HANSEN AND SÖRENSEN: THE ORDER PALPIGRADI. 233 
ward and somewhat backward turning lobes, each of which (fig. 
2) is provided with four setz, the innermost one very short, 
the others increasing in length outward, the outermost being to- 
lerably long. 
Third segment. Provided anteriorly on the ventral side 
with a couple of downward turning projections which are rather 
closely covered with tolerably strong sets. 
Fourth segment. Provided on the ventral side in front 
of the middle with a wartlike protuberance whichs bears six stiff 
sete, almost spines (aczlez), arranged in two transverse rows, the 
foremost of which is arched and has four spines — GRAssI seems 
to consider these spines as sensory organs, an opinion we by no 
means share. 
Sixth segment. Is furnished on its ventral side with a 
rather strongly protruding wart, bearing a somewhat arched trans- 
verse row of six forward-curving sete. — We do not think 
these to be sensory organs either. 
The three posterior segments (9:th—-11:th) form — as 
the 1o:th—12:th segment in Uropygz — a kind of short »tail», 
being — especially the tenth and eleventh — considerably nar- 
rowed; of these the eleventh is notably longer than the preceding 
one. The narrowed shape of these segments probably has the 
effect of allowing freer movements to the supra-anal flagellum. 
On the last abdominal segment a long jointed flagellum is 
articulated above the anus (figg. 1, 3, 17). This flagellum is 
not complete in any of our specimens; the greatest number of 
joints we have seen is nine; in our fig. 1, however, we have 
drawn five joints more in fainter tint, but this is done exclusi- 
vely on Grassi’s authority; he says (p. 158, fig. 10) that the 
flagellum contains altogether thirteen or fourteen joints. Each 
of these joints is fusiform, as if composed of two truncate cones 
— one long, the other short — united at their base, and adorn- 
ed with two rings!® of backward-turning setiform hairs; in the 
foremost ring, situated on the widest part of it, we find — where 
15 As the fact of GRASSLS fig. 10 only showing one ring of hairs on 
the joints of the’ flagelium, might seem to indicate that the animal examined 
by us belonged to another species, we observe that in his text (p. 158) GRASSI 
nevertheless mentions two rings. 
If 
