46 12 Proceedings of the Royal Irish Academy. 



Pleuroxus trigonellus (O.F.M.). — Not found during the progress of the Survey, 

 but recorded by Brady and Robertson from near Westport (9). 



Chydorus latus Sars. — Specimens appearing superficially at least to belong to 

 this species have been seen both by myself and Mr. Kane on several 

 occasions, but I am not quite sure that they are to be looked upon as 

 distinct from C. sphaericus. 



Monospilus dispar Sars. — Recorded many years ago from Westport by Brady 

 and Robertson (9), but not seen since in any part of Mayo and Galway. 



Diaptomus sancti-patricii Brady. — It is very unfortunate that this species is 

 not more certainly characterized, and that it should not have been 

 recognized since first taken by Brady in Connemara (5). If it is really 

 distinct from D. laciniatus, it is one of the very few species peculiar to the 

 British Isles. If, on the other hand, it is identical with that species, it 

 is still one of the forms linking the west of Ireland with Scotland and 

 Scandinavia. 



Eurytemora velox (Lilljeborg). — On Clare Island this species was only found 

 in Kinnacorra marsh pond, where the water is distinctly brackish, while 

 the Achill locality was a bog-pool near Valley Lough, Dugort, in which 

 the water was apparently quite fresh. Although now recorded for the 

 first time in Ireland, it is probably by no means an uncommon form in 

 slightly brackish water all round the Irish coast. 



Cyclops languidus Sars. — The Clare Island stations for this species are Creggan 

 Lough and a pond near the old Signal Tower at the extreme west of the 

 island. In Achill the species was found in collections made from the 

 moor north of Sraheens Lough. New to Ireland. 



Cyclops nanus Sars. — Only recorded from the moor north of Sraheens Lough, 

 Achill. New to Ireland. 



Cyclops vernalis Fischer. — Of the two Clare Island stations one was the pond 

 near the Signal Tower already mentioned, and the other a brackish pond 

 in the marsh near the hotel. In the latter case the first antennae were 

 18-jointed owing to the splitting of what is ordinarily the 7th joint (of 

 17-joiuted species) into two. The fourth and fifth were also partially 

 split. In the Westport district this species was seen in the river at 

 Belclare and in Barley Hill Lough. New to Ireland. 



Cyclops bisetosus Reh berg. — Only seen in the brackish Kinnacorra marsh 

 pool, Clare Island. The specimens were pitted in the same way as is 

 usual in C. bicuspidatus. New to Ireland. 



Cyclops bicolor Sars. — The solitary record for this species was from Barley 

 Hill Lough, Westport. New to Ireland. 



