[61] DECAPODA FROM ALBATROSS DREDGINGS. 405 



The eye-stalks are slender, vertically compressed, with a slight prom- 

 iueiice (much more conspicuous in very small specimens than in adults) 

 near the middle of the inner edge, do not reach the second segment of 

 the antennula, and. bear the small, slightly- swollen, minutely faceted, 

 and nearly black eyes, facing obliquely inward and forward. 



The antennuke do not difl'er noticeably in the two sexes. The pedun- 

 cle is very much shorter than the antennal scale. The body of the 

 first segment is about half the entire length, strongly compressed 

 vertically, but not much excavated above, and armed with a long, slen- 

 der, and acute lateral process extending forward to the ultimate seg- 

 ment. The second segment is longer than br-oad and subcylindrical. 

 The ultimate segment is smaller than the second and bears the upper 

 flagellum about the middle of its dorsal surface, and the lower flagellum 

 at its tip. The lower flagellum is slender, subcylindrical, and about 

 three times as long as the carapax, excluding* the rostrum. The upper 

 flagellum is about as long as the proximal segment of the peduncle, 

 compressed vertically, a little broader than the lower, and clothed be- 

 low with short hairs, but naked and very smooth above. The second 

 segment of the peduncle of the antenna is armed with a stout, spiniform 

 curved process just inside the base of the scale ; but the peduncle is 

 otherwise wholly unarmed. The ultimate segment is nearly as long as 

 the eye-stalk. The antennal scale is more than half as long as the car- 

 apax, exclusive of the rostrum, a little less than half as broad as long, , 

 the inuer margin and the tip broadly rounded in outline and ciliated, 

 the outer margin thickened, rod-like, and terminating in a short spine 

 a considerable distance from the tip, but the rest of the scale is unusu- 

 ally thin and membranaceous. The flagellum is considerably longer 

 than the lower flagellum of the antennula, about as stout, somewhat 

 flattened vertically, smooth, and nearly naked. 



The labrum is triangular, soft, fleshy, and very prominent ventrally, 

 The lobes of the metastome are very large, covering the whole of the 

 posterior surfaces of the crowns of the mandibles. The mandibles (Plate 

 IX, Fig. 2) are almost exactly alike. The opposing surfaces of the 

 crowus are triangular in outline, the posterior edge is sharp, continuous, 

 and terminates ventrally in a triangular tip, between which and the 

 irregular and slightly prominent molar area there is a broad and shallow 

 <iepression. The proximal of the two segments of the palpus is about 

 three times as long as broad, reaches slightly by the tip of the crown 

 and expands a little distally ; the distal segment is little more than half 

 as long as the i^roximal, expands on the inner edge near the base in a 

 triangular i^rominence, beyond which it is suddenly contracted, and 

 terminates in an obtuse tip ; the anterioi" surface of both segments is 

 convex, smooth, and naked, the posterior surface thickly clothed with 

 short hair. 



The proximal lobe of the protognath of the first maxilla (Fig. 3) is 

 small and obtusely ovate at the tip, the distal twice as broad and its 



