444 Canon A. M. Norman on British Isopoda. 



instituted liis genus. Stebbing supplied Zenohiana (Ann. 

 & Mag. Nat. Hist. ser. 6, vol. xv. 1895, p. 24*). 



Zenohiana prismatica (Risso) . 



1826. Zenohia prismatica, Risso, Hist. Nat. de I'Europe M^rid. -vol. v. 



p. 110, pi. V. fig. 24. 

 ? Idotea chelipes, 0. G. Costa, Fauna del regno di Napoli, Iihtea, 



p. 2, pi. xi. fig. 2 a, h, c. 

 1867. Idotea parallela, Bate & Westwood, I. c. vol. ii. p. 391. 

 1895. Idotea prismatica, Dollfus, I. c. p. 9, fig. 25. 



I have procured this species at Falmouth and have received 

 it from Paignton {Rev. T. R. R. Stebbing), Jersey {Sinel), 

 and the Adriatic {Prof. Claus). 



Genus 3. Stenosoma, Leach. 



1. Stenosoma lanciferum, Leach (MSS.). 



1867. Idotea appendiculata, Bate & Westwood (nee Risso), /. c. vol. ii. 



p. 396. 

 1895. Stenosoma lancifer, Dollfus, I. c. p. 6, fig. 13. 



Tide-marks, Exmouth (^4. M. N.) ; Polperro, Cornwall 

 {Lauglirin) j Ilfracombe [Rev. T.R. R. Stebbing) : all in Mus. 

 Nor. 



2. Stenosoma acuminatum, Leach. 



1837. Idotea acuminata, Bate & Westwood, I. c. vol. ii. p. 394. 

 1895. Stenosoma acuminatum, Dollfus, I. c. p. 5, fig. 14. 



I have never seen this species. It is not Idotea capitOj 

 Rathke, which Bate and Westwood give as a synonym. 

 Stenosoma capito I have from the Adriatic {Prof. Heller). 



Fam. Arcturidae. 

 Genus 1. Arctueus, Latreille. 



[Arcturus haffini (Sabine). 



1824. Idotea haffini, Sabine, Appendix Parry's Voyage, vol. iv. p. 50, 



pi. i. figs. 4, 6, 6. 

 1840. Arcturus baffini, H. M.-Edwards, Nat. Hist. Crust, vol. iii. 



p. 123, pi. xxxi. fig. 1. 

 1836-49. Arcturus baffini, H. M.-Edwards, Regne Animal d'apres 



Organ. Cuvier, Crustaces, pi. Ixx. fig. 2. 

 1876. Arcturus baffini, Wyville Thomson, The Depths of the Sea, 



p. 127. 

 1885. Ai-cturus baffini, G. 0. Sars, I. c. p. 97, pi. ix. figs. 1-21. 



* The genus occurs in the middle of a paragraph, which is scarcely 

 fair to recorders. It is not therefore noticed in ' Zool. Record.' 



