SouTHEHN — Monograph of the British and Irish Oligochceta. 1 39 



Tubifex ferox Eisen. 



1891. Sinrosperma ferox, Benham in Q. Joiiin. Micr. Sci., vol. xxxiii., 

 p. 207. 



1895. Spirosperma ijapillosus, Beddard in Monograph Olig., p. 263. 

 Mature — April, May. 



Hahito.t — Ireland. E. Annalee, Ballyhaise, Co. Cavan. 

 Distribution — England, Europe. 



Tubifex Benedeni (Udek.). 



1889. Hemituhifex ater + H. henedii, Beddard in Proc. Zool. Soc. 

 London, p. 486. 



1892. Jll. ater, Benham in Q. Journ. Micr. Sci., vol. xxxiii., p. 187. 

 This species occurs in large numbers between tide-marks at various 



places on Dublin Bay. The specimens I examined all had capillary setse in 

 the dorsal bundles. The form recorded by Friend as Hemituhifex henedii 

 (14, p. 120; 12, p. 128) was obtained from Malahide, in freshwater, and 

 there is no reason to think it belongs to this species, which is always found 

 in the marine littoral zone. There are several species of Tubifex living in 

 fresh water, and having the skin covered with papillae ; and Friend's worm 

 might have belonged to any of those so far as one can tell from his 

 description. 



Mature — June. 



Habitat — Ireland. Co. Dublin (Sandymount, Sandycove). 



Distribution — Coasts of England ; France; Belgium; Germany; Denmark. 



Tubifex barbatus (Grrube). 



1871. T. liinhellifer, Lankester in Q. Journ. Micr. Sci., vol. xi., p. 181. 



1892. T. h., Benham in Q. Journ. Micr. Sci., vol. xxxiii., p. 208. 



Mature — February. 



Hahitat — Ireland. Lough Neagh. 



Distribution — England ; Europe. In fresh water. 



Tubifex costatus (Clap.). 



1892. Heterochoita costata Clap., Benham in Q. Journ. Micr. Sci., vol. xxxiii., 

 p. 188. 



1897. H. c, Friend in Irish Nat., p. 63. 



Matiore — February. 



Hcdiitat — In rock-pjols, between tide-marks, Malahide, Co. Dublin. 



Distribution — England ; France ; Denmark. 



