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from the rest ; posterior and lateral portions of the carapax coarsely 

 punctate and unarmed. Peduncle of the antennula armed above -with 

 small spines; inner flagellum stout, nearly as long as the carapax; 

 outer flagellum much less stout and not more than half as long as the 

 inner. Peduncle of the antenna smooth and unarmed ; antennal scale 

 reaching a little beyond the peduncle, the outer margin thickened, 

 concave in outline, and armed with a very strong spine; flagellum 

 very stout and nearly twice as long as the carapax. Legs of the firat 

 and second pairs about equal in size and very similar to those of the 

 the species of Atya just described, but all the segments more or less 

 hairy. Legs of the third pair greatly developed, even in the very 

 young, the two when placed together, side by side, being thicker than 

 the carapax; basis and ischium tuberculose and hairy beneath; merus 

 long and very stout, rounded without and flattened on the inner side, 

 the whole outer surface thickly beset with prominent, squamiform 

 tubercles, which show a tendency to an arrangement in longitudinal 

 lines, most of the tubercles giving rise at their bases to little tufts of 

 pubescence, the flattened inner surface unarmed, but densely hairy 

 along the lower edge ; carpus nearly as broad as long, the upper 

 surface tuberculose like the merus, but the tubercles rather larger and 

 more crowded together, the inner and under surface densely hair y ; 

 propodus very short, being broader than long, the outer surface Avith 

 close set, large tubercles like those on the distal end of the propodus, 

 the inner and under surface densely hairy ; dactylus forming a stout, 

 cylindrical, horny claw, longer than the propodus, and curved strongly 

 downward. Legs of the fourth pair very much more slender, not 

 reaching, by considerable, the distal extremity of the merus of the 

 third pair, hairy along the inner side, and thickly beset with small 

 squamiform tubercles, which increase in prominence distally and 

 become slender spines at the extremity of the propodus ; propodus 

 cylindrical and longer than the carpus ; dactylus small, composed of a 

 thickened basal portion and a slender terminal claw, and unarmed 

 except a few minute spines on the under side of the basal portion. 

 Legs of the fifth pair like those of the fourth, but smaller, and the 

 propodi proportionately longer. Dorsal surface of the abdomen 

 evenly convex, naked, and closely punctate ; first and second segments 

 with a strong lateral, submarginal carina, which is specially prominent 

 on the lateral expansions of the second ; third to sixth segment with 

 the posterior lateral angles produced into conical points or spines. 

 Appendages of the sixth segment with a stout spine above the artic- 

 ulation of each lamella; lamella? very broad and slightly pubescent 

 above. Terminal segment, at base, nearly as broad as long, and 

 tapering rapidly to a truncate and spined extremity ; upper surface 

 with a median sulcus toward the extremity, armed, on either side, 



