Clare Island Survey — Acarinida. 39 87 



The most interesting feature about this genus is the absence of marginal 

 plates. On the Dublin coast I have found an undoubted species of Phaulo- 

 cylliba, which from its much smaller size and peculiar habitat evidently 

 represents an undescribed species. 



Male (fig. 27a). — A small yellowish brown, oval-shaped species; the 

 measurements are — length about 670,u, breadth 486^. The dorsal shield is 

 large, very finely punctured, and also with larger punctures. There is a 

 double row of short adpressed hairs on the middle of the dorsum, and a few 

 scattered hairs towards the sides. Marginal plates absent, so that the 

 body margin from behind the shoulders is unprotected (fig. 27b) with seven 

 or eight pairs of short spines, two pairs of these, at the end of the body, 

 are longer than the others. 



The ventral plate is large, and leaves uncovered a narrow body margin 

 behind the last pair of legs. The fossutae pedales of the fourth legs are 

 not strongly marked ; their outlines run obliquely from the last acetabula 

 and curve round to within a short distance of the body margin, remaining 

 fossulae evanescent. 



The peritreme starts a little in front of the second legs ; curving outwards 

 it lies along the margin of the body, and thence turns obliquely inwards 

 reaching a point near the acetabula of the third legs. Genital foramen (fig. 27c y 

 between the fourth acetabula, oblong, slightly flattened at each end ; a pair of 

 strong hairs spring from near its hinder margin. Camerostoma small. Base 

 of tritosternum semicircular, end of filament three-branched. 



Capitulum nearly square, maxillary plate with three pairs of short hairs 

 along the middle line, and a pair of very long hairs on its front margin; 

 outer lobes small. The under side of the first palp segment is swollen into a 

 large rounded prominence which carries at its apex a two segmented process ; 

 the end segment is bilobed, and its inner lobe terminates in four or five 

 curved bristles (fig. 27c?), otherwise the palps are of normal structure. The 

 chelicerae are withdrawn into the body cavity. Armature of legs much as in 

 Gilliba ; there is a small branched hair on the underside of the patella and 

 tibia of the last three pairs of legs. 



Locality. — Found under stones between tide-marks in Howth Harbour, 

 Co. Dublin, towards the end of November. 



Haluropoda n. gen. 



In salt marshes both on the east and west coasts of Ireland there 

 occur two species of the Uropodidae which would appear to be referable 

 to an undescribed genus, intermediate in character between the genera 



M2 



