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The genus is represented in moderate depths in the Caribbean and 

 Andaman Seas 



I. Pylocheles miersii, Alcock and Anderson, Plate I., fig. 2. 



Pylocheles miersii, Alcock and Anderson, Ann. Mag Nat. Hist., January 1899, p. 14. Illus- 

 trations of the Zoology of the Investigator, Crustacea, Plate XLIII, fig. 4. .'Mcock, Investigator 

 Macrura and Anomala, p. 212. 



Carapace cuboidal, its membranous lateral walls being vertical, its ante- 

 rior border faintlv sinuous, its dorsum quite free of setse. 



The abdominal terga 2-5 are separated from their pleura by a groove, 

 and the pleura 2-4 each have a longitudinal crescentic groove. The 6th 

 terc'um is much longer than any of the others. The posterior segment of 

 the telson is obscurely bilobed. There are set^e on the edges of the pleura 

 and on the surface and edges of the telson and caudal svvimmerets, but not 

 on any other part of the abdomen. 



Ophthalmic scales obsolescent : eyestalks half as long as the carapace, 

 a narrow strip along their sides is imperfectly calcified : eyes markedly 

 reniform. 



The 2nd joint of the antennular peduncle is the longest and the 3rd 

 the shortest : the upper antennular flagellum is nearly two-thirds the length 

 of the carapace. The entire length of the antennular peduncle is about 

 two-thirds that of the carapace. 



The inner of the 2 acicles of the 2nd joint of the antennal peduncle 

 reaches more than half-way along the eyestalk, the outer is shorter, both are 

 obscurely serrated : the antennal flageilum is longer than the carapace. 

 The external maxillipeds reach as far as the tip of the eyes. 

 The great chelipeds, which are perfectly equal, are not quite two-thirds 

 the length of the body, nearly half their extent being contributed by the 

 hand. The merus and ischium are smooth, and their common inner surface 

 is marked by an elongate-oval ring of imperfectly calcified integument : the 

 trif^onal carpus has its lower border very short, but its upper surface is three- 

 fourths the length of the palm, is finely rugose, and has its anterior edge 

 produced to form a salient bilobed and finely serrated setose crest : the lower 

 surface of the hand is convex and smooth, but the upper surface is fliat, closely 

 pitted and thickly covered with setse like a mat, and has its edges serrulate : 

 the fingers are not much more than half the length of the palm. 



The 2nd and 3rd pair of legs closely resemble one another, both having 

 smooth compressed joints and ending in a long acute dactylus, which is at 

 least as long as the propodite and longer than the merus : the 2nd pair, which 



