WORMS. INFUSORIA. 105. Vorticella. 699 
Cyathina. Simple, cup-fhaped, with a twifted ftem. 
Mull. Zool, Dan. 1. pr 13h. 2.63. tab. 35. f. 1. 
In fea water which has been kept fume time; hivaline, vague, 
with a thin long ftem; Zead fub{pherical, ventricofe. 
Putrida. Simple, with a retractile tip and rigid ftem. 
Mull. Zool. Dan. 1. 5.132. 4. 64. tab. 35. f. 2. 
In putrid fea water: hyaline, gelatinous, oblong, ventricofe, the 
orifice clofing into an oblong tubercle: few hardly twice as 
long as the head. 
Patellina. Simple, faucer-fhaped, with a retortile ftem. 
- ? f: 
Mull, Zool. Dan. bs Pl33- 4. Dos tab. 35. f. 3. ; 
In fea water which has been kept a little while: hyaline, quick 
in motion: /fem thin, 4 times as long as the head. 
B. Furnifbed with a tail. 
* Fhfeul,a Cluftered, oblong-ovate, with a dilated pellucid difk. 
Adams Microft. p. 557. tab. 27. f. 615.52» 
Inhabits fens, adhering to the Ceratophv!lum, and appears to 
the naked eye like a yellow globule: Aeadotten drawn into the 
abdomen, exhibiting a broad kidney-fhaped difk : abdomen ob- 
long-oval, pellucid, with a few black {pots: sai/ fharp, twice 
as long as the abdomen, and rough, annulete or fmooth. 
*Socialis, Cluftered, clavate, with a rough furface. 
Hydra focialis. ddams Microfe. p. 395. 1. 21. fa 11. 
Philof. HravJ. 49. p. 249. tab. 7. f. 1. 
Reef luf. 3. polyp tad 94. f. 1— 6.1. 95, 96. 
Ledermutler Microfe. tab. 88. f. f. g. 
Inhabits llagnant waters, growing in clufters on the Ceratophyl- 
Jum, and united by their fmall thin tails to a common centre: 
Lead Sometimes contracting into an almoft globular form. 
*Stentorege, "Trumpet-fhaped, with a ciliate margin. 
Hydra ftentorea. Adams Micr. p. 392. t. 22. f. 27, 28. 
Baker Micogr. 5. 340. tab. 13. fig. A. f, g. 
Reef. Inf. 3. polyp. P. 594. 125.94. f: 7, 8. 
Ledermuller M.erefc- tab. 88. f. d. e. i. 
Inhabits frefh waters, adhering fingly by the fhort tail: body 
white, green or blue. 
* Hyacine Simple, furnifhed with an involucre, border of the mouth 
thina. many-toothed. 
Baker Micogr. p. 302. tab. 12. f. 2. 
Vague, oblong, with a taper tail, ij 
T P3 Lariculata. 
