326 Part III. — Fifteenth Annual Report 



Cyclocypris serena and Cyclocypris Icevis. 



In the Appendix to the Second Part of the ' Monograph of the Marine 

 and Fresh- Water Ostracoda of the North Atlantic and North-Western 

 Europe,' by Drs Brady and Norman, various changes in the nomenclature 

 of the Ostracod-fauna have been introduced, in order to bring the Mono- 

 graph more into line with the results of recent investigations. One of the 

 effects of this has been the removal of the two species referred to above 

 from the genus Cypria, Zenker, to Cyclocypris, Brady and Norman. 



Among other changes introduced in the Appendix to the Monograph, 

 the following have reference to species recorded in the present paper : 

 llyodromas Robertsoni (Brady and Norman) = Herpetocypris Robertsoni, 

 Brady and Norman. 



The genus Ryodromas was instituted by Prof. Sars in 1894, to include 

 one or two aberrant species of Herpetocypris, and Herpetocypris Robert- 

 soni was one of these. 



Pionocypris vidua (O. F. Muller). 



This is recorded in previous papers as Cypridopsis vidua. But Drs 

 Brady and Norman have now instituted the new genus Pionocypris for 

 this and one or two similar forms. 



Candona compressa (Koch). 



This was previously recorded as a form of Candona pubescens, but it is 

 now considered to be distinct. 



Ryocypris biplicata (Koch). 



Two Ostracod forms have been described under the name of Cypris 

 (afterwards Ryocypris) gibba, — a distinctly tuberculated form, and one 

 only bisulcated. Prof. Sars, in separating these two forms, retains that 

 which is tuberculated under the old name, and gives to the simply bisul- 

 cated form the name of Ryocypris Bradii. Drs Brady and Norman, 

 in their Appendix, state, in referring to this, that if the simply bisculated 

 form is to be recognised as distinct, it should bear the name of Ryocypris 

 biplicata, as it appears to be identical with Koch's specimens of that 

 name. The specimens from Linlithgow Loch recorded in this paper are 

 all simply bisulcated, and I have for the reasons stated recorded them 

 under Koch's specific name. The only locality where I have obtained 

 typical tuberculated specimens was in the Union Canal near Edinburgh. 



Darwinula Stevensoni, Brady and Robertson. This, which is compara- 

 tively a rare species in Scotland, was obtained sparingly in both of the 

 Forfarshire Lochs referred to in this paper. 



Alona rustica, T. Scott. 



This distinct Cladoceran, which has hitherto been obtained only in lochs 

 in the Outer Hebrides and in Shetland, was one of the species found in 

 the gathering from Black Loch near Campbeltown. 



Leptodora hyalina, Lilljeborg. 



Leptodora occurred in the gathering from Loch Rescobie, but appeared 

 to be very rare. It is probable, however, that if a boat and tow-net 

 were employed in the examination of the loch it might be found to be more 

 frequent 



