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are rendered more conspicuous by a brown pubescence along their borders. Eyes very small. 

 Lateral margins of carapace rather sharp, granulate, especially posteriorly, and separated by 

 a constriction in the middle into two parts, the antero-lateral margins being regularly curved, 

 and the postero-lateral ones straight, divergent backward towards the bases of the penultimate 

 pair of legs. The lateral branchial regions are much declivous and defined dorsally by a longi- 

 tudinal row of granules, parting from the bases of the last pair of legs. Posterior margin of 

 carapace long, somewhat concave at the insertion of the abdomen. 



The very minute antennulae are lying longitudinally beneath the front and do not 

 project beyond its border. The antennae are rather strong, they are lying at the opening of 

 the orbits. The latter are also closed by a minute tooth, situated at the outer wall of the 

 orbit and running across to the front, without reaching the latter '). The basal joint of the 

 antenna is short and thick, inserted beneath the lateral angle of the front, the second joint is 

 long, cylindrical, more than 4 times as long as broad, the third joint is short, scarcely one- 

 fourth of the length of the preceding, the flagellum consists of 5 joints. The two last joints of 

 the peduncle are, like the anterior margin of the front, provided with long, feathered hairs. 

 Pterygostomian regions much depressed, not inflated, smooth and glabrous. Buccal cavity wider 

 than long, lateral margins upturned, concave ; anterior border deeply hollowed, touching the 

 antennulae and antennae, so that an epistome is formed. External maxillipeds broad, parallel 

 to each other ; merus and ischium subequal in length (see Miss Rathbun's figure), with a faint 

 longitudinal groove near outer margin in which long hairs are implanted, well separated by a 

 somewhat angular suture, outer margin of ischium and merus regularly rounded ; palp inserted 

 at antero-internal angle of merus, carpus broadly-oval, disc-like, propodus and dactylus 

 normally shaped, much shorter than carpus, placed end to end, propodus implanted at 

 the centre of the ventral surface of carpus and perpendicular to the latter, 

 dactylus again perpendicular to the propodus, directed backward towards 

 the base of the palp, and parallel to the disc of the carpus"); the whole palp, 

 especially propodus and dactylus densely fringed with long hairs. The exognath is very slender, 

 rod-like, not widening at the base, concealed behind ischium and merus and reaching to the 

 level of the greatest breadth of the latter joint ; its flagellum is very short. 



The chelipeds of all my specimens, even of the largest cf, are exceedingly weak and 

 slender, much shorter than the first pair of walking legs, and about as long as the carapace, 

 but Miss Rathbun states that in the cT the chelae are higher and stronger than in the 9- 

 Upper and outer border of arm and wrist, and both margins of chela fringed with long hairs, 

 the row of hairs along upper margin of chela being double ^) ; palm very low, longer than 

 fingers; the latter acute, very slightly gaping near base and unarmed at the opposite margins, 

 save- a few exceedingly fine crenulations. 



The walking legs are slender, ciliated, and in my specimens the third pair, which is 

 the longest, is as long as, or longer than, twice the length of the carapace, though Alcock 



i) This tooth has been observed aheady by White; Stimpson afterwards sought in vain for it. 



2) This curious conformation of the palp has been already noticed by Stimpso.-i ("palpus spirally twisted"). 



3) In Miss Rathbun's figure of the chela (of the $) it looks, as if the ventral row runs on the outer surface of the chela. 



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