Clare Island Survey — Acarinida. 39 57 



Berlese is of opinion that the mite described by Brady as Gamasu* 

 marinus'is synonymous with the present species, which is probably the case, 

 although the description scarcely contains anything by which one can fix the 

 identity of his species. Practically the only character which would lead one 

 to believe that he had a Halolaelaps before him is furnished by the drawing 

 of one of the leg extremities ; this shows, in side view, an ambulacrum which 

 is suggestive of that of the present genus. 



Distribution. — Evidently a south and west European form, as it has been 

 recorded only from the sea coasts of France and Spain and also of Great 

 Britain. Brady records it as occurring " pretty commonly in crevices of 

 magnesian limestone rocks, between tide-marks, near Sunderland." I have 

 found the species commonly in a very similar habitat at Malahide on the 

 Dublin coast. Firth of Clyde (King in Proc. Roy. Phys. Soc. Edinb. xix, p. 135). 



Halolaelaps celticus sp. nov. (PI. IV, fig, 7a-e.) 



Occurring in a very similar habitat to H. glabriuscxdus is another species 

 which seems to me to belong to the present genus ; it is apparently 

 undescribed. This form resembles H. glabriusculus in the presence of two 

 dorsal shields, and in the arrangement of the plates of the ventral surface. It 

 is, however, a smaller species with stouter and differently armed legs ; the 

 epistome is produced in a long central spine, and the ambulacra, though of 

 very similar structure, are less highly modified ; other differences are also 

 apparent. 



Male (fig. 7a). Length 716^, breadth 409^. Shape much as in 

 11. glabriusculus. The dorsal shields almost cover the upper surface, 

 extremely finely punctured, first shield with a few scattered hairs, second 

 shield with numerous spine-like hairs placed close to the side margins ; the 

 hinder ones have pectinated extremities, and there is a central spatulate hair 

 on the end of the body. Sternum separated by a short interval from the ventro- 

 anal plate, with long processes between the last three pairs of legs ; two strong 

 spines replace the usual fifth pair of hairs on the hinder margin of the 

 sternum. Genital foramen circular, with a short duct. Ventro-anal plate 

 very large, occupying most of the end region of the body, finely punctured 

 with about eight pairs of hairs. Peritreme placed close to the lateral outline 

 of the body, slightly undulate ; stigma in the normal position. 



Capitulum quadrate, with the usual hair armature; maxillary lobes 

 small, curved, and widely separated. Epistome (fig. 7e) produced in a long, 

 spinous, central process, at the base of which there are strong, lateral teeth. 

 Chelicerae (fig. 7c) rather slender ; the free chela has two teeth, the hinder 



