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Show 1900.J FROM SINGAPORE AND MALACCA. 721 should like to say that they have been chosen, in nearly every instance, for one of two reasons, apart from those of synonymy : 1st, that the reference given contains a good description, or figure, or useful additional remarks ; 2nd, that the reference points to the occurrence of the species in India or Australia, with the neighbouring seas, or that its existence has been previously noted at Singapore or Malacca. Before proceeding to the account of the species, I should like to take this opportunity of expressing my personal thanks to the following gentlemen, who received us most kindly, and gave us valuable facilities in the pursuit of our object: Sir Alexander Swettenham, C.B., at the time of our visit Acting Governor at Singapore; Dr. R. Hanitsch, Curator of the Baffles Museum, who gave us the free use of a room in tbe Museum, and also useful advice as to collecting-grounds ; Mr. H. N. Bidley, Curator of the Botanical Gardens, to whom I am particularly indebted for the new variety of Potamon tridentatum described below7, and for the brief account of its burrowing habits (which I reproduce from memory); and also to the Hon. W . Egertou, Resident Councillor at Malacca. At home, I have to thank Prof. Jeffrey Bell for the very kind way in which he has placed a room at my disposal in the Natural History Museum, and for kindly communicating this paper to the Society; and Mr. G. A. Boulenger, for very useful advice given in connection with this paper. NOTE.-In the measurements given, the first figures invariably represent the breadth: e.g. 10x7=breadth 10, length 7. All measurements in millimetres. I. Genus ACHCEUS Leach. 1. ACHJEDS LACERTOSUS Stimpson. Achceus lacertosus, Stimpson, Proc. Acad. Nat. Sci. Philad. p. 218 (1857). Achceus brevieeps, Haswell, Proc. Linn. Soc. N.S. W . vol. iv. p. 433 (1879). Achceus lacertosus, Miers, 'Alert' Crust, p. 188 (1384); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 341 (1893). Hab. Singapore ; 6 fms. One male. Dim. 3-5x4. 2. ACHCEUS LORINA Ad. & White. Inachus lorina, Ad. & White, ' Samarang' Crust, p. 3, pi. ii. f. (1848). Hab. Singapore ; 6 fms. Sandy mud. One male. Dim. 5-75 x 7-5. II. Genus CAMPOSCIA Latr. 3. CAMPOSCIA RETUSA Latr. Camposcia retusa, Latr. Regne Animal, 2e ed. t. iv. p. 60 (1829) |