141 
His theory is founded upon the fact that this organ is placed at 
the base of the pseudocapitulum, and this interpretation seems to 
me the most natural, though his prooves are not quite sufficient. 
2. Sense Organs and Hairs. 
A. Sense Organs. The skin is granular all over with small 
round or elongated, irregular, flat granules, except where the muscles 
are fastened; these ellipsoid, muscular, not impressed spots are en- 
circled with somewhat larger granules and are mostly found at the 
sides where the transverse lateral muscles are fastened. The body 
(the head excepted) is punken all over with lyriform fissures of 
different kinds. 
(1). Common fissures (pl. V fig. 13 1), similar to those found 
in many Arachnids especially in the Chelonetni (H. J. HanSen 7 
pag. 205—211. pl. IV fig. 12) are found at the thoracic and first 
abdominal tergites. The first thoracie tergite has only four fissures, 
the -second about 40, the first abdominal tergite bears about 24 
and the second about 16, placed between the two longitudinal 
muscular bands (fig. 13 7! & 12). The fissures are about 254 long 
and more or less straight or irregularly twisted. 
(2). The greater number of fissures consist of two solid ridges 
surrounding an oval thin-skinned space and uniting at their tips 
which are more or less poiuted. The oval space is divided into 
two parts by a longitudinal thin line, swollen at the middle (pl. IV 
fig. 17). Their length is 63 4 and their breadth 18 4. The number 
of these organs is about 250, there are none at the head and 
the sternum, few along the sides and at the thoracie tergites, but 
they are abundant below, behind the genital opening (pl. V fig. 13 Ca). 
(3). The sternum is provided with a third kind of fissures 
which, as shown (pl. IV fig. 19 F) are arranged in a regular manner. 
In the middle behind the foremost lateral group of hairs there is 
on each side an obliquely placed organ which is bent a little back- 
wards; in the same transverse line but more outwards there are 
