the abdomen is generally somewhat broader. The terminal segment is as long as broad at 

 the base (in H. latreitti longer), the length of the penultimate segment is two-thirds of its 

 width at the base (four-fifths in //. latreilli, so that in this species the segment is longer), 

 the two preceding segments are alike in length and shorter than the sixth segment. As far as 

 can be judged from Dana's figure of the abdomen, it agrees with my drawing. 



Contrary to vvhat is found in H. latreilli the chelipeds are wholly equal in size ; 

 although the meropodite wholly agrees with that of this species, the place of the musical crest 

 is different: it is found quite anteriorly, where the roughly granulate inner or anterior margin 

 curves inward towards the wrist and, though small, it is conspicuous by a deeply-brown colour. 

 Upper surface of wrist very minutely granulate and defined inward by a longitudinal row of 

 somewhat lareer eranules; at the inner angle a small tooth is found, that is foliowed backward 

 by a longitudinal row af 6 — 7 teeth, which successively decrease in size. 



The chelae are inflated; the height of the palm is nearly equal to the length of the movable 

 finger; the outer surface is minutely granular, with pits of somewhat larger size; in the ventral 

 half there is, near to the articulation with the wrist, a very short, longitudinal row of granules, 

 that is continuecl indistinctly towards the hngers by some punctae, hut the row is different 

 from the more or less prominent carina on the chela of//, leachi. Near the articulation 

 with the wrist a tuft of short hairs is observed, and a row ofsimilar hairs 

 is found at the opposite margin of the wrist: the upper border of the palm is 

 keeled in its proximal third and accompanied by a row of hairs, but rounded distally ; the 

 whole margin is roughly granulate and bordered towards the outer surface by a continuous 

 row of very minute granules, that are again defined externally by a row of short hairs; the 

 inner surface is slightly granular, and at the proximal under angle a rounded lobe 

 p r o j e c t s f r e e 1 y and is roughly eren u late at the convex margin. The fingers 

 are short, nearly wholly straight, not flattened, acuminate at the horny tips, not gaping, and 

 provided at the inner margins with 4 — 5 crenulations in the case of the movable finger, and 

 with a few more on the opposite margin; externally we find a very small patch of 

 short hairs between the bases of the fingers, which hairs also ex t end to 

 the movable finger; as is well known this patch is much larger in H. leachi and even 

 induced A. Milne-Edwards to name this species H. pilimana. 



The shape of the walking legs presents nothing remarkable, except that the meropo- 

 dites (that are three times as long as broad) are armed anteriorly with a ree tang ui ar 

 prominence, which, like the distal margin of the meropodite, is shortly hirsute ; in H. leachi 

 and H. latreilli the meropodites are unarmed, in H. tridens they present a more or less 

 acute spine. The dactyli are as long as the propodites, somewhat curved, compressed, and 

 provided with some rows of hairs. Carpo- and propodite of the first to third pair of ambulatory 

 legs are clothed with a more or less continuous very short fur on the anterior margin and 

 upper and under surface; this clothing is reduced gradually towards the hind. pair of legs, 

 which is nearly naked; the hind margins of mero-, carpo- and propodite show some long and 

 scattered hairs. Dana says, that the 5 th joint of the first pair of walking legs is tomentose 

 above and on anterior surface, but not below, which does not agree with my finds. 



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