Canon A. M. Norman on British Isopoda. 447 



This would seem to be a southern species. In my collec- 

 tion are co-types from Torbay (xS^e^Ji??^), specimens collected 

 at Exmouth (C. Parker), and others taken by myself at 

 Ilfracombe^ Plymouth, and Naples. 



Genus 3. Astacilla, Cordiner, 1795. 

 = Leucia, Johnston, 1825. 



1. Astacilla longicornis (Sowerby). 



1867. Arcturus longicornis, Bate & Westwood, I. c. vol. ii. p. 365, 2 • 

 1867. Arcturus gracilis (Goodsir), Bate & Westwood, /. c. vol. ii. 



p. 373, cJ. 

 1897. Astacilla longicornis^ G. O. Sars, I. c. p. 88, pi. xxxvi. 



Inhabiting all our coasts, Shetland, the Minch, Forth of 

 Clyde, Firth of Forth, Northumberland coast, South Devon, 

 Guernsey, Valentia, Ireland ; also Trondhjem Fiord and 

 Troraso, Norway : all in Mus. Nor. 



2. Astacilla interr^iedia (H. Goodsir). 



1841. Leachia intermedia, H. D. S. Goodsir, Edinb. New PbU. Joiiru. 



vol. xxxi. p. 309, pi. vi. figs. 1-3. 

 1867. Arcturus intermedius, Bate & Westwood, /. c. vol. ii. p. 371. 

 1869. Arcturus affinis, G. 0. Sars, " Nye Dybvandscrustaceer fra 



Lofoten," Christ. Viden. Selsk. Forhandl. p. 163. 

 1897. Astacilla affinis, G. 0. Sars, I. c. p. 90, pi. xxxvii. fig. 2. 



Notwithstanding some discrepancies in the description, I 

 think that there can be little doubt that Sars^s species, which 

 I obtained also in our seas and in Goodsir's locality, is that 

 which was named by H. Goodsir. That author describes 

 and figures the last joint of the antennte "globose'^ or, 

 according to the figure, claviform ; this appearance may have 

 been caused by the olfactory filaments clinging to the joints 

 and appearing as part of it. 



Exanjples in my collection are from the following sources: — 

 Firth of Forth, i. e. Goodsir's locality for his species {Dr. 

 Henderson) ; Durham coast (^A. J\[. iV.) ; off S.W. Ireland, 

 100-200 fathoms (' Porcupine,' 1869) ; off Fair Island, 

 between Orkney and Shetland (Dr. Thos. Scott) ; Norway 

 (co-typesof -4. o^n/s from G. O. Sars); Tromso {Schneider). 



3. Astacilla Deshayesii (Lucas). 



1849. Arcturus Deshayesii, Lucas, Anim, Artie, de I'AlgSrie, p. 69 

 pi. V. fig. 7. 



1874. Arcttirus gracilis, Stebbing (nee Goodsir), " Sessile-eyed Crus- 

 tacea of Devon," Trans. Devon. Assoc. Advanc. Science, p. 8, figs. 2-4 

 (separate copy). 



1878. Arcturus linearis, Stebbing, "Notes on Sessile-eyed Crustacea," 

 Ann. & Mag. Nat. Hist. ser. 6, vol. i. p. 30. 



