Clare Island Survey — Acarinida. 39 123 



terminal pair, ventral side armed with three pairs of hairs, of which the first- 

 is much shorter than the others ; end segment stout, with a dorsal hair, two 

 terminal hairs, and a short ventral spine. 



Locality. — Two specimens were dredged in Clew Bay at a depth of 

 24 fathoms on a bottom of gravel and shelly sand, 25th May, 1909 (Irish 

 Fisheries Station W. 84). 



Halacarus H.) areolatus sp. now (PI. VIII, fig. 39«, b). 



The present species is evidently allied to H. floridearum much more so 

 than the preceding form. The much broader frontal plate and the differently 

 sculptured genital area may be noted. The type specimen was unfortunately 

 injured during preparation, so that I am unable to give exact measurements. 



Male. — A small species, shape rather long and narrow, and with a 

 weakly ehitinized armature. Front margin of the body broad and 

 truncated. There is only one shoulder bristle. First dorsal shield 

 very broad, rounded posteriorly, though in an immature specimen, which 

 possibly belongs to this species, the hinder margin is slightly emarginate. 

 Second dorsal shield tongue-shaped, with a broadly truncated front margin, 

 separated from the first shield by a very narrow space, in which lie two small 

 hair- bearing plates. The eye-plates are rather small and of an oblong shape. 



Genito-anal plate large, its front margin reaches well in front of the last 

 pair of leg acetabula ; area genitalis semi-circular, with numerous hair pores, 

 which are rather widely separated ; at the sides of the porous area there is 

 present a group of from twenty to twenty-four distinct areolations in the 

 epidermis (fig. 39a). 



Capitulum large, basal part very broad and finely punctured ; rostrum 

 moderately long, apex not quite reaching the end of the second palp segment- 

 Third palp segment with a strong inner spine. Legs long and slender, and 

 of fairly uniform thickness ; the following hair armature applies to the first 

 pair -.—third segment, 2 dorsal and 3 ventral hairs ; fourth segment, 2 dorsal 

 and 2 ventral hairs ; fifth segment, 6 ventral hairs, of which the proximal 

 pair are spur-like, and 4 dorsal hairs ; end segment, 1 dorsal and 1 ventral 

 hair, the latter is short and spine-like (fig. o\)b). 



Locality. — Found amongst seaweeds on the shore of Blacksod Bay in 

 September (Irish Fisheries Station W. 234 . 



Halacarus (Copidognathus) gracilipes Trouess. 



Blacksod Bay, ? slightly immature, March ; in the same locality both 

 adults and nymphs were found in weed on the shore (Irish Fisheries Station 



B 2 



