166 ABSTRACT OF THE INFUSIONSTHIERCHEN OF EHRENJBERG. 



Genus GONIUH. 



Eye and tail not present ; lorica single, developing by spontaneous 

 self-division, in flattened, tabelliform, and square polypoid masses. 



Five species are known : four have green animalcules within the 

 transparent general lorica, the other is colourless. 



Genus SYNCRYPTA. 



Eye and tail not present ; lorica double clustering Cryptomonades 

 enclosed \vithin a common envelope. 



Only one species is described : this is of a green colour. 



Genus SYNURA. 



Eye not present ; tail present, attached to the base of the lorica or 

 to the centre of the polypoid mass. 

 Species one : of a yellow colour. 



Genus UROGLENA. 



Eye and tail present ; division of corpuscles simple and uniform. 



After self-division has taken place once within the general lorica, the 

 creatures resulting from such division do not divide into secondary 

 polypoid masses. 



Species one : creatures of a yellowish colour, with a red eye. 



Genus EUDORINA. 



Tail not present ; eye and filiform proboscis present ; division of cor- 

 puscles simple and uniform. 



Species one : of a yellow colour, and has a red eye. 



Genus CHLAMIDOMONAS. 



Tail not present ; eye present ; filiform proboscis, double ; division 

 of corpuscles simple and uniform. 



Species one : corpuscles green, with a red eye. 



Genus SPHAEROSIRA. 



Tail not present ; eye present ; filiform proboscis simple ; division 

 of corpuscles compound and unequal. 



After general self-division has taken place within the common enve- 

 lope, the creatures resulting from such division again divide, forming 

 secondary clusters. 



Species one : of a pale green colour ; the eye is red. 



