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margin of the hand is broad, and the movable finger is 
inserted in the one end, while the immovable finger is 
comparatively narrow at the basis and issues far from 
this insertion. The movable finger has close to its distal 
end a »galea« (g), branched at the apex, on the side 
that is turned towards the median plane of the animal 
and slightly removed from the interior margin a »ser- 
rula« (s), grown fast the whole length and furnished 
with c. 16 comb-teeths, the hindmost being the longest. 
The immovable finger carries along almost the whole 
exterior margin a smaller, thin, half transparent plate, 
lamina exterior (a), on the interior side a broad, large 
plate of the same kind, lamina interior (b), being in 
front peculiarly lobated and dentated. 
Olpium furciliferum Baiz. (Tab. V, fig. 2—4). The 
space between the fingers, when closed, smaller than 
in Chelifer. The movable finger with galea; serrula 
(fig. 4) grown .fast the whole length, with numerous 
(c. 27) comb-teeths, posteriorly a little broader 
than anteriorly. The immovable finger with a well 
developed lamina exterior (fig. 3); lamina interior has 
become narrower than in Chelifer, in the full length 
with commencing transverse partitions from the free 
margin towards the basis, so much as to render the 
margin posteriorly crenated 
Ideobisium crassimanum Balz. (Tab. V, fig. 5 7). 
The distance between the closed fingers a little smaller 
than in Olpium, as the immovable finger becomes very 
broad towards the basis. The movable finger with 
galea; serrula free in the anterior end, with numerous 
(c. 23) comb-teeths, being narrower at the basis 
than outside the middle. The immovable finger 
(fig. 6) without lamina exterior; lamina interior 
transformed as a serrula, being free at the distal end 
and having numerous (c. 21) coisb-teeths, which are 
