222 
on which it is impossible, even after the most careful 
cleaning in caustic potash, to discern the slightest trace 
of softer integument at the sides; this ring has posteriorly 
a circular hole as opening for the intestines, the edge 
of which forms a rather firmly chitinous ring in the 
mentioned hole.« It is the last mentioned ring which 
Pocok regards as the 12th segment, and he is right, no 
doubt; after a closer examination the wording of the 2 
last of my sentences is not quite satisfactory, because 
the little »ring« consists of a half-moon like tergite and 
a similar sternite, each furnished with 2 setæ and 
separated on the sides by a narrow, but very distinct 
membrane. 
Croneberg says (op. cit. p. 442) that anus »bildet 
eine schmale Querspalte auf einer ovalen Analplatte, 
deren beide Lippen je ein paar kleine Borsten tragen<, 
and this is just the 12th segment. 
In Arthr. Dan. I have stated (p. 525) about the 
Cheliferince that the tergite and the sternite of the 11th 
segment on the sides are connected with a soft, light 
articular membrane. This is correct as to the genera 
Chiridium, Chelifer and Garypus; in Olpium Her- 
mannt Sav. the lateral membrane is on each side a 
short way interrupted by more solid chitine, the whole 
structure, however, bears but little resemblance to 
Obistine; in Olprum furciliferum Balz, an animal at 
that time unknown to me, the tergite and sternite are, 
on the contrary, coalesced as in Obisium, the lateral 
chitine is, however, a little lighter than the rest of 
the segment. 
It is evident from this representation that the sternite 
answering to the Ist tergite is mentioned several years 
before Pocock’s paper by me in Garypus, by Croneberg 
in Chernes, that the 12th segment is seen by the same 
authors, but not interpreted as an abdominal segment, 
