Halhkui' — Tlic Acaniia oj the Seashore. 137 



Tlio opimcial area ami the genital foramen are much as in T. siro; close 

 to the end margin of the ventral sitlo are two long hairs, and there are a 

 few pairs of short hairs. Legs mirnial ; Uiu fmirth segments carr}- the usual 

 long hair, and a strong curved spine springs from the fifth seguicnt of first 

 two pairs. 



MkJi: — The only male found was mounted in glyceriue medium, so that 

 tlie sliape cannot be exactly described. A drawing (Hg. 20 c) made 

 shortly after capture is probably sufficiently accurate. Much smaller than 

 female, length about o60/( ; breadth, 220/i ; broadest across the foie part of 

 the abdomen ; the posterior margin is clearly indented at the centre, and 

 immediately over the notch is a small papilla. All the hairs of upper 

 surface as in female, but relatively much longer. Expulsory vesicles very 

 large. The genital plates form a semicircular shield, and there are two 

 copulatory discs closely resembling the same structui'es in Histiofjastcr 

 eiitomophagus (37, PI. XXVII, fig. 20 d). Legs robust and characteristic of 

 the genus, except for the last pair ; the tarsal segments of these, instead of 

 having two small raised discs near the middle of the segment, have only 

 one disc, which is placed close to the base on the upper and inner surface 

 (fig. 20 d). ■ ■ 



Habitat. — Two females and a male found in moist decaying seaweeds 

 amongst shingle close to the harbour at Howth, Co. Dublin. The locality is 

 slightly above high-water mark, and evidently within reach of high tides, 

 September, 1918. 



Family HYADESIDAE. 



Hyadesia fasca (Lohm.). 



1894 Lcntunr/ula fxsca. 32, p. 86. 1899 Canestrini and Kramer 24, 

 p. 136. 1901 Michael 37, p. 196. 1907 I.ohmann 34, p. 368. 1915 Halbeit 

 25, p. 108. 



Adults and nymphs occurred in nuiiibers at the edges of rock crevices in 

 the Pelvetia and Spiralis zones at Malahide, June, 1916. In the same 

 locality it was found fairly commonly in rock-pools containing much 

 Enteromopha, in the Orange Lichen zone, -Tuly and September. First 

 recorded as a British species from Clare Island, where it is abundant amongst 

 coralline seaweeds in rock-pools. Lohmann gives its distribution as the 

 North Sea and the lialtic. 



U.\.A. PKOC, VOL. XXXV, SECT. li. [S] 



