THE VOLVOX. 39 



dotted all over with green spots, and fringed with cilia, 

 now in the field of view, (pi. ii, fig. 10). 



II. The YoLvox, or Revolving Monad, (pi. ii, figs. 9, 

 10, 11, 12), — The Volvox glohator, or Globe Volvox, was 

 discovered 150 years ago by Leeuwenhoek, and was sup- 

 posed to be a single animal, until the recent improve- 

 ments in the microscope revealed its true character, and 

 shewed it to be composed of a group of monads, fixed in 

 a globular integument, or case, each little green point 

 being a perfect and isolated individual, in organic con- 

 nexion with the case and the surrounding monads. By a 

 power of 500 the globe is shewn to consist of a family 

 of polygastric animalcules, uniformly distributed over the 

 spherical integument. Fig. 12, pi. ii, represents a part of 

 the globe highly magnified: in the centre is seen a group 

 of six individuals, produced by spontaneous fissuration. 

 The monad of the Volvox, (pi. ii, fig. 11), has a red eye- 

 speck, two long spines or horns, and six processes by 

 which it is connected with its kindred animalcules. The 

 little globular cells of the digestive organs are distinctly 

 visible. In fact, we have here numerous perfect monads, 

 partially imbedded in, and distributed over a hollow 

 spherical carapace, or case, instead of on a tabular one 

 as in the Gonium. 



The Volvox increases by spontaneous fissuration, like 



