Microscopical Essays. 



445 



VORTICELLA CoN V ALL ARIA. 



Simplex, gregaria, flore campanulata mutico, tentaculis bige- 

 minis, ftirpe fixa, Fig. gg, PL XXII. Simple, but gregarious, the 

 florets bell-fhaped, with two pair of little arms, and a fixed ftem. 



Vorticella fimplex, campanulata, pedunculo retortili. Muller 

 Animal Infuf. 



Thefe vorticellae, or bell animals, as they are termed by Mr. 

 Baker, are generally found adhering to fome fubftance in the 

 water; they are reprefented here as found by M. Roefel, fixed to 

 a curious cornu ammonis, with points projecting from the back. 

 To the naked eye they appear only as fo many little white points, 

 but under a microfcope, as little bells, agitating the water to a 

 considerable diftance. The ftems of thefe have a particular mo- 

 tion, they draw themfelves up, and fhorten all at once, taking 

 the form of a fpiral wire, or fcrew ; in a moment after they again 

 refume their former fhape, flretching themfelves out (trait as be- 

 fore. Many of them may be feen at times adhering to each 

 other by their tails ; the cilia, which are two on each fide of the 

 mouths, are very feldom to be perceived. 



Vorticella Urceolaris. Fig. 33, 34, 35, Plate XXII. 



Simplex, pedunculata, ore dentato. Single, with a fhort tail, 

 and toothed mouth. 



Brachionus capfularis tefta ovata apice fexdentata bafi incifa, 

 cauda longa bicufpi. Muller Animal Infuf. p. 356. 



To 



