447 Canon A. M. Norman on British Isopoda. 



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

 tion are co-types from Torbay (Stebbing), specimens collected 

 at Exmoutli {C. Parker), and others taken by myself at 

 Ilfracombe, Plymouth, and Naples. 



Genus 3. Astacilla, Cordiner, 1795. 

 = Leacia, Johnston, 1825. 



1. Astacilla longicornis (Sowerby). 



1867. Arcturus longicornis, Bate & Westwood, I. c. vol. ii. p. 365, 5 • 

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



p. 373, c?. 

 1897. Astacilla lo7igicornis, 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 

 Tromso, Norway : all in Mus. Nor. 



2. Astacilla intermedia (H. Goodsii). 



1841. Leachia intermedia, H. D. S. Goodsir, Edinb. New Pliil. Joiirn. 



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

 1867. Arcttirus intermedins, Bate & Westwood, I. c. vol. ii. p. 371. 

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



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

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



Notwithstanding some discrepancies in the description, I 

 think that there can be little doubt that ISars'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, claviforra ; this appearance may have 

 been caused by the olfactory filaments clinging to the joints 

 and appearing as part of it. 



Examples in my collection are from the following sources: — 

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

 Henderson) ; Durham coast {A. M. N.) ; off S.W. Ireland, 

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

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

 (co-types of J^. affinis from G. O. Sars); Tromso {Schneider), 



3. Astacilla Deshayesii (Lucas). 



1849. Arcturus Deshayesii, Lucas, Anim. Artie, de FAIg^rie, p. 59, 

 pi. V. fig. 7. 



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

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

 (separate copy). 



1878. Arcturus /^nefi;vs, Stebbing, " Notes on Sessile-eyed Crustacea," 

 Ann. & Mag. Nat. Hist. ser. 6, vol. i. p. 36. 



