443 Canon A. M. Norman on British Isopoda. 



This appears to be scarce on our coasts. I have it only 

 from the south-west of Ireland ; and some specimens given 

 me by Dr. Thos. Scott, which were found at Aberdeen. 



6. Idotea metallicaj Bosc. 



1802. Idotea metalUca, Bosc, Hist. Nat. des Crust, vol. ii. p. 179, 



pi. XV. fig. 6. 

 1846. Idotea rohusta, Kroyer, Naturliist. Tidssk. ser. 2, vol. ii. p. 108, 



"Voyage en Scand. &c. pi. xxvi. fig. 3. 

 1880. Idothea robusta, Harger, Rep. U.S. Commiss. Fisli and Fisheries, 



p. 349, pi. vi. figs. 30-32. 

 1895. Idotea metallica, Dollfus, I. c. p. 8, fig. 24. 



Among Crustacea from off S.W. Ireland which Professor 

 Haddon sent me to name some years ago was a single 

 specimen of this free-swimming plankton species. It is thus 

 added to the British fauna. It has a wide range over the 

 Atlantic, and occurs also in the Mediterranean Sea. Speci- 

 mens in my own collection are from Rhode Island and 

 Vineyard Sound (;S'. /. Smith), lat. 55° W N., long. 16° 

 44' W. (' Valorous,' 1876} ; Mediterranean (' Porcupine,' 

 1870). 



7. Idotea emarginata, Fabricius. 



1867. Idotea emarginata, Bate & Westwood, /. c. vol. ii. p. 28G. 



1895. Idotea emarginata, DuUfus, I. c. p. 6, tigs. 17, 18. 



1897. Idothea emarginata, G, 0. Sars. /. c. p. 85, pi. xxxv. fig. 2. 



This occurs apparently all round our coasts. My own 

 examples are from Skye, Whitby, Plymouth, and Ardbear 

 Ba}^, Ireland ; and I liave taken it at other places — for 

 example, the coasts of Durham and Northumberland. 



8. Idotea linearis (Pennant). 



1846. Idothea se.vli?ieata, Kroyer, Naturhist. Tidssk, ser. 2, vol. ii. 



p. 88, Voyage en Scand. &c. pi. xxvi. fig. 1. 

 1867. Idotea linearis, Bate & Westvrood, /. c. vol. ii. p. 888. 

 1895. Idotea linearis, Dollfus, I.e. p. 6, tig. 16. 



I have taken this species in the following localities : — 

 Durham coast, the Humber, Exmouth, Plymouth, Fal- 

 mouth, Guernsey, Jersey, and Cape Breton, Bay of Biscay; 

 I have also specimens from the Poach Piver, Essex 

 {^Dr. Baird), and Valencia, Spain [Don I'edro Antiga). 



Genus 2. Zenobiana, Stebbing, 1895. 

 = Zenobia, Risso. 



The nasne Zenohia had been twice used before Pisso 



