30 A NEW FRESH-WATER CRUSTACEAN. 
Explanation of the figurks. 
A. Dorsal view of M. macrowus, n. sp. 
B. Mandible " " " 
C. " " Jf . 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. macrourtis. 
I. " " " •' " '• " M. brachyurus. 
J. Caudal appendage of M. macrourus. 
K. " " ^' M. brachyurus. 
