210 
The ventral side of the abdomen. 
4th and 5th sternite. 1 short transverse fissure 
on each side of the median line. 
6th, 7th, 8th, 9th and 10th sternite. Asa 
rule 1 short transverse fissure on each side of the 
median line; at times on the hindmost sternites, none 
on the one side, 2 on the other. Besides near the 
lateral margin 1 large, rather oblique transverse fissure 
(compare Bernard, op. cit.; see later on). 
Lith sternite and tergite (coalesced to forma 
ring, see later on). About 8 longitudinal and transverse 
fissures around on the 12th segment. 
The dorsal side of the abdomen. 
lst tergite. 1 middle-size transverse fissure almost 
half way between the median line and the lateral margin 
on each side. 
2d—3d tergite. No fissures found with certainty. 
4th—10th tergite. 1 longer and at times besides 
I short fissure near the lateral margin and more or 
less towards the anterior edge; besides 1 shorter, now 
oblique, now transverse fissure on each side almost 
half-way between the median line and the lateral margin 
(sometimes the one seems fo disappear). 
Cephalothorax. 
Slightly inside the foremost eye 3 or 4 small, 
irregular oblique fissures, partly removed from each 
other. Towards the lateral posterior edge 2 or 3 
irregularly situated small fissures. 
As a rule on specimens treated with caustic potash 
there is in Chelonethi no distinctly limited dilatation 
for the nerve in most of the fissures, which have the 
shape of shorter or longer button-holes. The group on 
the upper side of the trochanter in Obisium is the 
largest and most regular, the fissures of which are 
showing, in contradistinction to the preceeding orders, 
