6 g 4 WORMS. INFUSORIA. 104. Brachionus. 
Bivalve; fhell unarmed and rounded at the tip, the bafc I' 
toothed : tail with % brifties. 
Adams Micro/c. p. 567. tah. 27. f. 55. 
Found in ditch-water: £jell rounded and capable of beifS, 
opened at both ends, the fore-part armed with a hook : 
compofed of 4 or 5 points. 
*Mucrona- Bivalve ; (hell 2-toothed at tlje bafe and tip : tail with ® 
tus. double fpine. 
Mull Ferm. i. i,p. 134. «. 146. 
Found in ftagnant water : rotatory organ mucronate in the inid' 
die: tail with moveable pellucid fpines: fietl cryftallinei 
rather oblong, truncate both fides, 
Ceniuus. With a hairy peduncle and drooping heads, 
Pall. Spioil. Zool \Ostab.\. f. 10. 
Found in the Tubularia ftjluie/a. 
*Calycifo- Simple, calyciilate, with the ihell crenate behind and 0 
upper lip of the mouth 4-toothed. 
' Baier Micro/c. p, 304. tab. l z,f, 4 — 6. 
Found jn various waters. 
Tubifex, Shell tubular, punflure'd: body producing offspring in 
pppofite dircdlion ; bopder lobed and ciliate. 
Schxff Monogr. 1755. tab. 
Inhabits llagnant waters : probably not of this Genus, 
*^adri~ Shell vcntricofe, 4*toothed at the tip : rotatory organ dot*' 
dentatus, ble: the bafe 2-horned: tail long, ending it} 2 
points. 
Adams fsf Kcensn, Micro/c. p. 569. tab. i."], /. 58. 
Baker Mic. tab. I 2. /. 1 1 — 13. 
Hermann. Natur/. ig. p. 47, tab. 2. f. g. , 
Inhabits llagnant waters, and fwims with great fwiftnefs: 
very pellucid, 
•Patina, Shell orbicular, unarmed, entire, with a double rotatof/ 
organ and Ihort limple tail. 
Hermann. Natur/. 19. p. 48, tab. z. /. lo. 
Eikhorn Natur g, WaJ/erm, tab. 1./. 2. 4. 
Vorticella circularis. Shavo Nat. Mi/c. tab. 199. 
Found in llagnant waters filled with vegetables. 
