Southern — Monograph of the British and Irish Oligochceta. 131 



Family ^OLOSOMATID^. 

 ^olosoma Hemprichi Ehrbg. 



1869. A. quaternarium, Lankester in Trans. Linn. Soc. London, vol. xxvi., 

 p. 641. 



August (im.). 



Habitat — Ireland. In weeds from R Dargle, Powerscourt, Co. Wicklow, 

 in company with several Naids and Ehabdocoels. 



Distribution— ^\\g\d,\\i\. (Lankester, torn, cit.) ; Europe, Soudan, North 

 America (Illinois). 



^olosoma variegatum Vejd. 



1889. A. v., Beddard in Proc. Zool. Soc. London, p. 52. 



April (im,). 



Habitat — Ireland. In weeds from E. Annalee, Ballyhaise, Co. Cavan. 



Distribution— Coxk {^qMom^, tom. cit.); Germany; Bohemia. 



Family NAIDID-ffi. 



I have not been able to give very much attention to the Naididse. They 

 have, however, been fairly well worked in England. The most interesting 

 record is that of OjjMdonais Reckei Floer. 



Chsetogaster diastrophus (Gruith.). 



1892. C. d., Benham in Q. Journ. Micr. Sci., vol. xxxiii., p. 212. 



In the Irish specimens of this species, the prostomium, though distinct, is 

 not so prominent as Vejdovsky (28, Taf. vi., fig. 11) figured it. The chitinous 

 plate, which lies at the back and under the brain is very conspicuous. 

 There are 6-7 setse in a bundle, those on the second segment being 

 considerably larger than the others. The nerve-cord has a very irregular 

 outline, as though fringed with glandular outgrowths. The length is 1-2 

 mm.; and the individuals consist of 10-12 segments. It is interesting to 

 watch these worms working their way rapidly through close-set weeds. The 

 anterior bundles of setse can be thrust forward, and expanded like a fan, and 

 are used like claws, to drag the rest of the body forward. 



January (im.). April (im.). May (im.). August (im.). 



Habitat — Ireland. E. Dargle, at Powerscourt, Co. Wicklow ; E. Annalee, 

 Ballyhaise, Co. Cavan ; Pond in Phoenix Park, Dublin. 



Distribution — Middle Europe. 



