149 
this fact; if there were any close relation between the two orders 
it might perhaps be convincing, but their relationship has not yet 
been proved. I prefer to follow Drs. Hansen and Sørensen in 
their terminology, though with some hesitation, as such an eminent 
author as Michael (10 pag..116) calls them. mandibles. 
They lie along (pl. IV fig. 4 and 5, pl. VI fig. 6) the labrum 
and are articulated under the ,,rostrum”; they consist of three joints 
(fig. 10) as usual in many Acari f. inst. the Gamasidae,. and are 
placed near together with the exception of the distal ends which 
are more removed from each other. They are somewhat compressed. 
The basal joint (fig. 4,1) which is shorter than the second and almost 
cylindric, is bent slightly inwards on the ventral side. It is pro- 
vided with a single pointed inner hair near to the front and dorsal 
margin at the. base of the second joint. The second joint is some- 
what longer than the first one and articulated into a cavity of the 
latter, it forms the upper finger 'of the chela, the lower margin 
being bent upwards where the third joint is articulated, forming a 
terminal hook with the upper margin. It is provided. with two 
dorsal hairs, a longer more distal one, and a shorter, more proximal 
one besides an inner hair near the dorsal margin between the two 
mentioned. The upper finger has at least one tooth behind the hook. 
The third joint (fig. 4. 3) or lower finger of the chela is articulated 
with a very well developed hinge-joint within a cavity of the second one; 
it is terminated with a strong upwardly directed hook, behind this 
there is a large tooth, sometimes several small teeth. The third 
joint of the antennae. is moved by strong muscles. The adductors 
(fig. 10 c) are fastened to a strong tendon going from the upper 
corner of this joint into the first joint, where it is divided into 
several branches. The muscles connected with this tendon are espe- 
cially fastened to the upper walls of the two first joints. The few 
abductors (fig. 10 d) are connected with a short tendon arising from 
the lower. corner. 
