39 124 Proceedings of the Royal Irish Academy. 



W. 233), and adults were dredged in four fathoms during the month of 

 September (Irish Fisheries Station W. 232). 



This beautifully sculptured species is evidently not uncommon in Blacksod 

 Bay, the only Irish locality in which it has been found. Two varieties have 

 been described by Trouessart ; apparently the Irish specimens belong to the 

 typical form. 



Distribution. — Littoral and abysmal regions, to a depth of 1410 metres, 

 Trouessart (95). North Sea (44 Atlantic; Mediterranean (92). Trouessart 

 has recorded it from the English coast. " Cotes d'Angleterre, iles Silly fsur 

 une preparation communiquee par M. Brady, confondue avec Halacarus 

 ctenopus) " (91). 



Halacarus C.J gibbus Trouess. 



Clew Bay, adults dredged in 24 fathoms on gravel and shelly sand, May 

 (Irish Fisheries Station W. 84). 



A variable species, of which no fewer than five distinct forms have been 

 described by Trouessart (92, &c). The Irish specimens were all dredged in 

 the one locality, and in spite of their small size they appear to me to belong 

 to the type form. At least they possess the sharp frontal process of the dorsal 

 shield, the longer legs, strong lamellae, and the capitulum is distinctly swollen 

 at the sides. The measurements are about 400^ in length, by 242;< in 

 breadth. 



Distribution. — Has been recorded from the North Atlantic (French coast, 

 aud the Azores 91, 44), with varieties in the English Channel, Mediterranean , 

 South Pacific, and in the Indian Ocean 45). 



Halacarus (C.) oculatus Hodge. 



Blacksod Bay, dredged in four fathoms, September (Irish Fisheries Station 

 W. 232). Has also been found in Malahide Jnlet on the Dublin coast, July, 

 and in Kinsale Harbour in from two to five fathoms, May (Irish Fisheries 

 Station R. 45). 



Distribution. — Apparently a widespread species. Baltic; North Sea; 

 Atlantic (coasts of Britain, and as far south as Kerguelen in the South 

 Atlantic, Lohmann, 45). Trouessart records it from a depth of 1410 metres 

 (95). 



Halacarus (C.) rhodostigma Gosse. 



Blacksod Bay, adult dredged in three fathoms, March (Irish Fisheries 

 Station W. 181). Additional localities on the Irish coast are — Valencia 



