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XII. Notes upon the Oyxstomatous Crustacea. By Edward J. Miers, F.L.S., F.Z.S., 

 Assistant in the Zoological Department, British Museum. 



(Plates XXXVIII.-XL.) 



Read June 15th, 1876. 



I. Family LEUCOSIIDiE. 



Remarks on the Literature of the Subject. 



SlNCE 1855, when Mr. Bell published, in the 21st volume of the Society's ' Trans- 

 actions,' his excellent monograph of the Leucosiida?, several important memoirs have 

 appeared, adding considerably to our knowledge of the genera and species of this 

 family, which includes some of the most striking and beautiful forms in the whole range 

 of the Brachyura. In the ' Proceedings of the Academy of Natural Sciences of 

 Philadelphia ' for 1858 Mr. "W. Stimpson published diagnoses of several new genera 

 and species of Leucosiidm, collected during the United States' Expedition to the 

 N. Pacific, chiefly in the Chinese seas. In the ' Journal of the Boston Society of 

 Natural History,' vi. 1857, the ' Annals of the Lyceum of Natural History of New York' 

 for 1860 and 1871, and in the ' Bulletin of the Museum of Comparative Zoology,' ii. 

 1870, the above-mentioned author has described a considerable number of new genera 

 and species from different parts of the North- American coast. M. Alph. Milne-Edwards, 

 in the ' Annales de la Societe Entomologique de Erance,' v. 1865, the ' Nouvelles Archives 

 du Museum d'Histoire Naturelle,' x. 1874, and the ' Journal des Museum Godeffroy,' 

 part iv. 1873, has described and beautifully figured many new and interesting genera 

 and species from different parts of the world. Species of this family have also been 

 described or noticed by Gibbes, Herbst, Hess, Kinahan, and others. 



In the present essay the species of this family in the collection of the British Museum 

 which do not appear to have been hitherto recorded, are described ; and remarks are 

 added upon a few other species in the national collection. 



Descriptions of New Species of the Family of Leucosiidse. 



Leucosia, Eabricius. 



The species of this, the typical genus of the family, are remarkable in many instances 

 for the beauty of the coloration and markings of the polished carapace. They are found 

 throughout the tropical and warmer temperate zones of the oriental region, from the Bed 

 Sea to the islands of the Pacific. 



Twenty species are enumerated by Bell in his monograph of the family. Stimpson, in 

 1858, added three species from the Chinese seas to the list. A species from the 

 Australian coast was characterized in 1865 by Hess ; M. Alph. Milne-Edwards in 1874 

 described and figured three species from New Caledonia ; and in 1875 I described one 



SECOND SERIES. — ZOOLOGY, VOL. I. 2 I 



