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of the antenna, the flao-ellum of which consists of 15 joints, and reaches outward as far as to 

 the tip of the anterior epibranchial tooth. The antennulae are folded quite transversely beneath 

 the front, separated by a narrow septum, Epistome short, but distinct, transversely deeply 

 folded. Lateral maro-ins of buccal cavity conspicuously convergent backward ; external maxillipeds 

 consequently greatly divergent forward, slender, ischium twice as long as broad, longitudinally 

 sulcate, merus quadrate, with the antero-external angle rectangular, not prominent, exognath 

 slender, not quite half as wide as ischium. 



Chelipeds subequal, of moderate length, granulate at outer surface. Meropodite projecting 

 somewhat beyond carapace, borders shai-pened, but unarmed, except for a triangular, curved 

 tooth near the distal end of the upper margin, which tooth is preceded by a row of long hairs, 

 extending also along the outer border ; carpopodite with a large, flattened tooth as the inner 

 angle, beneath which a tuft of hairs projects, which is continued at either end into a row of 

 shorter hairs ; chela (fig. i a) not much elongate, though more than twice as long as high ; 

 palm iVj times as long as the fingers, finely granulate at both surfaces, with upper and under 

 border rounded, the latter nearly in a straight line with that of the fixed finger; fingers com- 

 pressed, but not keeled ; under finger with a row of short, feathered hairs beneath, continued 

 towards one side to the curved, blunt tip and proximally extending to the palm, cutting margin 

 with a few coarse teeth; movable finger curved, granulate on the back, where a row of feathered 

 hairs, diminishing in length distally, is observed to extend to the tip, proximally these hairs 

 extend to the upper border of the palm, inner margin with some low teeth, interlocking with 

 those of the other finger, one tooth, near the base, being most prominent, blunt and directed 

 backward, at least in the right chela. 



Ambulatory legs slender, elongate, the penultimate pair measuring about 2Y2 times the 

 length of the carapace. Meropodites 6^j^ times as long as broad, narrowing distally, unarmed, 

 but fringed with a few hairs, which on the anterior margin are feathered ; anterior margin of 

 carpopodite and both margins of propodite fringed with long hairs, which are especially long 

 in the case of the posterior legs, in which the propodites are comparatively shorter and more 

 flattened (without, however, assuming the shape of swimming paddles) than in the preceding 

 pairs. Dactyli longer than propodites, not flattened, almost completely straight, though slightly 

 curved at the tip, with four longitudinal rows of hairs, the two marginal rows being the longest; 

 in the last pair of legs the dactyli are perfectly straight, somewhat flattened, with only an inner 

 and an outer series of long hairs, which are feathered, like those of the propodites (fig. i d). 



The abdomen of the cf , Hke the sternum, is granulate ; it is rather thick, not trans- 

 parent, as perhaps we should expect in so small an animal. The first segment (fig. i^) entirely 

 covers the sternum between the last pair of legs : the second segment rapidly narrows distally, 

 so that the last segment of the sternum is visible at either side of this abdominal segment; 

 the third segment again widens laterally, but does not quite reach the bases of the 

 last legs. 



Though, to my mind, there cannot be any doubt about the identity of the "Siboga" 

 specimen with those of the "Alert" expedition, described by Miers, there are a few points put 

 forth by this author, which I cannot confirm. According to Miers, the chelae are pubescent, 



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