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Show 310 MR. G. S. BRADY ON BRITISH MARINE MITES. [Apr. 6, The foregoing description (though not copied verbatim) comprises all the more important particulars noted by M r . Gosse; and, allowing considerable margin for individual variation, it applies perfectly well to such examples of the species as have come under m y notice. Mr. Gosse found it not uncommon among seaweeds from low-water mark at Weymouth; Mr. Hodge dredged it in a depth of 20 fathoms off the Durham coast; I have myself taken it abundantly in pools of brackish water at the side of the Burn, Seaton Sluice, Northumberland, and have also found it in great numbers in almost all dredgings from the coasts of Durham and Yorkshire, as well as in the Frith of Clyde. It is with no little regret that I feel quite unable to draw any specific distinction between the forms described by m y old friend Mr. Hodge (H. granulatus and H. oculatus) and the prior species H. rhodostigma, Gosse. H. oculatus is, I think, without doubt only the young ; and, excepting some trivial distinction of surface-markings, I cannot find out on what Mr. Hodge relied to distinguish his supposed species. HALACARUS CTENOPUS, Gosse, loc. cit. pl. 3. figs. 6-10. Body smooth, granulated, divided below only; length ^ of an inch ; colour variable, dark red or yellowish brown, often with a white line down the centre; nearly oval, pointed in front, excavated at the insertions of the legs; transversely sulcate beneath, opposite the origin of the third pair of legs. The rostrum is more attenuated than in H. rhodostigma; but the palpi are stouter, the last joint being a short hook, and both it and the preceding joint bear a small spine upon the inner margin. The legs are of nearly equal length ; thighs remote (laterally), those of the first two pairs and last two pairs of each side respectively originating close together; the joints diminish gradually in length and width to the last, which bears two falcate claws: each of these has an accessory piece near the extremity of the convex margin, and is strongly pectinated along the conave edge. Eyes two, large, situated near the base of the second pair of legs, and one much smaller near the base of the bulb of the rostrum. The feet of the first pair are often armed on the middle of the inner edge of the third, fourth, and fifth joints (or one or more of them) with a single stout spine ; but this is very variable, as also is the length and strength of the setiferous armature in general. Mr. Gosse described this species from one specimen found in company with the foregoing. It seems, however, to be of common occurrence, and generally distributed round the British coast. I have taken it on weeds between tide-marks and a little below low-water mark at Cullercoats (Northumberland), Westport and Bir-terbuy Bays (Ireland), Little Cumbrae (Frith of Clyde), Isles of Aran (Galway Bay), and amongst the Scilly Islands ; M r . Robertson and myself have also dredged it in depths of 7-29 fathoms off Portin-cross (Ayrshire), in 20-35 fathoms off Red Cliff, Yorkshire, and in 10-12 fathoms off the Scilly Islands. Mr. Norman savs it is |