140 The Irish Naturalist J"ne, 



CyprlS blspinoSRf Baird. — When Mr. E. Waller and I were 

 together at Valentia in 1870 he brought me some living examples of 

 this splendid species, which he had procured in a small pond, which 

 I think was on an island in the harbour. The types described by Baird 

 were from North Africa, where it has since been again found. Very 

 many years ago the late Dr. Lukis gave me some examples which he 

 had taken in Guernsey. Judging from its known habitats it would 

 seem to be a species which likes a little taste of salt in the water 

 which it inhabits. 



Genus4.— Cyprlnotus, G. S. Brady. 



Cyprlnotus prastnus (vS. Fischer).— The Cyprinotus salitius of Brady is 

 undoubtedly a synonyn of Fischer's species. That author found his 

 types at Palermo in Sicily, where I have myself taken the species in 

 the Botanic Gardens. Cyprinotus prasinus, Cypridopsis aculeata, and 

 Cytheridea torosa are three Ostracoda which, although found also quite 

 inland, seem to prefer water not far from the sea which has some 

 slight admixture of salt ; and Cypris incongruens may perhaps be 

 associated with them. They must not; however, be classed with 

 denizens of such brackish water as is the home oi Hydrobia ventrosa, 

 Alderia modesta, PaloRmonetes varians, Neomysis vulgaris, SphxromU 

 rugicauda, Idotea viridis Slabber ( = /. salinarum Dollfus), Corophium 

 grossipes, Lexoconcha viridis, Cytherura gibba, many Copepoda, and of 

 Foraminifera, Nonionina depressula, and Polystomella striatopunctata, all of 

 which species are peculiarly tjpical of brackish water, and are found 

 neither in absolutely salt nor in absolutely fresh water. Bally- 

 vaughan, Co. Clare ; Newport, Co. Mayo; and in a locality far inland, 

 a mountain tarn at Braggan, Co. Monaghan (A.M.N.). 



Genus 5.— Hcrpctocyprls, Brady and Norman. 



Herpetocyprls reptans (Baird). — l/ough Neagh (A.M.N.) ; Lough 



Erne and Achill (Kane !) ; Loughs in Mayo and Galwaj', and Grand 

 Canal, Dublin (B. and R.) 

 H. tumefacta (Brady and Robertson). — Cornacassa near Monaghan 

 (A.M.N.). 



Genus 6.— Ilyodromus, G O. Sars. 



Ilyodromus ollvaceus (Brady and Norman).— Mr. de Vismes Kane 

 sent to me for determination specimens taken in Upper Lough Erne. 



Genus 7.— PlonocyprIs» Brady and Norman. 



Plonocypris vidua (O. F. MuUer).— Lough Neagh, CregdvifF Lough 

 near Roundstone, and many places near Monaghan (A.M.N.) ; 

 Loughs in Mayo and Galway, and Grand Canal, Dublin (B. and R.). 



P. obesa, Brady and Robertson.— Belfast and Mullingar canals, and 

 Loughs in Mayo and Galway (B. and R.) I believe that this must be 

 united with the last, but Prof. G. O. Sars keeps them distinct. 



