Vorticellina.] THE INFUSORIA. 271 



larger egg-shaped ones, having hairs at their point, and only 

 a little round, but not vibratile, opening. The latter ones are 

 most probably parasitical bodies, the others are not. This 

 genus is not figured by Ehrenberg. 



417. OPERCULARIA articulata (V. Opercularia, M.) 

 The articulated Opercularia is in the form of a little 

 shrub, l-6th to l-4th high, white and dichotomous. This 

 animalcule readily takes in carmine and indigo ; and 

 Ehrenberg states, he saw as many as forty-four stomach- 

 cells filled, resembling a girdle in the middle of the body. 

 The stalk is very delicately striated in a longitudinal 

 direction, and shews, at its divarications, a transverse line, 

 or joint. Found upon Dyticus marginatus. Size 1-43 Oth. 



Genus XCIV. ZOOTHAMNIUM. The double-shaped little 

 bell Animalcules comprehend Vorticellina with a flexible 

 spiral pedicle, having an internal muscle, and becoming 

 branched, from imperfect spontaneous division. The 

 stalked corpuscles are of different shapes, and have a 

 simple lateral mouth opening. In one species, a wreath 

 of cilii, placed around the frontal region, constitutes the 

 locomotive apparatus ; and a special muscle or fibre runs 

 along the branches and stem. Artificial means are able 

 to demonstrate numerous round stomach-cells. No re- 

 productive organs have been detected ; but simple and 

 compound self-division has been observed. 



418. ZOOTHAMNIUM arbuscula ( Vorticella racemosa, M.) 

 The tree-like Zoothamnium has the branches of the little 

 tree in racemes or umbels; the corpuscles being white, 

 and the pedicle very thick. (Seefy. 247, which is more 

 highly magnified than 248). These beautiful little trees 

 resemble plumes of feathers, at once distinguishing them- 



