154 



HELMINTHOZOA. 



widely from the Tape-worms, as will be immediately evident from the 

 following details. 



(410.) The body is covered with a sort of semifluid varnish, the whole 

 surface of which is densely clothed with extremely delicate and closely 

 set vibratile cilia, so minute as to be perceived with difficulty, except in 

 the vicinity of the head, where, at certain points, they present more con- 

 spicuous dimensions (fig. 76, b b). 



(411.) The alimentary apparatus presents a remarkable uniformity 

 of arrangement, and, for the purpose of description, may be divided into 

 the mouth, the proboscis, the oesophagus, and the intestine. There do 

 not appear to be either salivary or hepatic glands ; neither is the in- 



Anterior portion of Borlasia camillea. 

 a, buccal orifice ; b b, cephalic fossa, pro- 

 vided with vibratile cilia ; c c, lobes of the 

 brain, brought into communication with 

 each other by means of a broad sub-ceso- 

 phageal commissure, and apparently com- 

 posed of several ganglia conjoined; d d, lon- 

 gitudinal nervous trunks, whence branches 

 are derived which supply the muscles and 

 internal viscera ; e e e e, cephalic nerves ; 

 ff, groups of eye-like specks; gg, cephalic 

 loop of the vascular system ; 1 1, medio- 

 dorsal vessel, which, on entering the ce- 

 phalic cavity, bifurcates to form the trunks, 

 k k, that encircle the brain, and afterwards, 

 at h h, become continuous with the lateral 

 vessels, i i ; m TO m TO, horizontal diaphragm, 

 forming a sheath, in which is lodged the 

 anterior portion of the proboscis, o o ; n n, 

 the ovaria (testes in the male), furnished 

 with caeca that float freely in the lateral 

 chambers of the body. The space com- 

 prised between the septa, to which the ge- 

 nerative organs are attached, forms the 

 central longitudinal cavity wherein is 

 lodged the digestive apparatus. 



testinal canal provided with an anal outlet. The mouth is a minute 

 orifice, situate at the anterior extremity of the body (fig. 76, a), and 

 generally surrounded with cilia of large dimensions, from which a mus- 

 cular canal is prolonged for some distance backwards, at the posterior 

 extremity of which may be seen, folded up in the interior of the body, 

 a powerful proboscis, which is protmsible at the will of the animal, and, 



