Clare Island Survey — Acarinida. 39 125 



Harbour in from seven to nine fathoms, August (Irish Fisheries Station 

 W. 196), and Kinsale Harbour, two to five fathoms, in weeds during May 

 (Irish Fisheries Station E. 45). 



Distribution. — North Sea ; English Channel ; Atlantic. Littoral region 

 down to 58 metres (44). 



Halacarus (C) tdbellio Trouess. 



Has been found in rock-pools at Malahide and Howth on the Dublin 

 coast. 



Halacarus (C.) lamellosus var. septentrionalis nov. (PL VIII, iigs. 40a, b). 



There seems no doubt that two examples of a Halacarus dredged in Clew 

 Bay are to be referred to a variety of H. lamellosus, Lohmann, and in all 

 probability represent a northern form of this species. 



Male (fig. 40a). Compared with the typical form as described and figured 

 by Lohmann (41) the present variety is much larger (length 396^-410/^, 

 breadth about 242/x). The marginal lamellae of the third segment of the 

 first pair of legs are greatly reduced, or are absent. This segment is also 

 relatively longer, about equalling the fifth segment in length. There is only 

 a faint trace of a lamella on the corresponding segment of the second pair of 

 legs. The lateral extremities of the leg segments are strongly produced, as 

 in the type form. Length of first leg (fig. 406) about 330/x ; there are two 

 short spines and a fine hair on the under surface of the fifth segment. 



The extremity of the last palp segment is about on a level with the end 

 of the fourth segment of the first pair of legs, in the typical form it evidently 

 overreaches it considerably. The second dorsal shield is narrower and of 

 more uniform breadth throughout ; it is very long, truncated in front, and 

 almost touches the posterior margin of the first dorsal shield. 



Locality. — Clew Bay, County Mayo, dredged in 24 fathoms on a bottom of 

 gravel and shelly sand, 25th May, 1909 (Irish Fisheries Station W. 84). 



H. lamellosus has been recorded by Lohmann (44) from the Atlantic 

 littoral (Bermudas, mouth of the Amazons), and from the Pacific Ocean 

 (Sydney). Trouessart has also recorded it as having been dredged on 

 Lithothamnion coralloides in the English Channel (Saint- Vaast-la-Hougue). 

 The specimens from the last-mentioned locality are without leg lamellae and 

 possibly belong to the present variety (94). 



Halacarus (C.) Fabricii (Lohm.) 



Blacksod Bay, the nymph and adults were found amongst weeds on the 

 shore during September (Irish Fisheries Station W. 234,. Elsewhere on the 



