DUBLIN WATXTKiJ. HI8T0KY SOCIETY. 183 



Zettrigonut Fahrieii (?). — ^This occurred with the last, but in fewer num- 

 bers. It is singular that in the supplement to Pany^s " Voyage,'* 

 this is figured as having occurred also along with the last. Can there 

 be any intimate connexion, such as sexual, between them ? I find 

 some trifling differences between my specimens and L. Fahricii 

 (Milne-Edwards), but await my friend Spence Bate's judgment on 

 the point, I strongly suspect that Gosse has mistaken this animal for 

 Metoicus medusarumj the distinction between the genera being such 

 as to easily cause a mistake. This is doubtless the species "W. 

 Thompson failed to identify, owing to the bad condition of his 

 specimens. 



The two following species, found by me in Dublin Bay, have not 

 hitherto occurred at Belfast : — 



Iphimedia Ehlana Found in Hhizostoma Cuvieriy Dublin Bay. 



Chelura terebrans. — Extremely common in submerged timber at Kings- 

 town and Howth. 



Crustacea Isopoda. 

 I here note only the species actually obtained and identified ; several 



yet await the latter process; this list is, therefore, an approximation 



only. 



Arcturm longicornis. — Two specimens, dredged off Gobbins. Korth 

 Bull, DubHn. * 



Idotea pelagica. — Common in all suitable localities here, as also in 

 Dublin. 



Idotea tricuspidata. — A more markedly deep-water species than the last ; 

 Whitehead; Ballyholme Bay. Dublin Bay, Dalkey Sound, very 

 common. 



Idotea emarginata. — Specimens in Belfast Museum. Very rare in Dub- 

 lin, but has been taken in Dublin Bay. Coast of Wexford, Dr. E. 

 Perceval Wright. 



Limnoria terebrans. — In the piles, ship-yard, Carrickfergus, extremely 

 abundant. Eingstown Harbour, and How th and Malahide, very nu- 

 merous. In Dublin this species is always associated with Chelura 

 terebrans. I searched carefully for this lafter at Carrickfergus, in 

 company with Professor Wyville Thompson, but unsuccessfiilly. 

 Professor Thompson informed me that he had never succeeded in 

 finding Chelura in Belfast, although he had looked carefully for it. 

 W. Thompson, in his '' Fauna," makes the same remark. 



Asellua aquaticus. — A small stream, near Carrickfergus. Dublin. 



Jaera albifrons Carrickfergus. Dublin (?). 



Spharama $erratum. — River Lagan, Belfast. Biver Dodder, Dublin. 



Spharama rugicauda. — Blackhead. 



Nescea bidentata. — Carrickfergus. Loughshinny; Dublin. Cork, on 

 authority of Professor J. Reay Greene. Roundstone, W. M'Calla, 

 q.v. 



