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Key to the. species of Troglopagurus. 



I. Antennal acicle truncate ; anterior edge of ophthalmic scales 



spinulose throughout _ _ _ _ T. mamtarensis. 



II, Antennal acicle not truncated : only the antero-internal angle of 



the ophthalmic scales spinose ; outer surface of left hand 

 covered with a dense mat of hairs : — 



1. Antennal acicle acute : lower border of left hand sinuous T. jousseanmii. 



2. Antennal acicle hardly acute ; lower border of left hand not 



sinuous ___... T. jnbatiis. 



1 Troglopagurus manaarensis, Henderson, Tr. Linn., Soc, Zool., (2) V. 1S93, p. 421, pi. 

 xxxix, fig. 9 1 1 



The Indian Museum possesses no specimens of this species, which was 

 discovered by Mr. E. Thurston in small cavities in coral, in the Gulf of 

 Manaar. 



2. Troglopagurus jousseaumii, Bouvier. Plate V., fig. 6. 



Troglopagurus jousseatimii, Bouvier, Bull. Mus. d'Hist. Nat. Paris, 1897, pp. 231, 232, fig. 6. 



Carapace moderately elongate : region in front of the cervical oroove 

 marked with numerous transverse serrulate and setose ridges. Rostrum 

 almost obsolete, not so prominent as the antennal angles of the carapace. 



Eyestalks moderately slender, not quite as long as the anterior border of 

 the carapace, reaching just beyond the base of the terminal joint of the 

 peduncle of the antennules and rather beyond the middle of the same joint 

 of the antennal peduncle. Ophthalmic scales elongate-triangular, with 3 or 4 

 spines at the antero-internal angle. 



The antennal peduncle hardly reaches half-way along the terminal joint 

 of the antennular peduncle. Antennal acicle acute, not reachincr to the mid- 

 dle of the penultimate joint of the peduncle, its inner edge spinulose : fla^^ellum 

 more than half again as long as the carapace, thickly setose to the tip. 



Left cheiiped vastly more massive than the right, about i J times as lono- 

 as the carapace : the under surface of the merus and the outer surface of the 

 palm and fingers are concealed by a thick coat of long coarse matted hair : 

 the merus has the upper border serrulate and the lower outer border sharply 

 spmose : the upper and the distal borders of the carpus are spinose, and 

 there are a few scattered spines or tubercles on the outer surface also : the 

 palm IS broader than long, its lower border is oblique and makes with that of 

 the fixed finger a sinuous curve ; its upper border, and that of the dactylus, 

 is spinose, its lower border and that of the fixed finger is serrulate or gra- 

 nulous : the outer surface of the hand and fingers is studded with little tuber- 

 cles from which the tufts of long hairs spring. 



