Monadina-I iNFrsoRTAi. axtmalcx^t-fs. 129^ 



and Phacelomonas ; but differs from tlie former in being solitary — 

 not clusteiing, and by the greater number of proboscides ; whilst the 

 last are fewer than in Phacelomonas. This is a new genus es- 

 tablished by Ehrenberg. 



Chlorastek gyrans. — Green ; central part of body fusiform ; both 

 extremities acute ; central rays in a whorl of four. Proboscides 4-5. 

 Size 1632-a. 



Genus Phacelomonas. The fan Monads. — The distinguishing cha- 

 racters of this genus are the numeroixs proboscides placed roimd the 

 mouth of the creature, forming as it were a wreath of cilia, and 

 from 8 to 10 in number. In other respects it resembles Microglena: 

 it has the small red eye, the truncated mouth at the anterior ex- 

 tremity, and is deficient of the tail. It swims in the direction of the 

 longitudinal axis, and its self-division is simple and complete, but 

 not constant in occurrence. Many stomach-cells have been observed 

 within the body, but they have not been seen to admit coloiu'ed food . 

 This genus has not been illustrated by Ehi-enberg. 



M. puJviscuhis {Jlonas pidvisculus, M.) — Form oblong or slightly 

 conical, attenuated posteriorly, and of a beautiful green colour. 

 Just previous to self di-vision, its body becomes cyliadrical, then con- 

 tracts at the centre ; but when djing it changes to a globular shape. 

 In swimming, it turns quickly upon its longitudinal axis, without 

 any vibration. This animalcule demonstrates the fact, that pro- 

 boscides and cilia are organs not materially different from each other. 

 Found in green puddles. Size 1-11 52nd. 



Genus Glen-qmokum. The bride Monads. — This genus is especially 

 indicated by its possessing a single red eye, a truncated mouth, and 

 double filiform proboscis ; by its being destitute of a tail, by the 

 individuals moving on the long axis of the body, by their self-divi- 

 ding simply and completely into two, or not dividing at all ; and by 

 their volunta/rily clustering, as occasion may require, so as to give 

 themselves the resemblance of a bunch of gi'apes. 



In this enumeration of the characters belonging to this genus, we 

 are presented with an excellent illustration of the table (and one that 

 exceedingly well explains its use), under which all the genera of the 

 family Monadina are arranged, so as to exemplify in what respects 

 they are alike, and in what they differ from each other. (For ex- 



