WORMS. INFUSORIA. 105. Vorticella. 699 



Cyathina. Simple, cup-fhaped, with a twitted ttem. 



Mull. Zool, Dan, 1 . p. 131. n. 63. tab 35-/*. I . 

 In fea water which has been kept, Tome time; hvaline, vague, 

 with a thin long item : head fubfphaerical, yentricofe. 



Putrida. Simple, with a retractile tip and rigid ttem. 

 Mull. Zool. Dan. 1. p. 132. «. 64. ta£. 35. /*. 2. 

 In putrid fea water: hyaline, gelatinous, oblong, ventricofe, the 



orifice doling into an oblong tubercle: fern hardly twice as 



long as the head. 



fatellina. Simple, faucer-fhaped, with a retortile ftem. 

 Mull. Zool. Dan. l. p. 133. n. 65. tab. 35./". 3. 

 In fea water which has been kept a little while: h) aline, quick 

 in motion : Jie?n thin, 4 times as long as the head. 



B. Furnijhed with a tail* 



*Fhfculo J a Cluttered, oblong-ovate, with a dilated pellucid difk. 

 Adams Microfc. p. 557. tab. 27. f, 5 I , 52. 



Inhabits fens, adhering to the Ceratophylium, and appears to 

 the naked eye like a yellow globule : biadohtvk drawn into the 

 abdomen, exhibiting a broad kidney. fhaped difk : abdomen ob- 

 long-oval, pellucid, with a few black fpotj : tail (harp, twice 

 as long as the abdomen, and rough, annulate or fnaooth. 



*Socialis, Cluttered, clavate, with a rough furface. 



Hydra iocialis. Adams Microfc. p. 395. t.,z\.f, II. 



Philof TranJ. 49. p. 249. tab. 7 /f. I. 



Reef. Inf. 3. polyp, tab. 94, f. 1 — 6. /. 95, 96. 



Ledermuller Microfc. tab. SS.f. f. g. 



Inhabits itagnant waters, growing in clu iters on the Ceratophyl- 

 ium, and united by their fmall thin tails to a common centre : 

 head iomctlmes contracting into an almoft globular form. 



*Stentorea. Trumpet-fhaped, with a ciliate margin. 



Hydra ftentorea. Adams Micr.p. 392. t. zz.f. 27, 28, 

 , -"" Baker Micogr. p. 340. tab. I 3. fig l. f, g. 

 Roef Inf. $. poiyp.'p. $()±. tab\q$. f.jy%. 

 LedermulUr Microfc- tab. 88./. d. e. i. 



Inhabits frefh waters, adhering fingiy by the fhort tail : body 

 white, green or blue. 



* Hyacin* Simple, furniftied with an involucre, border of the mouth 

 thina, many- toothed. 



Baker Micogr. p. 302. tab. 12. f. 2. 

 Vague, oblong, with a taper tail. 



4 T 2 Auriculata, 



