514 BIOLOGY. 



3161. As the Infusoria are the seed or vitellus itself, 

 so also are they the very ovum, and require no special 

 sexual parts for propagation. They absorb, and are so 

 nourished, and if there is a sufficient quantity of the mass 

 to admit again of its division into several points, they thus 

 divide. A magnified Infusorial animalcule has become, 

 as it were, an ovarium or a testis, which then produces 

 seed by dissolving itself into the latter. They are a 

 constant conflict of the organ and its product, of the 

 Solid and Fluid, a vitelline and orchitic process. 



Class 2. Intestinal, Albuminous Animals. 



3162. With the separation of the cyst into an internal 

 and external layer, or into intestine arid tegument, the 

 animal must necessarily ascend a stage higher, since it 

 now contains two systems different from each other, and 

 is consequently a double Infusorium. 



3163. The form of the Intestinal animals passes gra- 

 dually from that of the globe into the tube Tubular 

 animals. 



3164. They are tubular nerves surrounded by a 

 tegument. 



The cilia also are perfected and lengthen into fila- 

 ments, which no longer perform simply vortical move- 

 ments, but now actually seize and convey the food 

 self-substantially into the mouth. Such animals are called 

 Polyps. Their multiplication takes place no longer 

 by division or fissure, but by ova and shoots, or ramifi- 

 cation. 



The oviducts or egg-tubes lie between the intestine 

 and tegument, and open upon the margin of the mouth 

 between the tentacula. In many instances the ovisacs, 

 or cysts, hang also freely from other parts of the body, 

 as in the Sertularise. 



The sprouts or offshoots detach themselves from the 

 parent and become independent animals ; but they fre- 

 quently continue to stand as ramules upon the maternal 

 animal, though they nourish themselves independently 

 of the latter. 



