202 The Irish Naturalist. Septemher, 



Plona rufa (C. L. Koch.)— Common iu Glencar Lake, and in Lough 

 GiU. 



EXPI^ANATION OF Pl^ATE lO, B. 



Fig. I, Eylais bicornttta, sp. nov. Eye-plate, magnified about 86 times. 

 Fig. 2, side view of mouth parts (capitulum), magnified about 35 times, 

 Fig. 3, Arrhenurus JMoebii^ Piersig. Male, dorsal view without legs or 

 palps, magnified. Fig. 4, Hydrachna distincta., Koen. Left eye-plate, one 

 of the paired eyes, and central unpaired eye, magnified about 62 times. 



Dublin. 



CRUSTACEA. 

 DECAPODA. 



BY W. RANKIN. 



Only the ordinary common shore species of this order were observed. 

 It is noteworthy, however, that, on the shore of Ballysadare Bay by Glen 

 Lodge, /<y//«;««xarw<7/'«j was extraordinarily abundant, more common than 

 even Carcintis manas. 



Belfast. 



AMPHIPODA AND ISOPODA. 



BY ROBERT PATTERSON, M.R.I.A. 



At Lissadill, Taliirus locmta was fairly common, but Onhestia littorea was 

 swarming under decaying seaweed on pebbles. A few specimens of 

 Orchestoidea Deshayesii were taken on the sea-shore, and Gammarus puhx 

 in the little stream in the demesne. G. pidex was also found in consider- 

 able numbers in Lough Gill and Glencar lake. At Strandhill, Gammarus 

 lociista was taken commonly between tide-marks, and Talitms lociista and 

 Orchestia littorea on the shore, the latter being much more plentiful than 

 T. locusta. Mr. Carpenter has kindly examined the Woodlice I took, and 

 staten they are Porccllio scaber and Oniscns asellus ot various ages. Ligia 

 oceantca was common under stones on the shore of Ballysadare Bay. 



Belfast, 



