THE AXNA.LS AND MAGAZINE OF NATURAL HISTORY. [SEVENTH SERIES.] No. 33. SEPTEMBER 1900. XXXIV. — On some Malacostracous Crustaceans from Ma-laysia in the Collection of the Sarawak Museum. By W. F. LA.NCHESTER, M.A., King's College, Cambridge. [Plate XII.] The Crustaceans with which I deal in this paper were sent to me by Mr. R. Shelford, B.A., Curator of the Sarawak Museum, when I was at Singapore in the early part of 1899, and I am greatly indebted to him for giving me the oppor-tunity of identifying them. He has, further, been kind enough to let me retain all but two of the specimens, and those that may be desiderata to the Natural History Museum at South Kensington will be deposited there. It is a small collection of 38 species (27 genera), and only one of these is new ; but some, in particular the Potamons, of which there are five species, have only been recently described. This Potamon group, which seems to be especially well represented in Borneo, and which ranges there from sea-level to 6000 feet, numbers many species of more or less definiteness, and greater additions to our collections will no doubt enable us to reduce the number of these somewhat and at the same time to get a clearer idea of their mutual affinities. There is also a specimen of a Callianassa, unfortunately somewhat damaged, but almost certainly identical with C. Martensi, Ann. & Mag. N. Hist. Ser. 7. Vol. vi. 17
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