October, 1907. The Irish Naturalist. 305 





ADDITIONAL RECORDS OF FRESH-WATER 

 ENTOMOSTRACA IN IRELAND 



BY W. F. DE V. KANE, M.A., M.R.I.A. 

 [Pl<ATE 41.] 



Since the publication of my list of Irish fresh-water Cla- 

 docera 1 a valuable catalogue of the Irish Crustacea Ostracoda 2 

 (including marine species), compiled by the Rev. Canon 

 Norman, has appeared. Mr. Scourfield's Synopsis of British 

 Fresh-water Entomostraca 3 also contains several notices 

 of Irish localities. 



The following list will complete these records to date, 

 including some unpublished captures of species belonging to 

 the groups of Ostracoda and Copepoda. The difficulty of 

 identifying dead specimens of the rarer species of Copepoda 

 hinders much advance in our knowledge of their distribution 

 in Ireland, since the student of this group requires to bring 

 his apparatus with him, as well as books of reference, when 

 he undertakes a research at any distance from home. 



CLADOCERA. 



Diaphanosoma brachyura, Lievin, var. nov. nasuta. In a note 

 to my former list I referred to the discovery of a remarkable form of 

 this species which I took in L. Mask. I have since been favoured 

 with a letter from Canon Norman mentioning that he finds in his 

 collection specimens of this new variety taken in Loch Awe. Mr. 

 Scourfield also has sent me identical examples from Loch Tarff. So 

 that its distribution extends to Scotland. A variety has been 

 described by Prof. G. O. Sars from Norway, which he named var. 

 prodiuti from, which presents a modified approach to var. nasuta, the 

 ocular part of the head being unusually prominent. But he 

 informs me (in litt.) that the form now described is quite new to 

 him. 

 Description.— The upper third of the cephalic region is narrowed, 



and projects forward at an angle obtuse to the direction of the long axis 



1 Irish Nat., vol. xii., p. 210. 



* lb., vol. xiv., p. 137. 



3 fourn. Quekeit Micros. Club, 1903 and 1904. 



