WORMS. INFUSORIA. 104. Brachionus. 



693 



ORDER V. INFUSORIA. 



Minute fimble animalcules^ jeldom vifible to 

 the naked eye. 



104. BRANCHIONUS. Body contraaile, 

 covered with a fhell, and furnilhed at 

 the head with ciliate rotatory organs. 



*Urceolaris Bell-fhaped, with the (hell many-toothed at the tip and 

 rounded at the bafe: tail long, bifid at the end. 

 Sba<w h'atzir, Mi fell, tab, 195, 

 Baker Microfc p. 338. tab. 12. f. 7 — 10. 

 Adams Microfc. p. 568. tab. zz.f. 36 — 38. /. 2J.f. 56, 57. 

 Vorticelia urceolans. Dom<v. Brit Inj. tab.ij.f. 1, 2. 

 found frequently in ftagnant water, appearing to the naked eye 

 as a fmall white fpeck : rotatory organ double, which it can 

 protrude and conceal at pleafure. 



Patella, Univalve, with the fhell 2-toothed at the tip and emargi^ 

 nate at. the bafe : tail ending in 2 bridles. 

 Joblot Microfc. i. 2. tab, 4./. F. G ? 



Inhabits ftagnant water of Europe: (hell flat, cryftaline, ovate- 

 orbicular; head, trunk and tail diftincl. 



*Striatus, Univalve, with an ovate flriate fhell 6-toothed at the tip 

 and entire at the bafe; without tail. 



Adams Microfc. p, 364. tab. 27. f. 64, 65. 



In fait water: pellucid, cryftalline, truncate on the fore-part and 

 rounded behind : y£/// varying in form, with 12 longitudinal 



ribs. 



Qirratus, Bivalve ; the fhell unarmed and abbreviated at the tip and 

 2-horned at the bafe: tail long ending in 2 brillles. 

 Jobiot Microfc. 2. p. 54. tab, 6./. 10. A — D. 

 Inhabits waters of Europe; ventricofe and fubpellucid : Jhell 

 fhorter tnan the body : head conic and bearaed each iide : 

 trunk ovate. 



% %ripus^ Pivalve: the fhell unarmed at the top and 3-horned at" the 

 bafe: tail double. 

 Adams Microfc. p 566. tab. 27. f 59. 



found in waters which have been kept fometime, very pellucid 

 and nearly triangular, with a double rotatory oigan, 



*Uncinaius, 



