TO TXDIAX CAECINOLOGY. 3o9 



G(!iius Xantho, Leach. 



58. Xantho impkessis (Lamarck). 



X. impressus (Lam.), A. Milne-Edwards, Youv. Arch. Mus. Hist. Nat. t. ix. p. 198, pi. vi. fig. 2 (187.3). 



Ceylon, five specimens {NcrUl). 



Dislrib/ffion. Mauritius, Mcrgui, New Caledonia. 



Genus Mld/EL's, Dana. 



59. MeDyEUS uistinguendus (De Haan). 



Cancer {Xantho) f//sfinf/iieiidvs, De Haan, Crust. .Tapon. p. 48, tab. xiii. fig. 7 (1850). 

 Medinix distinyuendiis (Do Haan), De Man, Mergui Crust, p. .31 (1887). 

 Xantho Marf/illivrni/i, Miers, 'Alert' Crust, p. .211, pi. xx. tig. C (1884). 



Gulf of Martahan, two young specimens {Gates). 



I have compared these and found them identical with specimens of similar size from 

 Merg"ui,in the British Musetmi, wliich were referred by Dc Man — and as I think correctly— 

 to De Haan's species. Xantho 3Iac(]Uluyroyi, Miers, from Australia, of which both dry 

 and spirit specimens exist in the British Museum collection, is also in my opinion 

 referable to the same species, the differences being unimportant ; indeed De Haan's figure 

 is a better representation of X. Macfjill'wraijl than is the one given in the Report on the 

 ' Alert' Crustacea. Miers (' Alert' Crust, p. 530) appears to have regarded De Haan's 

 species as a variety of Leptodins exandns (Milne-Edw.). In old specimens the granules 

 on the hands appear to be lost, and simply a rugose appearance is left. 



Distribution. Red Sea, Mergui, China, Japan, N. and N.E. Australia. 



Genus EiTXANTHUS, Dana. 



GO. EuxANTHTJS Melissa (Herbst). 



E. Mclisna (Herbst), A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. i. p. 293 (1865). 



Tuticorin [Thurston); Ceylon {Ilali/, Nerill). 



JJistrilmtion. Erom India to Australia and the Pacific (Eijis, Tongatabii, &c.). 



Genus Zozvjrrs, Milne-Edwards. 



(51. ZozYMUS ^NBUS (Linn.). 



Z. yEiieus (Linu.), Mihic- Edwards, Hist. Nat. Crust, t. i. p. 385 (1834). 



Ceylon {Haly, NecilJ). 



Distribution. Red Sea, Mascarenes, Malay Archipelago, Loo Choo Is., Australia, South 

 Pacific. 



Genus Polvcremnus, Gerstaecker. 



62. i'oLYCREMNis oCHTODES (llerbst). 



Galvne oc/itode.t (Herbst), Adams & White, ' Samarang' Crust, p. 43, tab. x. fig. 2 (1848), 

 Muttuwartu Par {Thurston) ; Madras {J. B. B.). 



52* 



