41 2 Proceedings of the Royal Irish Academy. 



fine-ineshed nets to trawls worked over the ground, the use of a tow-net at 

 night, especially in the shallow bays and harbours, not only facilitates the 

 collection of species, but gives a better and more correct idea of the 

 abundance or scarcity of the different species collected. In the Cumacea it is 

 usually the males only which become free-swimming at night, but among 

 the Mysidae both sexes appear to be equally represented in night gatherings. 



The Stomatopoda are represented so far only by larval forms caught in the 

 tow-nets. These belong to two distinct genera ; but the species cannot yet 

 be definitely settled pending the capture of adidt specimens. 



The present report includes one species of Cumacea and one of Mysidae 

 new to Ireland and one species of the former and eight of the latter not 

 hitherto recorded from the district. 



SYXCAEIDA. 



Nebalia bipes (Fabricius). — Xebalia bipes is abundant throughout the district. 

 It is to be found at low water at spring tides, under stones on the shores, 

 and seems to prefer the neighbourhood of black, evil-smelling mud. It 

 is likewise frequently captured at night in tow-nettings taken in 

 harbours and sheltered bays. On one occasion a lobster, which had 

 died in the lobster-pot, was found to be covered literally with thousands 

 of this Crustacean. 



CUMACEA. 



Bodotria scorpioides Montagu). — Taken in nineteen gatherings from Bonn 

 Harbour, three from Fahy Bay, Ballynakill Harbour, and one from just 

 north of Cleggan Bay. It never occurred in very large numbers, and 

 was most abundant in the tow-nettings at night. Clew Bay, once. 



B. pulchella (G. 0. Sars . — Fahy Bay, Ballynakill Harbour, twice; north 

 entrance to Ballinakill Harbour, once ; Cleggan Bay, once ; Blaeksod 

 Bay, twice. 



Cumopsis goodsiri (van Beneden).— Feorinyeeo Bay, Blaeksod Bay, two males 

 and two females. Xew to Ireland. 



Iphinoe trispinosa (Goodsir). — One of the most abundant species in the area 

 in harbours and sheltered bays. Abundant in tow-nettings taken at 

 night in Ballynakill and Bonn Harbours ; Clew Bay, 5-11 fins., common : 

 Blaeksod Bay, 2-9fms., common. 



Vauntompsonia cristata, Spence Bate. — Occurs in considerable numbers in 

 Ballynakill Harbour. Common in night tow-nettings, but only male 

 specimens are captured in this way. Elly Bay, Blaeksod Bay, 1-4 fms., 

 three specimens. 



