335 
more species — especially of the last-named family — must be 
examined before it can be embodied in the diagnoses. Finally it 
can be mentioned that in some large species of Pauropus the tarsus 
of the ninth pair presents a faint indication of a division into two 
joints, but this spurious articulation or thin-skinned place is always 
situated outside the middle of the tarsus and has nothing to do 
with the sharp division into metatarsus and tarsus existing in the 
eighth and other pairs, in which the metatarsus is always much shorter 
than the tarsus. 
The structure of the apical organs of the tarsus have never 
been correctly described. In the family Pauropodidæ they are ra- 
ther complicated and, as far as I have been able to see, almost 
similar in species very distant from each other. Each tarsus ter- 
minates in a claw and a kind of empodium. The claw is moderately 
long or rather short, its dorsal side is strongly chitinized (pl. II, fig. 
4e, c) while the lower part is more membranous; this lower por- 
tion is distally narrow, proximally it is much thicker and forms 
an oblong pad (m). On the front side of the claw is found an oval 
pad or thick vertical lamella (n), the dorsal margin of which is ra- 
ther well chinitized, slightly convex and at the distal end produced 
in a very small, acute, claw-shaped process. On the posterior side 
of the larger claw is found a claw, which is exceedingly small in 
the ninth pair of legs (pl. II, fig. 4f, 0), and considerably longer 
in all the other pairs (fig. 4g, 0), but always smaller than the 
real claw; 'close at the base of the secondary claw originates a 
large, oblong, rounded pad or thick lamella (p in fig. 46, 4f and 
åg). To give a summary: the main claw has a proximal pad; the 
empodium is divided into two parts, the anterior of which is a 
large pad terminating in a minute claw (or a claw with almost the 
whole lower margin clothed with a large pad), while the posterior 
Part consists of a claw and a separate pad. — In Brachypauropus 
the organs in question are so small that I have been unable to see 
all details with certainty without dissection ; the median claw is 
shaped almost as in Pauropus, but its proximal pad is less me 
