearis, but in Hist. Crust. 1898, 

 ]). 371 , drops A. linearis and uses A. Deshayesii. The female 

 is easily recognized by the single tubercle on the front half of 

 the fourth segment of the niesosome. In the male there is 

 often a slight swelling of the integument in the same position, 

 but at other times the swelling is absent. Specimens in my 

 collection are from Torbay [Stebbing, co-types of his species), 

 Salcombe, Devon, and Plymouth [A. M. N.), west of 

 Gibraltar, and from tiie Adriatic {Prof. Claus). 



\_AstaciUa granulata, G. O. Sars. 



1876. Leachia granulata, G. O. Sars, /. c. p. 351. 



1878. Astacilla americana, Harger, Amer. Journ. Science & Arts, 

 ser. 3, vol. xv. p. 374. 



1879. Astacilla (/ranulata,'RaTgeT, Proc. U.S.Nat. Mus. vol. ii. p. 161. 



1880. Astacilla granulata, Harjrer, /. c. p. 361, pls.Tiii., ix. figs. 48-52. 

 1885. Astacilla granulata, G. 0. Sars, I. e. p. 107, pi ix. tigs. 27-35. 



This very pretty species, which looks as if it was clothed 

 with a garment thickly embroidered with pearls, was dredged 

 by the ' Lightning' Exped. of 1868, Stat. 3, lat. 60° 31' N., 

 long. 9° 18' W., in 229 fathoms ; and by the ' Porcupine ' 

 in 1869, Stat. 59, lat. 60° 21' N., long. 5° 41' W., in 580 

 fathoms : both these stations are to the north of the Britisii 

 Area. 



EXPLANATION OF THE PLATES. 

 Plate XII. 



Fiq. 1. ^ga Deshayesiana, H. Milne-Edwards. 



Fig. 2. Ditto. Head seen from below. 



Fig. 3. Ditto. Palp of mandible. 



Fig. 4. Ditto. Outer uropod. 



Fig. 5. jFga ventrosa, M. Sars. 



Fig. 6. Ditto. Head seen from below. 



Fig. 7. Ditto. Palp of mandible. 



Fig. 8. Ditto. Telson and uropods. 



Plate XIII. 

 Fig. 1. y3£ga megahps, Norman and Stebbing. 

 Fig. 2. Ditto. Head seen from below. 

 Fig. 3. Ditto. End of palp of mandible. 

 Fig. 4. Ditto. Maxillipeds. 

 Fig. 5. Ditto. First foot. 

 Fig. 6. Ditto. Last foot. 

 Fig. 7. Ditto, Telson and uropods. 

 Fig. 8. ^ga ventrosa, M. Sars. First foot. 

 Fig. 9. Ditto. Last foot. 



Fig. 10. .^ga Deshayesiana, II. Milne-Edwards. First foot. 

 Fig. 11. Ditto. Last foot. 



