attaches it to any thing with which it may happen to 

 come in contact, and the animalcule so attached swings 

 in different directions, until a particle of food {smaller 

 Infusorials, single Algce. vibrating Algw — spores and so 

 forth) is brought into the mouth, and thence into the chy- 

 miferous cavity, when the stem contracts screw-like. Fre- 

 quently, after water had been standing for hours, a per- 

 fect little tree of these Vorticells is formed, connected 

 by their muscular stems. 



Nine specimens have been drawn consisting of six 

 different Infusorial species. Chilodon, Spirostomum, 

 Enchelys, Vorticella, Paramecium and Volvox. 

 The Chilodon drawing is accompanied with a ligure, 

 showing its successive division into two parts (the so- 

 called semi-partition); the Paramecium body is furnished 

 with a star-shaped vesicle, called Vacuole, placed in the 

 protoplasma of its body, altering its form every moment. 

 This Vacuole is found in almost all Infusorials, and 

 serves for locomotion; also for breathing as the ambu- 

 lacral system of the Echinodermata or of the worms. 

 The different forms (A. Koellikef) of the Vacuole or con- 

 tractile space are shown on the third plate, at the 

 figures XIV, a, 3, v, d, e. 



Another organ in the Infusorial body is the so-called 

 Nucleus, including the Nucleolus. It is an integral 

 part of the whole animalcule, taking part both in subdi- 

 vision and in conjugation of any Infusorial in which it 

 may happen to be. Almost all Infusorials are nucleated. 



The increase of the Infusorials is very rapid, taking 

 place by subdivision, and then scattering the body-cells 

 in all directions throughout a large quantity of water. 



Also, a kind of sexual fructification takes place in the 

 Infusorials, whereby the Nucleus and Nucleolus play 

 the part of the genital organs (Fertilization, Fecundation). 



The type Coelenterata is represented by a single 



