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of dorsal processes similar to those on the anterior division, though a little smaller, 

 the other segments unarmed ; last segment shorter than the preceding one. Caudal 

 rami slender and narrow, though not attaining the length of the 3 preceding 

 segments combined, each with 2 successive bristles on the outer edge, middle 

 apical seta rather strong, about the length of the urosome, including the caudal 

 rami. Anterior antennse comparatively slender, attaining the length of the cephalic 

 segment, 1st joint much produced, occupying half the length of the whole antenna, 

 2nd joint small and imperfectly defined from the 3rd, terminal joint about the 

 length of these joints combined. Posterior antennse very slender, distal joint 

 fully as long as the proximal one, and exhibiting near the end posteriorly 2 

 successive dentiform projections, spines of anterior edge unusually slender. Mandi- 

 bular palp somewhat more fully developed than in the other species of this family, 

 though uniarticulate. Posterior maxillipeds of moderate size, hand narrow oblong 

 in form, dactylus slender and gently curved. 1st pair of legs with the inner ramus 

 about the length of the outer, distal joint the longer and tipped with 2 very 

 slender setse, outer ramus with the spine of the proximal joint very long and 

 narrow, distal joint armed with 2 slender spines and 3 still more slender curved 

 setse. Inner ramus of the 2 succeeding pairs consisting of a single very small 

 joint tipped with a long seta and a small hair-like bristle; that of 4th pair quite 

 rudimentary; outer ramus in these pairs with the spines unusually long and slender, 

 middle joint with a seta inside, terminal joint in 2nd and 4th pairs with a similar 

 seta, in 3rd pair with 2 such seta?. Last pair of legs forming each a simple, 

 slightly curved, biarticulate stem projecting from each side of the last segment of 

 the anterior division, and tipped with 3 subequal setse, proximal joint shorter 

 than the distal one, and provided on either side with a slender bristle. 



Male unknown. 



Colour not yet ascertained. 



Length of the specimen examined 0.54 mm. 



Remarks. This form also exhibits a most extraordinary appearance, 

 owing to the peculiar pectinate processes arising from the dorsal face of the body, 

 a character which indeed has given rise both to the generic and specific names 

 here proposed. 



Occurrence. A single female specimen of this remarkable form was found 

 in a sample taken at Flekkero, south coast of Norway, from a depth of about 

 12 fathoms, muddy bottom. 



