442 Canon A. M. Norman on British Isopoda. 



1851. Idotea entomon, Daly ell (nee Linne), Powers of the Creator, &c. 



vol. ii. pi. Ixiii. dg. 9. 

 1897. Idothea granulosa, G. 0. Sars, I. c. p. 82, pi. xxxiv. fig. 1. 



This form, liitherto confused with the last, has been found 

 by me at Hartley, Northumberland, and occurred among 

 some Crustacea taken at Berehaven, Ireland, and sent to me 

 by Professor Haddon for identification. 



3. Idotea negJecta, G. O. Sars. 



1895. Idotea marina, Dollfus, /. c. p. 7, fig. 22. 



1897. Idothea neglecta, G. O. Sars, /. c. p, 84, pi. xxxv. fig. I. 



I have for many years doubted whether this should be 

 regarded as a variety of /. halthica or a distinct species. The 

 following circumstance has satisfied me that Sars is right 

 in separating it : — I. halthica and the present form occur at 

 times in great profusion at Plymouth. At my request the 

 Director of the Marine Laboratory sent me a large bottle full 

 of specimens ; there were many hundred specimens of each 

 form (/. halthica and /. neglecta) of all ages, and I was able 

 to separate the specimens of all ages without hesitation as to 

 a single example. I also have specimens from Shetland and 

 Falmouth, and found it in four localities on the Norwegian 

 coast, ranging from Bergen Fiord to Vadso, Finmark. 

 Dr. Thomas Scott has just recorded its occurrence in the 

 Moray Firth (' Twenty-second Eeport Fishery Board for 

 Scotland,' 1904, p. 257). 



4. Idotea viridis, Slabber. 



1778. Oniscus viridis, Slabber, Naturk. verlistigengen, p. 104, pi. xii. 



figs. 4, 5. 

 1889. Idotea phosphorea, Hoek (nee Harger), Crustacea Neerlandica, 



ii. (Tijds. Ned. Dierk. Ver. (2) Deel ii.) 1889, p. 7, pi. vii. figs. 2 



& 2 ?•. ' 

 1895. Idotea salinarum, Dollfus, I. c. p. 7, fig. 21. 

 1897. Idothea viridis, G. O. Sars, /. c. p. 83, pi. xxxiv. fig. 2. 



This elongated and narrow species is essentially an inhabi- 

 tant of brackish water. My finest specimens are from Alde- 

 burgh, Suffolk, and I have received it from Mr. W. Bateson, 

 who took it at Southwold on the same coast. I have also 

 found it in Arnold's Pond, Guernsey, and in the Fleet at 

 Weymouth. 



5. Idotea pelagica. Leach. 



1867. Idotea pelagica. Bate & Westwood, I. c. vol. ii. p. 384. 

 1895. Idotea pelagica, A. Dollfus, I. c. p. 8, fig. 23. 

 1897. Idothea pelagica, G. O. Sars, /. c. p, 81, pi. xxxiii. 



