46 10 Proceedings of the Royal Irish Academy. 



NOTES ON SOME OF THE SPECIES. 



Piaphanosoma brachyurum (Lievin) var. nasuta Kane. — This variety, first 

 described by Mr. Kane from Loughs Mask and Corrib (19), has now been 

 found by him in Glencullin Lough within the Survey area. So far as the 

 evidence goes at present this is one of the forms which seem to specially 

 connect the fauna of the west of Ireland with Scotland, and possibly also 

 with Scandinavia, for a practically identical variety has been found in the 

 first-named country, and exceedingly closely allied varieties (e.g. producti- 

 frons Sars and frontosa Lilljeborg) in both Norway and Sweden, whereas 

 similar forms have not yet been found in other parts of Ireland or in 

 England and Wales. 



Latona setifera (0. F. M.) — Only one specimen of this rare species was found in 

 a collection from a bog-pool near Sraheens Lough, Achill. It is recorded 

 for the first time for Ireland. 



Holopedium gibberum Zaddach. — This record depends upon a single specimen 

 taken by Mr. Kane in L. Keel, Achill (19) before the commencement 

 of the Survey. Previously Mr. Kane had found it at Ballynahinch, 

 Connemara, and in L. Mask (17). It has not been found elsewhere in 

 Ireland. 



Daphnia obtusa Kurz var. — The form referred to is a rather small variety 

 (maximum size tj") showing the characteristic obtusa bump supporting the 

 first antennae in a very marked degree. Its shell spine is not so excessively 

 short as in the typical form of the species, but corresponds with what is 

 found in the variety "propinqua." It may be the same as the form 

 figured in Lilljeborg's ' Cladocera Sueciae,' Tab. xi, fig. 7. I have seen it 

 on several occasions in various parts of the British Isles and it has 

 always been rose-pink in colour, quite different from the usual reddish 

 tint of typical D. obtusa. The specimens seen, which included males and 

 ephippial females as well as ordinary parthenogenetic females, were 

 found in a bog-pool near Valley Lough, Dugort, Achill. 



Simocephalus exspinosus (Koch). — Only seen from a bog-pool at Louisburgh 

 by Mr. Kane. Although a comparatively common species in the south 

 and east of England, it seems to be much rarer in other parts of the 

 British Isles. 



Ceriodaphnia pulchella Sars. — Only found in Castlebar Lough. In spite of its 

 close relationship to C. quadrangula, the two species seem to be mutually 

 exclusive, not only in the same piece of water, but in the same district. 

 The present form is characteristic of what may be called, for want of a 

 better name, " lowland " country. 



