126 Proceedings of the Ro//al Irish Academtj. 



Ex genus Lasiaseius. Pili trunci plus miuusue penicillate, vel dilatati. 

 Typus Z. Z. sj>aihuligcr Leon " (16, p. 43). 



3Iak (fig. 8a): Length, of a Swanage specimen, about 768/u, breadth 

 537^ ; of a ilalahide specimen 614/i. breadth -ilGfi ; the latter is probably 

 not mature. Colour pale brown. Shape ovate, slightly flattened on end 

 margin ; sides indistinctly serrated. Dorsal surface minutely punctured, and 

 with reticulate markings, becoming scale-like towards the end of the body 

 On each side of the doi-sum there is a row of seven strong marginal spines ; 

 these (fig. 8b) are straight and smooth, except at the extremities, which are 

 somewhat flattened and penicillate. There are two pairs of stout frontal 

 spines ; two rows of minute hairs in the middle line of the body, and a few 

 on the side margins. The ventral shield (fig. 8c) is V-shaped, with strongly 

 pointed side processes, and bow-shaped front inai^n, and there are four 

 pairs of minute liairs. Peritreme long and sinuate ; apex reaching fourth 

 acetabula ; no shield. Anal plate small, semicircular in front, and suddenly 

 narrowed to an obtusely pointeti extremity, where there is a strong terminal 

 spine. 



Epistonie armed with comparatively long spines, branched at the 

 extremities; maxillar)- plate large and transverse ; lobes small ; tliere are three 

 pairs of rather long hair on the front margin (fig. 8d). Palps of moderate 

 size, with two strong conical teeth on underside of first segment; second 

 segment with five short spines, three of which are on the dorsal surface. 



Legs, with the exception of llie first pair, long and robnsl ; tlieir upper 

 sides carry penicillate hairs like those of the dorsum ; llie ventral hairs are 

 long and pointed. Ambulacra stout, with two teiminal liairs of moderate 

 length. Free chelicerae. amietl with a short process, whicli readies a little 

 beyond the end of the segment, seen in their natural position from alwve, 

 the pnx^esses are straight, directed outwards, and ate bhuitly pointed. (The 

 chelicerae of the unique Irish specimen have not been dissected.) Female 

 unknown. 



Habitat. — Some years ago Mr. A. I), ilichael kindly sent me a few 

 littoral mites which he found on the south-west coast of England. One of 

 these, from the shore at Sw&nage. is referable to the present species. In 

 July, 191o, I fouod. a male, apparently not quite mature, under seaweeds 

 washed into the Orange Lichen zone at Malahidc. The weeds were in a moist 

 decaying condition, and were lasting on the bare limestone rocks. 



ThinoseiTU gen. nov. 



(Fetttalr). A form Wonging to the family Laelaptidae ; general structure 

 resembling tliat of the genus Lasioseius, but in the adult the body is enclosed 



