530 BIOLOGY. 



3237. The nervous system in like manner accom- 

 panies the tegument. It consists of two gangliated 

 cords passing along the ventral surface. 



3238. As the maxillae are only repeated feet, so they 

 are rarely wanting, and are, like the latter, disposed after 

 the fashion of scissor-blades. The same holds good of 

 the antennae ; they are mostly in pairs, and consist of a 

 series of rings projecting from the head. 



3239. The eyes are usually present, but only as tegu- 

 mental organs, or placed upon the points of the antennae. 



Class 1 . Reticular or Papillary Animals. 



3240. The repetition of the Intestinal or Vascular 

 animal, taking place under the dominion of the respira- 

 tory system, must be accompanied by the vascular 

 system. The tegument is a vascular, a branchial mem- 

 brane, a branchial network or skin. 



3241. A body with predominating tegumental and 

 intestinal system, is cylindrical. It can only become 

 gross or lump-shaped, if the glandular viscera, such as 

 liver, ovarium and testes, get the upper hand or prevail. 



3242. A tegument which appears as a branchial 

 membrane, is annulate or ringed. 



3243. An animal, having an annulate respiratory 

 membrane without annulated feet, is a Worm. 



Upon the lowest stage the vascular system is still 

 similar to that of the Vascular animals ; its blood is a 

 colourless fluid White Worms, Entozoa. 



In order to be a Worm, it is sufficient to have an 

 annulate tegument. Even if the intestine be wanting 

 and the tegument supplies its place ; the character is 

 nevertheless complete. Here it is the skin, which digests, 

 while in the Intestinal animals it is the intestine, which 

 digests and breathes. Since it is here the tegument, 

 which undertakes the offices of the whole body ; the 

 vessels, liver, and salivary glands are wanting unto the 

 intestine. 



The sexual parts are also frequently arrested and the 

 ova appear to originate in the tegument. 



