Zoologischer Anzeiger 
herausgegeben 
von Prof. J. Victor Carus in Leipzig. 
Zugleich 
Organ der Deutschen Zoologischen Gesellschaft. 
Verlag von Wilhelm Engelmann in Leipzig. 
XVI. Jahrg. 11. December 1893. No. 435. 
Inhalt: I. Wissenschaftliche Mittheilungen. 1. Cole, Notes on the Clitellum of the Earth- 
worm, (Schluß.) 2. Pelseneer, Les appareils excréteur et reproducteur de Elysia. 3. Koenike, Wei- 
tere Anmerkungen zu Piersig’s Beiträgen zur Hydrachnidenkunde. 4. Jungersen, Die Embryonal- 
niere des Störs (Acipenser sturio). II. Mittheil. aus Museen, Instituten ete. Notiz. III. Perso- 
nal-Notizen. Vacat. Litteratur. p. 341—356. | 
I. Wissenschaftliche Mittheilungen. 
1. Notes on the Clitellum of the Earthworm. 
By Frank J. Cole, Physiological Laboratory, University of Oxford. 
(Schluß.) 
The calceo-cuticular glands (Fig. 2 8) are long straight, or wavy, 
tubes, running directly inwards, and in a clitellum which was '55 mm 
thick varied in length from '1—'15mm?. In another specimen ‘6 mm 
wide, they were ‘15 mm long, and I have found them (Zeiß, oc. mi- 
crom. 3, obj. apochr., 40 mm., apert. 0°95) varying from ‘0429 to 
‘2245 mm. With regard to the breadth, I have seen some measuring 
3°3 p, others 6°6 p, and a few even 13:2 p. The amount of variation 
in length and breadth, therefore, is very large. The glands are den- 
sely granular and stain extremely readily — some of the granules hav- 
ing a diameter of 1:1 u. It is very easy, as I have just pointed out, to 
perceive the homology between the calceo-cuticular glands and the 
cells of the hypodermis, and to recognize that the former are simply 
3 Claparéde’s measurements are as follows: [The second glandular layer I 
propose to call the calceo-cutaneous, from its position and the nature of its seere- 
tion. Hence the whole series may be known as the clitelline glands, which are of 
two kinds—viz., 1) the calceo-cuticular, and 2) the calceo-cutaneous. The measure- 
ments in italics are erroneous.]  Calceo-cuticular, 4—5 p wide; granules of same, 
1 u. Calceo-cutaneous (whole layer), 0-4—0-5 mm long, or three-fourths the width 
of the whole integument (excluding muscles); breadth of same, -03—-04 mm. Nu- 
clei, 4 p. long. (See Claparéde’s fig. As I have only observed these once, I have 
not figured them — thinking they might have wandered from the glands them- 
selves.) Nuclei of calceo-cutaneous gland, 5 p. wide. 
27 
