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verse fissures along the posterior margin, but a number 
over the surface of the plates. 
9th sternite with less fissures than the 8th one, 
several of which are very oblique. 
10th sternite with c. 15 or 20 on each half, 
mostly longitudinal and oblique fissures, fewer longi- 
tudinal fissures. 
11th sternite very much like the 10th one, but 
more of the fissures are comparatively longitudinal or 
oblique fissures. 
The dorsal side of the abdomen. 
Fissures are found on all the tergites, but not quite 
as many as on the sternites; the distribution almost 
like that on the sternites. 
In the membrane between the tergites and the 
sternites numerous chitinous, small plates, on some of 
the largest of which I have found one single fissure. 
12th abdominal segment. At the posterior 
margin on the middle of the exterior side a group of 
3 or 4 large longitudinal fissures, visible under the 
magnifying- glass, besides towards the dorsal side one 
longer fissure; the whole segment, especially towards 
the posterior margin, is besides furnished with numerous, 
small fissures, many of which are longitudinal fissures. 
The caudal file (telson). 
I have found on this some of the common, very 
short, spread fissures, but very few indeed. 
From the above long list it is evident that Thely- 
phonus is exceedingly richly furnished with these sense- 
organs, having the shape of fissures, that on the legs 
there is an organ (on the 6th joint) built like the highly 
developed organs on the members of Aranece, but that 
on the other hand there are found less regular groups 
with some, even up to many fissures on several joints 
