152 
Chiridium has an undivided femur; Chtonius hås the distal part so 
very well developed that. all arachnologs before Hansen have 
regarded it as the real tibia. The same development may beé followed 
in the Prostigmata: from a genus as Notophallus to Ryncholophus. 
I do not at all know if this character will get any systematical value 
here as in the Chelonethi, it will, however, ' be necessary to take it 
into considération when dealing with the homology of the joints. 
B. Legs in Eucarus (pl. IV ie, 13 LV fig, 1-6), 
The legs of the Wotostigmata are very singular, They resemble 
the legs of Linopodes as the first påir ig mugh thinner and longer 
than the other and probably used as feelers; the fourth pair is 
stronger than the second and third. Leg I and II åre directed 
forwards, the two last pair are directed backwards. Though there 
is, great differenee between the first and the three last pairs of legs, 
it is: easy to show that they are shaped after the same form. They 
consist: (pl. V fig, 1—5) of a coxa, trochanter (a) (one or two), 
Femur (b), patella (c) (I call this joint patella on account of its 
position between the femur and the tibia), tibia (d), meétatarsus (e) 
and tarsus (f). The tarsus is sometimes by a circular groove divided 
into two parts and terminated with a claw-joint, 
All the coxae (pl. IV fig. 3) are small round movable joints; 
the first three pairs are covered by projections from the sides of 
the cephalothorax; the last Pair is a little more elongated and not 
covered by any projection, The troehanters of the first two pairs 
of legs are undivided; that of the two last pairs is divided into 
two joints, . i 
The coxae and the'one or two trochanters have universal articula- 
tions which permit the appendage to move in forward, backward and 
lateral directions. The articulation between the femur and the tro- 
Chanter is a ginglymous one, having its main motion upwards, serving 
to change the direction from the møre or lesg horizontal to one 
approaching the perpendicular. This upward movement ig supported 
