Clare Island Survey — Fresh-water Eniomostraca. 46 ll 



Ceriodaphnia affinis Lilljeborg. — Barley Hill Lough, near Westport, is the only 

 place where this has been found. It is decidedly rare in the British 

 Isles, there being but three previously recorded localities for it, two in 

 England and one in Scotland. 



Bosmina longirostris (O.F. M.). — Only obtained from Islandeady Lough between 

 Westport and Castlebar. The particular form seen seems to be close or 

 identical with the var. similis Lilljeborg. 



Ilyocryptus sordidus Lievin. — A post-abdomen only of this species was seen in 

 a collection from a deep pond on the moor between Dugort and Achill 

 Sound. 



Acroperus angustatus Sars. — Under this name are included all forms of 

 Acroperus having the dorsal and ventral margins nearly straight and 

 nearly parallel. Some of them would probably come under A. neglectus 

 Lilljeborg, but it is very doubtful if that form can be regarded as a good 

 species. 



Alona intermedia Sars. — Found only in the deep pond already alluded to under 

 Ilyocryptus sordidus and in Castlebar Lough. The previous British 

 records of this species have all been from Scotland ; and as it also occurs 

 in Norway and Sweden, it may perhaps be looked upon as one of the 

 representatives of the fauna common to the west of Ireland, Scotland, 

 and Scandinavia. 



Alona rustioa Scott. — The two stations for this are Sraheens Lough, Achill, 

 and Groaghpatrick. In the latter case the specimens were only obtained 

 by washing wet mosses. 



Rhynchotalona falcata (Sars.) — I obtained this rather rare species from the 

 deep pond previously referred to under I. sordidus and A. intermedia, and 

 Mr. Kane found it in Eoonah Lough and a neighbouring lakelet, and also 

 in Glencullin Lough. Brady and Eobertson record its occurrence in 

 Lough Moher in the Westport district (9). 



Alonella exigua (Lilljeborg). — This species, as distinct from A. excisa, is now 

 definitely recorded for the first time for Ireland. As both species were 

 formerly included under A. exigua, it is impossible to say whether the 

 Lynceus exiguus recorded by Brady and Eobertson from Connemara (9) 

 included the typical form or not, and Mr. Kane also informs me that the 

 entry under this name in his " Additional Records " (19), p. 307, should 

 be deleted, being uncertain. From the number of stations where it has 

 been found, it does not appear to be a rare form in the district under 

 review, although by no means approaching its very near relative A. excisa 

 in abundance. 



B 2 



