230 COLLECTIONS FEOM MELANESIA. 



smaller specimens from the Arafura Sea, 32-36 fms. (No. 160). In 

 these latter the carapace is more convex and the spines at the pos- 

 tero-lateral angles of the carapace less developed. Although 

 smaller, most of these are adult, since among them are females 

 with ova. 



There are besides in the British-Museum collection a female from 

 the Indian Ocean (Gen. Hardwiclce), several specimens from Hong 

 Kong {Dr. W. A. Ilarland), and others, without definite locality, 

 from the collections of H.M.SS. ' Herald ' and ' Samarang.' 



68. Achelous granulatus (M.-Edw.). (Plate XXIII. 



fig. B, var.) 



A male of this common and widely distributed species is in the 

 collection from Friday Island, Torres Straits, 13 fms. (Xo. 153). An 

 enumeration of the localities whence the Museum possesses speci- 

 mens is given in my Report on the Crustacea collected at Rodriguez 

 by the naturalists of the British Transit-of- Venus Expedition*, to 

 which should be added the following: — Seychelles {Dr. E. Perceval 

 Wright), and Loyalty Islands, Lifu (liev. S. J. Whitmee). It is 

 recorded by Mr. Haswell from Palm Island (as Ampin trite gla- 

 diator). 



A specimen from Prince of Wales Channel, 7 fms. (Xo. 169), 

 differs from all the specimens of A. granulatus that I have examined 

 in wanting the submedian spine of the posterior margin of the arm 

 of the chelipedes (see Plate XXIII. fig. B) ; it may be designated var. 

 unispinosus. The carapace is less granulated and the teeth of the 

 antero-lateral margins less produced and spiniform than is usual in 

 this species, and much less so than in the specimen from Friday 

 Island. 



69. Thalamita admete (Herbst). 



Here are referred a small female from Port Molle, 5-12 fms. 

 (Xo. 118), in the first collection, and another from Port Jackson, 

 5 fms., and five males (adult and young) found on a coral-reef at 

 Clairmont Islands, X.E. coast of Australia (No. 151), in the second 

 collection. 



In the smaller examples of this species the minute rudimentary 

 fourth tooth of the antero-lateral margins is occasionally deficient, 

 as has been noted by A. Milne-Edwards in Thalamita savignyi. 



Specimens are in the British-Museum collection from Conwav 

 Reef (H.M.S. < Herald'), and also from the Fiji Islands (H.MJ3. 

 'Herald'), Samoa Islands (Rev. S. J. Whitmee), and Sandwich 

 Islands ( W. H. Pease). 



I regard the Thalamita savignyi of Prof. A. Milne-Edwards t as 

 probably merely a variety of Th. admete, Herbst. Specimens appa- 

 rently referable to this variety arc in the British-Museum collection 

 from the Gulf of Suez (11. MacAndrew) and Nicol Bay, N.W. Aus- 



* Phil. Trans. clxTiii. p. 488 (1879). 



t Arch, du Mus. d'Hist. Nat. x. p. 357 (1861). 



