315 



in the middle a deep transverse depression partly covered by 2 peculiar horn-like 

 hairy processes arising from the anterior part of the segment and curving abruptly 

 backwards; posterior part of the dorsal face armed with 2 small juxtaposed 

 prominences. Rostrum very small, terminating in 2 juxtaposed knob-like promi- 

 nences, each tipped with a delicate hair. The 4 succeeding segments without 

 any lateral projections, but each armed with a pair of simple erect dorsal pro- 

 cesses. Urosome rather narrow and shorter than the anterior division, anterior 

 part of genital segment unarmed, posterior part, as also the succeeding segment, 

 armed with 2 rather large and closely juxtaposed dorsal processes curving gently 

 backwards. Last caudal segment about the size of the preceding one, anal opercle 

 smooth. Caudal rami rather produced, exceeding in length the last 3 segments 

 combined, and somewhat bent in the middle, where each carries outside a 

 thin bristle, and somewhat dorsally another much larger bristle arising from 

 a knob-like prominence ; middle apical seta scarcely longer than the ramus itself. 

 Anterior antennae rather slender, being about the length of the cephalic segment, 

 1st and 3rd joints of nearly equal length, 2nd joint much shorter, terminal joint 

 very narrow and not quite the length of the preceding joint. Posterior an- 

 tennas with the distal joint shorter than the proximal one. Posterior maxillipeds 

 with the hand oblong oval in form, dactylus of moderate length and slightly curved 

 in its outer part. 1st pair of legs resembling in structure the 3 succeeding pairs, 

 but of somewhat smaller size, outer ramus triarticulate, though the boundary 

 between the 2 last joints appears somewhat less sharply marked, middle joint 

 without any seta inside, terminal joint with a slender spine and 3 still more 

 slender geniculate setee; inner ramus, as in the 3 succeeding pairs, quite rudi- 

 mentary, with a single small seta on the tip. Outer ramus in these pairs well 

 developed, with a seta inside the middle joint, terminal joint in all pairs smooth 

 inside. Last pair of legs comparatively small, distal joint narrow linear, with 4 

 unequal seta?, inner edge smooth; proximal joint with a small bristle inside, but 

 not forming any distinct expansion, digitiform process exceedingly long and narrow. 

 Male unknown. 



I Body of whitish colour, with a yellowish tinge. 



Length of adult female 0.76 mm. 

 Remarks. This is the only species of the genus as yet known, and it may 

 be easily recognised by the peculiar and very conspicuous armature of the body. 

 I have much pleasure in dedicating this extraordinary form to the well known 

 distinguished naturalist, Canon A. M. Norman, to whom we are indebted for so 

 many important contributions in nearly all branches of Zoology. 



