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Show 1877-] ON CRUSTACEA FROM SOUTH AMERICA. 653 9. On a Collection of Crustacea, Decapoda and Isopoda, chiefly from South America, with descriptions of new Genera and Species. By E D W A R D J. MIERS, F.L.S., F.Z.S., Assistant in the Zoological Department, British Museum. [Received June 13, 1877.] (Plates LXVI.-LXIX.) The greater number of the Crustacea described in the following paper were collected in Peru, Guiana, Cayenne and Martinique, and were sent by Professor A. Wrzesniowsky, of the University of Warsaw, to Dr. Gunther, by whom they were intrusted to me for determination and description. The collection contained also a few Old-World species from various localities, which are described separately at the end of the paper. I have also added descriptions of species belonging to the same genera in the collection of the British Museum, which have hitherto been unrecorded, or known only from names without descriptions applied to them by A. White, in the ' List of Crustacea of the British Museum,' 1847. In all, 37 species are noticed, of which 27 are from the New, and 10 from the Old World, viz. Brachyura 5 species, Anomura 7, Macrura 5, Isopoda 20. Of these 22 appear to have been hitherto undescribed, viz. Brachyura 1 species, Anomura 6, Macrura 2, Isopoda 13. I have carefully noted such variations as I have observed between individuals of the same species-the nomenclature having often been needlessly encumbered by the description of nominal species, based only upon sexual or other differences, which the examination of a good series of specimens would have shown to be insufficient. I have also endeavoured to compare the species described with their allies, although in the case of the terrestrial and fluviatile Decapoda and terrestrial Isopoda this has generally been attempted only as far as their congeners inhabiting the same continent are concerned. Many, indeed, of the European Isopoda are only known to me by descriptions so short and superficial as to render their determination a matter of great difficulty, and their comparison with the New-World species described in the following paper impossible. LIST OF THE SPECIES DESCRIBED. The names of the species in the collection from Warsaw are in Roman type, those described from specimens in the collection of the British Museum are in italics. New-world Species. DECAPODA. BRACHYURA. Acanthonyx petiverii, M.-Edw. ? Peru. Hepatus chilensis, M.-Edw. Peru. Neptunus anceps, Saussure. Marti- tuberculatus, Saussure (adult). nique. W. Indies, Cayenne. PROC. ZOOL. Soc-1877, No. XLIII. 43 |