220 WORMS. INFUSORIA. 82. Vorticelra.. 



In stagnant waters : rigid, with the tubcrclei of the floreti con- 

 vex and radiate. 



767. V. umbtllaiia. Simple, globular, with blackish 

 granulations, and a rigid stem. 



Adams Microjc. p. 402. tab^ i<i.f. 30. 



In stagnant waters, resembling a fpot of mould : heads yellowish, 

 with distinct opake dots : branches forked : clusters flat-topped. 



768. V. berberina. Simple, oval, with a branched rigid 

 stem, and white granulations. 



Adams Microjc. p. 406. Roes. Ins. 3. t\ 99. 



In fresh water: branche s tranfparent, and when clustered toge- 

 ther appearing of a changeable violet colour. 



169, V. nebulifera. Simple, oval, with a reflexile stem. 



Adams Miscrojc. p. 560. tab. 27./. 66. 



On the Conferva polymorpha, invisible to the naked eye : florets 

 narrow at the bafe, truncate and margined when open, oval 

 'when shut. 



? 70* V ' Convallaiia* Simple, bell-shaped, with retortile 

 > T . -stem. 



Adams Microjc. t. 22./. 39. Nat. Mijc. tab. 312. 



In freSh waters, on other fubstances, appearing to the naked eye 

 as fo many white points: stems contracting fuddenly in a fpiral 

 manner, and in a moment expanding themselves again. 



77 x. V.lunaris. Simple, hemispherical, with a crescent- 

 shaped aperture* and retortile stem. 



Adams Micr. t. 27./. 54. Donovan I/is-. t..8.J. 1-3. 



In stagnant waters. : jioret cup-shaped, with a protuberant mar* 

 gin ciliateeach side with undulating hairs. 



772. V.citrina. Simple, variously shaped, with a con- 

 tractile mouth, and equal stem, 



Adams Microjc. p. 558. tab. 27./. 53. 



\n, stagnant water : head large, tranfparent, With greenish-yellow 

 fpecks : Jtem curved^ 



B. Furnished with a tail. 



773. V.Jlosculosa. Clustered, oblong-oval, with a dila- 

 ted pellucid disk. 



Adams Microjccpe p. 557. t. 27. /, 51. 52. 



In fens,, adhering to the Ceratophyllum, appearing to the naked 

 eye like a yelknv globule ; head often drawn into the abdomen, 

 exhibiting a broad kulney-shaped disk ; abdomen, oblong-oval,, 

 tranfparent, with a few black fpecks: taU very sharp, twice as 

 long as the abdomen, frnooth,or rugged with annulations. 



774. Y.socialis. Clustered, ciavate, with an oblique 

 disk and rough surface. 



'Hydra facialis. Adams Microjc. p. 395. t. 2t.J. 11. 



In ditches, growing in clusters on the Ceratophyllum, and 

 united by their fmall thin tails to a common centre : head fome- 

 times contracting into an almost globular form. 



775. V. stenlorea. Simple, trumpet-shaped, with a cili- 

 ate margin. 



Hydra stentorea. Adams Microjc. p. 392. t. 22./. 27. 28. 



In fresh waters., adhering singly by their short tail, and elongated 

 into a trumpet-shaped tube, white, green, or blue, tranfparent. 



776. V. hyacinthina. Simple, furnished with an invo- 

 lucre, the border of the mouth many-toothed. 



Baker Microjc. p. 302. tab. 1 2. /. 2. 



Scattered, oblong, tapering into a, tail* 



