446 
Next to the cuticle there is a very well-marked layer, and here, 
as in fact upon almost all points, I have to differ with Claparede. 
He states (pp. 576—7) that the clitellum is strictly merely a cha- 
racteristically modified part of the integument, and his reasons for 
saying this are that he found in it the various layers ‘and structures 
present in normal integument. After this it is curious to find him 
stating that the most prominent part of the clitellum (i. e., the glands 
d, Fig. 2) has nothing corresponding to it in the hypodermis, and that 
his vascular layer is also peculiar. It is evident that he failed to re- 
cognise the true relationship of the clitellum to the hypodermis. 
Claparede figures (Plate 46, Fig. 1) three elements in the se- 
cond, or first glandular, layer; viz., 1) hypodermic cells; 2) intercel- 
lular spaces; and 3) the necks of the prolongements glandulaires, or 
the »[modified] unicellular cutaneous glands« as they are known to 
English anatomists, and which, in the region of the clitellum, I shall 
hereafter call the calceo-cuticular glands, because they supply the 
cuticular matrix in which the carbonates are deposited, and not be- 
cause they themselves secrete the carbonates, or are in any way mor- 
phologically distinct from hypodermic cells. I have found no hypo- 
dermic cells in the clitellum — a very significant fact which I shall 
consider later on. It is very interesting to cut sections of develop- 
ing clitella, and to notice how the hypodermic cells disappear propor- 
tionately as the clitelline glands mature. One differs with such a 
distinguished worker as Claparède with diffidence, but it is certain 
he was mistaken in supposing that the clitellum was not the entirely 
modified hypodermis. 
a (Schluß folgt.) 
3. Pseudoscorpionidenkniffe. 
Von Prof. C. Berg, Buenos-Aires, 
eingeg. 19. October 1893. 
Die in diesem Blatte veröffentlichten Notizen von Wagner!, 
Leydig? und Hickson3, die Lebensweise der Pseudoscorpioniden 
betreffend, veranlassen mich zu einer Mittheilung, die vielleicht zur 
Klärung der darin behandelten Sache etwas beitragen dürfte. Ich be- 
finde mich nämlich im Besitze einiger sehr interessanten Angaben, 
1 Dr. Franz Wagner, Biologische Notiz. Zool. Anz. XV. p. 434. | 
? F. Leydig, Zum Parasitismus der Pseudoscorpioniden. Zool. Anz. XVI. 
p. 36. j 
3 Sydney J. Hickson, Note on the Parasitism of Chelifers on Beetles. Zool. 
Anz. XVI. p. 9. 
