ABSTRACT OF THE INFUSIONSTHIERCHEN OF EHRENBERG. 



165 



pendages or members, provided with an envelope or lorica, dividing by 

 spontaneous self-division into numerous individuals within the ex- 

 tensile lorica, and hence assuming a polypoid appearance. Lorica 

 at length bursting, and allowing the several animalcules to disperse 

 when they have arrived at the due degree of maturity. 



The following is a Synoptical Table of the Genera : 



Vibratile proboscis ) -, 



Organ of 



sight 



not 



present 



Organ of 



sight 

 present 



Caudal 

 appendage 



not 

 present 



Lorica 

 single 



Lorica 

 roundish 



not present 



Vibratile proboscis I PANDORINA 

 present ) 



Lorica tabulated or compressed GONIUM. 



Lorica double SYNCRYPTA. 



\Caudalappendagepresent SYNURA. 



Self-division /Caudal appendage present UROGLENA 



equal and perfect 



(forming no ] Caudal (Proboscis single ... ETTDORINA. 



secondary polypoid appendage 

 rnassps"! ' nnt. nrpspn 



masses) 



not present ^ Proboscis double... CHLAMIDOMONAS. 



Self-division unequal ( Proboscis single -. SPHAEROSIRA. 



(forming secondary j 

 polypoid masses) I Proboscis double VOLVOX . 



Genus GYGES. 



Eye and tail not present ; lorica single, urceolate, subglobose ; crea- 

 ture destitute of a vibratile filiform proboscis. 



Only two species are described; the several creatures within the 

 common envelope being of a green colour. 



Genus PANDORINA. 



Eye and tail not present ; lorica single, urceolate, subglobose ; crea- 

 ture provided with a vibratile filiform proboscis. From the peculiar 

 mode of self-division, the polypoid-like mass has somewhat the form of 

 a mulberry. 



Species two : one is green, the other colourless. 



