Clare Island Survey — Acarinida. 39 43 



DESCRIPTION OF PLATES. 

 Plate I. 



Fig. 



1 Eylais discreta Koenike. a, Eye-plate x 115. b, End of fifth palp segment. 



2 Eylais discreta Keen. var. stagnalis Halbt. $ . a, Eye-plate x 115 (lake at 



Westport). b, External genital organ of $ . 

 8 Eylais infundihdifera Koenike. a, Eye-plate x 115. b, Stigma. 



4 Eylais celtica Halbt. Eye- plate x 115. 



5 Eylais relicta sp. nov. a, Eye-plate x 115 (Ballynahinch Lake), b, Eye- 



plate x 115 (Castlebar Lough), c, Capitulum. d, Stigma, e, Palp. 

 /, end of fifth palp segment. 



6 Eylais similis Thon . Eye-plate x 115. 



7 Eylais Koenikei Halbt. a, Eye-plate x 168 (Ardfry). b, Capitulum x 47. 



8 Protzia eximia (Protz). a, Provisional genital area of nymph, b, The 



same of another nymphal form. 



9 Hydrarachna scutata Piersig. Eye-plate of nymph x 47. 



10 Hydrarachna distincta Koenike. a, Eye-plate of $ . b, Eye-plate of 2 . 



c, Genital area of $ (all x 47). 



11 Hydrarachna Thoni Piersig. «-, Eight half of genital area and end of 



fourth epimeron x 47. b, Skin papillae. 



Plate II. 



12 Frontipoda Carpenteri sp. nov. a, Side view, b, Dorsal view of nymph. 



c, Ventral view of nymph, d, Ventral view of genital area, e, Palps. 



13 Atractides brcvipalpis sp. nov. a, Ventral view $ . b, Ventral view of 



capitulum 2 . c, Side view of same x 115. d, Genital area 2 . e, Palp 2 • 



14 Atractides anomalus (C. L. Koch), a, Ventral view of capitulurn. b, Side 



view of same, c, Epirneral region of nymph (all x 115). 



15 Megaptos spinipes var. montanus nov. Terminal segments of first leg x 224. 



16 Megapus spinipes (C. L. Koch). Terminal segments of first leg x 224. 



17 Hygrobates calliger Piersig. Provisional genital area of nymph. 



18 Sperchon brevirostris var. pachy 'dermis Piersig. Palp of female x 115. 



19 Sperchon undidosus Koenike. Provisional genital area of nymph. 



20 Pseudosperchon verrucosus (Protz). Provisional genital area of nymph. 



21 Oxus plantaris Sig. Thor. a, genital area, b, Palp, c, End of first 



epimeron (one of the terminal spines missing). 



22 Oxus oralis [0. F. Muller). End of first epimeron. 



