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Distribution : from the Red Sea, Gulf of Aden and east coast of Africa, 

 eastwards to the Sandwich Islands {i.e., from about 40'E. to about i6o°W.), 

 and within these meridians, from about 27°N. (G. Liu Kiu) to about 34'S. 

 (Sydney). 



From Mr. Stanley Gardiner's Maldive collection. 



[1440 Rarotonga (Cook Is.) Purchased.] 



Diogenes, Dana. 



Diogoies, Dana, U. S. Expl. Exp., Crust, pt. 1. 1852, p. 438; Stimpson, Froc. Ac. Nat. Sci. 

 Philad. (1858) 1859, p. 232; Heller, Crust, sudl. Europ., 1863, p. 169: Hasweil, Cat. Austral. 

 Crust, 1882, p, 156: Henderson, P. Roy. Phys. Soc. Edinb. IX. 1885-88, p. 66, and Challenger 

 Anomura, p. 53: Stabbing, Hist. Crust. 1893, p. 160; Ortmann in Bronn's Thier Reich, 

 Malacostraca, p. 1146. 



Carapace usually (but not always) elongate, broadened posteriorly, well 

 calcified in front of the cervical groove and in the neighbourhood of the 

 cardiac region. Rostrum replaced by a movable rostriform process of the 

 ophthalmic somite. 



Abdomen well developed, soft, spirally coiled ; the terga widely 

 separated. 



Eyestalks moderately slender, ophthalmic scales large, separated by the 

 aforesaid movable " rostrum." Antennal acicle well formed : flagellum more 

 or less setose. 



External maxillipeds approximated at base : the exopodites of ail three 

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

 maxilhe has a small recurved flagellum. 



The chelipeds are dissimilar and unequal, the left being greatly the 

 larger : the fingers open and close in an obliquely vertical direction and the 

 finger-tips are acuminate and calcareous. 



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

 at the distal end of the outer surface, there is a patch of imbricating 

 corneous granules, as there is, also, on both rami of the tail-fan. 



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 

 uniramous, in the female the first three are biramous. The telson and other 

 parts of the tail-fan are more developed on the left side than on the right. 



The gills are phyllobranchire, and are 13 in number on either side, dis- 

 posed as in Paguropsis, Pagiiristes, Clibanari7is and Calcinus. 



Diogenes is a characteristic Indo-Pacitic genus, and does not, so far as is 

 known, extend into depths beyond 68 fathoms. 



