HANSEN AND SÖRENSEN: THE ORDER PALPIGRADI. 225 
we think we may be dispensed from constantly referring to his 
paper, except in cases where such reference seems to us neces- 
sary. We will only observe that we have everywhere compared 
GRASSI'S treatise with our own researches. 
The figures having been drawn by us (or rather by one of 
us) with the greatest accuracy possible, we take the liberty lea- 
ving out of our description such features as can be represented 
in the drawings, and we make a point of stating that where no 
statement to the contrary is made, the spines, setz or hairs which 
are seen in the figures, are in every respect exact reproductions 
of what we have seen. 
As a peculiarity in Koenenza we think right to emphasize 
at once that its skin is but slightly chitinized, especially on the 
abdomen, where consequently there is no distinction between the 
(dorsal and ventral) plates and the pleura, so the expansion 
which the abdomen must be capable of allowing, probably de- 
pends on the elasticity of this thin chitine itself. 
The body consists distinctly of the three parts which are 
typical? of the Arachnida, though, as a rule, they are rather dif- 
ficult to discern, namely, a head with four pairs of appendages, 
a thorax composed of two segments, each with its pair of limbs, 
and a limbless abdomen. 
The Head, as usual in the Avachnida, is very large; it is 
flat on the ventral side, pretty strongly vaulted on the dorsal 
side, and broadest off the coxæ of the third pair of limbs. To 
the front it slopes down abruptly towards the first pair of limbs 
(the chelicere), above the origin of which the foremost couple 
of particular sensory organs are placed (s!, figg. 1, 3 and 7). Ac- 
cording to the rule in Arachnida, its dorsal side forms an in- 
dependent carapace separated from the sternal carapace by a 
softer (in Aoenenta only somewhat softer) skin. The dorsal cara- 
pace is provided with short scattered hairs, the number and ar- 
3 One of us (WILLIAM SÖRENSEN) hopes to publish next year in »Over- 
sigt over det Kgl. Danske Videnskabernes Selskabs Forhandlinger» a memoir 
in French on this subject. 
Entomol, Tidskr. Arg. 18, H. 4 (1897) 3 15 
