56 COPEPODA AND OTHER CRUSTACEA TAKEN IN IRELAND 



*Lipura maritima (Gueriii). 



Podoceropsis excavata, Sp. Bate. 

 Erichthonius Hunteri, Sp. Bate. 



In pools at extreme low-water mark, Roker, 15th August, igoo. 



Ectinosoma melaniceps, Boeck. 



Dactylopusplatycheles, G. S. Brady. 



Thalestris Clausii, Norman. 



Zaus spinatus, Goodsir. 



Laophonte lamellifera, Claus. 

 Temora longicornis, Mullen Idya furcata, Baird. 



Acartia longiremis, Lilljeborg. Scutellidium fasciatum, Boeck. 



* An apterous insect belonging to the group CoUombola. It is met -witli not 

 unfrequently on tlie surface of tidal pools on many parts of the British coast, but 

 I am not aware of any record of its ocouiTcnce in the Northumberland and Durham 

 district. 



Genus CYCLOPS, Miiller. 



Cyclops eboracensis, sp. nov. (PI. I., figs. 12-14). 



Antennules very short and stout, six-jointed (fig. 12), the 

 first three joints extremely thick, last three suddenly much 

 more slender, the first joint is about as broad as long, second 

 three times as broad as long, third considerably longer than 

 broad : the following formula represents the comparative 

 lengths of the joints : 



I- 2. 3. 4. 5. 6. 



12 4 13 5 2 4 



The swimming feet (fig. 13) are short, all the branches are 

 three-jointed, and the marginal spines of the outer branches 

 are long and slender; caudal laminae (fig. 14) of moderate 

 size, about twice as long as broad, rather longer than the last 

 abdominal segment, bearing two long but unequal terminal 

 setae, on each side of which are two very dehcate short hairs, 

 and on the outer angle a much stronger but short seta ; near 

 the middle of the outer margin is a minute seta, and another 

 between it and the apex. 



Hab. — In tidal pools at Filey Brigg, Yorkshire, among 

 weeds. 



Only one specimen of this curious Cyclops was found. 

 There can, I think, be no doubt that it is a perfectly 

 developed adult. It seems to approach very closely C. 

 christianensis, Boeck, but differs from that species in having 



