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homologous joints or portions of the limbs in all 
Arthropoda. 
In conclusion let us look upon his interpretation of 
the legs in Chelonethi. He says (op. cit. p. 153) about 
pars tibialis femoris in Obisium that it is »analogue a 
celui des Scorpions«, which, as just mentioned, should 
answer to patella and tibia in Aranece as seen by an 
inspection of his description of this order, but, supported 
by several reasons, I have above proved that pars tibialis 
femoris must answer to the distal part of femur (mero- 
podite) on the hindmost pair of legs in Obisium and on 
the legs in Chelifer, but when it answers to a portion 
of meropodite in Chelifer, I presume that Gaubert will 
admit that it also is answering to a portion of the 
meropodite in the Araneae. Gaubert’s morphological 
study of the limbs of the Arachnids is to a great extent 
wrong in the statement of the homologies, though the 
author expresses himself with great assurance and says 
in the introduction (p. 31) »jai pu résoudre cette ques- 
tions. I shall not here undertake further to discuss this 
great matter and set forth new interpretations, because, 
among others, it would render this treatise double as 
long and require an expanse of time of which I am 
not able to dispose. 
G. The Mandibles. 
The representations of these remarkable organs by 
Stecker, Simon, Gaubert and others are defective, the 
only good one I have found in the literature is that of 
Croneberg (op. cit.). I shall here short exhibit a few 
main types. 
Chelifer granulatus C Koch (Tab. IV. fig. 10 and 
fig. 11). In an adduced position the 2 fingers leave a 
large space between each other, because the anterior 
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