$$ 161, 162. 
THE ANNELIDES. 175 
CHAPTER VIII. 
ORGANS OF SECRETION, 
§ 161. 
Many Annelides are covered with a mucus which is secreted by small, 
simple follicles situated in the skin.” 
The calcareous tubes of the Serpulini, appear to be secreted by a collar 
surrounding the first segment of the body. Itis not yet decided that 
the leathery tube in which many other Branchiati are concealed,® is 
secreted by an analogous organ. ; 
Those Capitibranchiati which form tubes with grains of sand, bits of 
shells, &c., have, perhaps all, an opening close behind the mouth upon the 
ventral surface. This opening is in connection with many glands situated 
at the anterior extremity of the body, which probably secrete a substance 
for the gluing together of the materials of these tubes.” 
CHAPTER IX. 
ORGANS OF GENERATION, 
§ 162. 
The Annelides reproduce partly by a transverse fissuration, and partly 
by a sexual apparatus. 
1 Similar muciparous follicles are arranged in 
curved rows with the Hirudinei, upon both the ven- 
tral and dorsal surfaces, giving the skin a granu- 
lated aspect ; see Brandt, Med. Zool. II. p. 244. I 
shave seen similar groups of follicles with the larger 
Lumbricini.* 
2 The secretion of the calcareous matter occurs 
here probably as upon the border of the mantle of 
Mollusks. 
3 Sabella, Onuphis, and Chaetopterus. 
4 As secreting organs of this glue, Rathké has 
correctly described four yellowish glands situated, 
* (§ 161, note 1.) Leydig (Siebold and Kéili- 
&er’s Zeitsch. 1849, p. 109) has described with Pis- 
cicola, Clepsine, Nephelis, and other Hirudinei, 
-cutaneous glands. These consist of an infundibu- 
liform sac, which exactly resembles a nucleated 
<ell, from which passes off a long, tortuous duct. 
with Amphitrite, upon the ventral surface of the 
first and second seginent of the body, and 
opening by a common canal at the first seg- 
ment ; see Danzig. Schrift. loc. cit. p. 71, Taf. V. 
fig. 6, aa. fig. 2,d. With Terebella, and Sa- 
bella, the two glands near the cephalic extremity, 
are perhaps of the same nature. Grube, however, 
thinks them male genital organs ; see, Zur Anat. d. 
Kiemenwitirmer, p. 31, Taf. II. fig. 12, y.; and 
Miine Edwards, Ann. d. Sc. Nat. X. 1838, PL. X. 
n. Pl. XI. fig. 1, h. fig. 2, f. 
With Piscicola, these are situated in the cephalic 
and pedal shield, but in Clepsine, and Nephelis, 
they are also present in the skin throughout ; see 
loc. cit. Taf. VIII. fig. 23. This structure is re~ 
markable from its resemblance to some of the cuta- 
neous glands of the higher animals. — Ep. 
