( 74 ) 



In the remarkably elongate eyestalk and abbreviated antennal peduncle 

 this species resembles D.pallescens, Whitelegge, from Funafuti Atoll. 



Besides the 13 species and varieties here described, there is m the 

 Museum collection a small and damaged specimen from Mergui which does 

 not seem different from the Atlantic and Mediterranean (and Red Sea) 

 Diogenes pugilator, Roux. Nobili has recorded this species from Singapore. 



Troglopagurus, Henderson 



Troglopagurus, Henderson, Trans. Linn., Soc, Zool., (2) V, 1893, p. 421. 



Carapace elongate, broadened posteriorly, well calcified in front of the 

 cervical groove and in the neighbourhood of the cardiac region. Rostrum 

 obsolescent. 



Abdomen well developed, soft, spirally coiled ; the terga indistinct and 

 widely separated. 



Eyestaiks moderately slender, ophthalmic scales large, rather slender, 

 approximated. Antennal acicle short, robust : flagellum setose. 



External maxillipeds fairly well approximated at base : the exopodites of 

 all three pairs of maxillipeds are flagellate : the endopodite (palp) of the ist 

 pair of maxillae non-flagellate. 



Chelipeds dissimilar and unequal, the left being greatly the larger: the 

 hands are tomentose, the fingers open and close in a nearly vertical plane, 

 and the finger-tips are calcareous and acuminate. 



The 4th pair of legs are subchelate. and the 5th pair chelate : in both 

 distally, on the outer surface, is the usual pavement of imbricating granules, 

 as there is also on both rami of the caudal appendages. 



The abdominal appendages, in addition to those that form the tail-fan, 

 are 4 in number (somites 2 — 5) and are placed on the left side : in the male 

 they are small and uniramous ; in the female they are large, and the first 3 

 are biramous. The caudal appendages are better developed on the left side 

 than on the right. 



The gills are phyllobranchife, and are 13 in number on either side, 

 disposed as in Paf;uropsis, Pa^nristes,Calcinns, Clibanarms, and Diogenes 



Troglcpagurus, as far as is known, is restricted to Oriental seas between 

 the Gulf of Aden and Singapore. Of the three known species one is said to 

 inhabit crevices in coral, and another lives in broad-mouthed shells which in 

 many cases are far too big (relatively to the size of the animal) to be 

 portable. 



