Vibrionia.] THE infusoria. 141 



polymorpha. Fiyure 525 is from Sphagnum capillifolium. 

 All the above are represented magnified 1000 diameters. 

 Figures 526 to 528 are from the Chara vulgaris, and 

 figures 529 to 531 from Jungermannia pinguis, as figured 

 in Meyen's work, entitled Neues System der Pflantzen. 



Genus XXX. Spirodiscus. The disk-spiral Animalcules 

 are characterized by developing themselves, through an 

 imperfect self-division taking place in an oblique direction, 

 in elongated chains, or into inflexible spirals, of a disc-like 

 figure. Its organization is so little known that Ehren- 

 berg considers the genus as by no means satisfactorily 

 determined. 



103. Spirodiscus fulvus. The yellowish-brown Spiro- 

 discus. — A lenticular spiral, of a yellowish-brown colour. 

 Articulation indistinct. Gi'oup 62 represents three spirals, 

 magnified 200 diameters. Found amongst conferva. 

 Breadth of spiral 1-1 200th. 



