229 
narrowly triangular and to a great extent serrated along 
the posterior margin. 
Obisium muscorum Leach (Tab. V, fig. 8—11). Ina 
closed position the 2 fingers almost touch each other 
in the whole length; at the basis the immovable finger 
is very broad and thereupon it decreases very evenly 
and rapidly in breath about the first 2/s of the length. 
The movable finger without galea; serrula free more 
than 1/3 of its length, with very numerous (c. 30) comb- 
teeths, posteriorly narrower than a little outside the 
middle. The immovable finger without lamina exterior, 
and lamina interior (b) formed as a serrula which is free 
in more than !/ of its length and provided with 
numerous (c. 29) comb-teeths. 
Chthonius Ray L. Koch (Tab. V, fig. 12—13). The 
hand uncommonly large and thick compared with the 
shorter fingers which, owing to the curving of the 
movable finger, leave a small space between each other. 
Serrula small, more than half of its length free, with 
ce. 17 comb-teeths, posteriorly narrower than a little 
outside the middle. Lamina interior (b) small, formed 
as a serrula, being free more than half its length, with 
c. 15 comb-teeths. 
In this short description I have only made use of 
the points that are essentially serving my object; a look 
at my drawings will show several other interesting 
differences in »flagellum« (f) et cet. 
H. A System of the Chelonethi. 
Balzan has established (Voy. d. M. E. Simon, p.504—5) 
a system of all described genera. Based on the above 
mentioned structural features and on a couple of other 
characters that do not, I presume, demand any further 
explanation, I shall try to establish a new arrangement, 
