30 A NEW FRESH-WATER CRUSTACEAN. 



EXPLANATION OP THE FIGURES. 



A. Dorsal view of M. macrourus, n. sp. 



B. Mandible " " " 



C. " " M. brachyurus. 



D. Outline of one side of head of M. macrourus. 



E. " " " " " " M. brachyurus. 



F. Hand of M. macrourus. 



G. " " brachyurus. 



H. One of second genital plates of male M. macrourus. 



I- " " " " " " " M. brachyurus. 



J. Caudal appendage of M. macrourus. 



K. " " " M. brachyurus. 



