116 DESCRIPTION OF [Polijgastrica. 



are mentioned by Ehrenberg, both of a green-colour, and 

 enclosed in a transparent lorica. 



70. Gyges granulum {Volvox rjranulum, M.) The 

 grain Gyges. — Form oval, approaching to globular. Body 

 contains a heap of granules within it, of a darkish-green 

 colour. Found amongst lemna and conferva. A magnified 

 representation is given at fig. 34. Size 1-1 150th. 



71. Gyges bipartitus. The bipartite Gyges. — This 

 species has a body of a crystalline gelatinous substance, and 

 of nearly a spherical form ; the superficies being colourless, 

 and its contents of a yellowish green. Its body is some- 

 times divided into two, and at others it is a simple sphere. 

 The internal mass is composed of numerous homogenous 

 granules, which, if the creature be an animal, may be con- 

 sidered as the ova. Found amongst conferva. Size 

 1 -480th. 



72. Gyges sanguineus. The blood-coloured Gyges. — 

 Body oval, colour red, inclining to crimson, surrounded by 

 a broad colourless margin. This is a new species, dis- 

 covered by Mr. Shuttleworth in the red snow, which fell 

 at the Grimsel, in August, 1839; its motion is lively. In 

 plate xii., group 527 shews several highly magnified. 

 Found with Astasia nivalis and Monas gUscens, among the 

 globules of Protococcus nivalis. See Ed. Phil. Jour, v., xxix. 

 Length, 1-1200 to 1 -300th. 



Genus XVII, Pandorina. The berry-like globe Ani- 

 malcules. — The characteristics of this genus are its being des- 

 titute of the eye and tail, but provided with the box-like 

 lorica, of a globular shape, and with the filiform proboscis. 

 During the process of self- division, the internal develop- 

 ment gives the creature the appearance of a mulberry. A 



