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transverse grooves or depressions, each of which carry a line of 

 fine hairs, otherwise the pleon is nearly glabrous. The sixth 

 segment tapers a little from near the anterior end, and there 

 are two well-marked projections on the lateral margin; the 

 posterior margin is slightly arcuate. 



The telson is short, about twice as broad as long, it bears 

 on its anterior half a sharp, transverse ridge, notched in the 

 middle, the ends not reaching the lateral margin, the posterior 

 margin is strongly insinuated and devoid of cilia, except one 

 or two long ones near each posterior angle. 



The ocular peduncles are much longer than broad, slightly 

 flattened above, and distally pointed, the inner margins par- 

 allel and close together for nearly their whole length, the outer 

 strongly curved. The eyes are small and subapical. 



The antennules have the first peduncular joint scarcely 

 reaching the end of the ocular peduncle, the second joint is 

 nearly twice as long as the third, the flagella are equal in 

 length and are longer than the peduncle, the lower one is 

 setose, the upper nearly naked, except at its end. 



The antennal peduncle exceeds in length that of the an- 

 tennule, the first joint has the aperture of the green gland pro- 

 jecting, the second joint reaches to the level of the eye, the 

 third joint is small, distinct below, but on its upper surface is 

 a small, circular plate, which may be a rudimentary scale, the 

 fourth joint is long, the fifth joint is about two-thirds the 

 length of the fourth, the flagellum is long, slender, and not 

 setose. 



The external maxillipeds have the ischium and merus 

 expanded, subequal, and together operculiform, their outer sur- 

 faces are fiat for the most part, the line of articulation is 

 curved, both are fringed wath setse on the inner margins, the 

 ischium has a short oblique ridge near its base bearing a few 

 hairs, the apex of the merus is thickened and obliquely trun- 

 cated just behind the articulation of the carpus : the inner sur- 

 face of the two joints has a longitudinal ridge about the 

 middle, bearing on the ischium minute white teeth which are 

 not noticeable on the merus. The next three joints are setose 

 and together longer than the ischium, and merus together : of 

 these the carpus is the longest and is not much expanded be- 

 low, but the propodus is expanded to a large lobe on that side, 

 the terminal joint is compressed, rather broad, and distally 

 rounded and hairy. 



The chelipeds are nearly equal, the ischium is compressed 

 with a faint longitudinal ridge on the outer surface, and one 

 or two small teeth at the distal end of the lower margin, the 

 merus is smooth, slightly longer than the ischium, with a 

 faint, sigmoid ridge on the outer surface. The carpus and 



