220 
oblique direction ; from each of the apertures issues into the 
joint a very thin, cylindrical, more firmly chitinised, 
rather short funnel, and from each funnel goes back 
into the finger a less chitinised, very thin duct (Tab. V, 
fig. 11). Outside the apertures is seen a row of small, 
dark dots, the meaning of which is unknown to me. 
On preparations cleaned in caustic potash I believe to 
have seen what is stated above with an enlargement 
of about 1000 times). 
In the folloving I shall set forth a repetition, sup- 
plied with additions and a few alterrations, of my earlier 
statements which appear to have been unnoticed by the 
later authors, except Thorell. I have a special reason 
for so doing, as now I accompany the representation 
with rather numerous new figures. I shall conclude by 
setting up a system which, I presume, answers better 
than the earlier systems to our present knowledge, 
paving attention to all hitherto known more important 
genera. 
E. The Segmentation of the Body. 
In Arthr. Dan. (p. 517) I have shown that the abdomen 
in Chiridium as in the other Chelonethi consists of 11 
segments; the same statement was almost simultane- 
ously given by W. Sørensen in his treatise (Opil. 
Laniat. p. 562), quoted by Optliones. Menge, Simon and 
Tömösväry have indicated 10 abdominal segments in 
Chiridium, and after the publication of the 2 above 
mentioned papers, the error has been repeated by 
Croneberg (op. cit. p. 419) and Balzan (Rev. dei Pseudose. 
p. 409). 
Pocock writes (op. cit. p. 6): »Moreover, in such 
a form as Garypus litoralis the same number of 
somites can be made out in the abdomen as are seen 
