Puate VIII 
Fig. 1. Usual habitat of Upogebia furcata (Aurivillius), at Banana. 
‘‘A tough, peat-like mass of minute rootlets, often several feet in thickness, is formed by man- 
groves, Rhizophora mangle Linneeus, in sandy places where anchorage can not be gained in any other 
way. The large holes are made chiefly by the beautiful blue crab, Sarmatium curvatum (H. Milne 
Edwards), and usually extend a few inches deeper than the level of the lowest tide. Here this is the most 
common crab, whereas in typical, muddy mangrove swamps several kinds are equally abundant; the 
smaller holes are the exits to long tunnels made by a whitish, thalassinid crustacean about an inch in 
ue ee furcata (Aurivillius). Young eels and a few other creatures also use the tunnels as 
refuges.”’ wLis)s 
Fig. 2. Upogebia furcata (Aurivillius). Left, male; right, female, X1 %. 
