25 



M. armafa : posterior border with three sharp denticles of equal size — one at 

 either end, one in the middle. 



Pterygostomian regions channelled as usual, the surface outside the channels 

 hairy. 



Inner border of ischium of external maxillipeds deeply cut into elegantly- 

 rounded, specially calcified teeth. 



Chelipeds perfectly equal, the exposed outer surfaces closely covered with 

 sharp granules and acutely-conical tubercles. Transverse crest at the far end 

 of the arm with four spines, the outermost of which is the largest, but is of no 

 great size. The only crest on the hand is that of the 8 or 9-toothed upper 

 border. 



Legs almost as in the preceding species, but shorter — the first three pair 

 being hardly as long as the chelipeds — and having the dorsal surfaces of the 

 meropodite and carpus more granular. 



The second abdominal tergum has a very prominent transverse three-lobed 

 carina, as in the preceding species. 



A single adult male, from off the Maldives, 210 fathoms, has the carapace 

 48 millim. long and 60 milUm. broad, and the lateral epibranchial spine 3 millim. 

 long. 



The specimen on which this species is founded was received during my 

 absence in England, and was accidentally put away among the general collection, 

 where it escaped notice until after the printing of this report was considerably 

 advanced. 



Family Leiicoslidce. 



Randallia, Stimpson. 



Randallia, Stimpson, Jonrn. Boston See. Nat. Hist. Vol. VI. 1857, p. 471 : Miers, Challenger Brachynra, 

 p. 316: Alcock, J. A. S. B. Vol. LXV. pt. 2, 1896, p 191. 



Carapace circular and convex, almost globular ; with the front narrow, 

 usually broadly bidentate, and somewhat sunk behind the level of the front edge 

 of the buccal cavern. The subhepatic or pterygostomian regions are convex and 

 puffed out, so as to increase the squat and sunken appearance of the front. 

 There is a remarkably broad vertical interval between the orbits and the edge 

 of the buccal cavern. 



The surface of the carapace is, typically, covered with vesicular or pustu- 

 lous granules, but these are sometimes visible only with a lens : the regions are 

 usually, but not always, distinctly demarcated by grooves. 



The posterior margin is generally, but not always, armed with spines or 

 petaloid lobules or tubercles. 



