118 Proceedings of the Royal Irish Acndemji. 



Length, S74:fi; breadth, 130yu. Anterior part of tlio sternum (lig. 2 c) like 

 tliat of female, Init tlie plate is much longer, wideniiic inio a wcilge-sliape at 

 tlic end margin of the fourth acetahula. Genital foramen large, with a thick' 

 chitinous border; sternal liairs, five. Ventro-anal plate very large, its 

 llattene<l front margin lying close to the sternum, and the posterior margin 

 reaching end of body. 



Chelicerae (fig. 2 d) minute and curved ; fixed chela with one strong tooth 

 and a sinuate chitinous process rising from its base ; length about twice that 

 of the chela. In its natural position, as seen from below, the process points 

 inwards and downwards, apex liooked. Free chela with one strong central 

 tooth and two small teeth close to the apex of the segment. Legs as in tlii' 

 female ; second pair a little stouter than the others; unarmed. 



Habitat. — An undoubtedly intcrtidal species occurring in ilic Orange 

 I lichen and IVlvetia zones at Malahide. It lives in fissures and between 

 Hakes in from dry to moist places where there is little silt, occasionally in 

 spots that have not been covered i>y the tides for several day.s. The sexes 

 a|)peur to occur in about etpial numbers, and females with eggs were collected 

 in February and September, the earliest and latest months in whiih ili(> 

 species was noticed. 



Qamasus Kempersi Oudms. 



1902 Oudemans 43. p. .'36. 190G Herlese 11, p. U.". lOlG Halbert 25, 

 p. 49. 191S Hull 26, p. 8-i. 



A aiKJcies characteristic of the high-water mark level. It is often aliun- 

 danl there under stones and seaweed and amongst moist, shelly sand and 

 L,'ravel, in places where there are usually few other species of mites. On the 

 rocky Malahide shore I did not (ind it l»elow tlie IVlvc-tia zone, though it 

 probably doe.s oceur in the lower zones. Also found in the Westport district, 

 and very generally on the Dublin coast. The dales of captuie range from 

 February to November. 



GamasuB lunaris Oudms. 



1882 Gamnam ruhcsctiui G. et K. Can. " Gamasi Ital.," p. 42. 1892 

 G. riihfscena Berlcse 2, Fasc. LXix, n. 9. 1903 G. ndjcscem Oudemans 41, 

 p. 78. 1906 0. /MiwrwBerlese 11. p. 147. 191.". Halbert 25, p. r,0. 1918 

 Hull 26. p. 83. 



Found under decaying seaweeds washed Iiy the tides into the Orange 

 Lichen zone at Malahide, August, 1915. It was fouml under similar condi- 

 tions on the seashore at We8ti)ort. Possibly not a regular denizen of the 

 intcrtidal area. 



