WORMS. INFUSORIA. 82. Vorticella. 219 



757. Br. uncinatus. Bivalve, with the shell unarmed 

 and rounded at the tip, 1-toothed at the base; tail 

 with 2 bristles. 



Adams Microfc. p. 567. tab. 27./. 55. 



In ditch water : shell rounded and capable of being opened at 

 both ends, armed with a hook orrthe fore-part : tail consisting of 

 4 or 5 joints. 



158. Br. mucronatns. Bivalve, with the shell 2-toothed 

 at the top and bottom ; tail with a double spine. 



Muller Verm-, \. \. p. 134. ». 145.- 



In stagnant water: shell crystalline, rather oblong, truncate at 

 both ends : tail with moveable tranfparent fpines : rotatory-organ 

 mucronate in the middle. 



759. Br. calyciflorus. Simple, calycled, with the shell 

 crenate behind ; upper-lip of the mouth 4-toothed. 



Baker Microfc. p. 304. tab. 12. /. 4-6; 

 In putrid and fresh waters. 



760. Br. quadridentatus. Shell inflated, 4-toothed at 

 top; rotatory organ double; the base 2-horned; 

 tail long, ending in 2 short points. 



Adams and Koznm. Microfc. p^ 569. tab* 27. f. 58. 



In stagnant waters moving with great celerity, and often at- 

 taching itfelf to duckweed by means of its tail: shell very 

 tranfparent, 



761. Br. Patina. Shell orbicular, unarmed, entire, with 

 a double rotatory organ, and short simple tail. 



Vorticella circularis. Shaw Nat. Mis. t. 199. 

 Ih stagnant waters abounding in aquatic plants, 



82. VORTICELLA. 



A . Seated on a pedicel or stem. 



762. V. Polypina. Compound, bell-shaped, with a re tor- 

 tile much branched stem. 



Adams Microfc. t. 27. /. 61. Nat. Misc. t. 278. 



In sea water, adhering to Fuci, appearing to the iiaked eye like 

 a white point, and has a double fpontaneous motion. 



763. V.anastatica. Compound, bell-shaped, with an 

 oblique mouth, and scaly rigid stem. 



Adams Microfc. p. 397. tab. 21./. 13-16. 



In fresh waters, forming a cluster branching out in various di- 

 rections : ovaries ieated on the stems in the form of bulbs, which 

 detach themselves from the stems, and fix themfelves to other 

 substances, producing anew cluster. 



TS-k V.pyraria. Compound, branched, with inversely 

 conic naked florets, and 2 double tentacula. 



Adams Microfc. p. 400. tab. 22. /. 25. 26. 



In stagnant waters, long, fetaceous, rigid, pellucid at the bafe, 

 truncate at top. with 1 lateral arms each side. 



765. V. opercularia. Compound, branched, with oval 

 naked florets closed with a fringed lid. 



Adams Microfc. p. 401-. tab. 22./. 29. 



In stagnant waters : stem, much branched, jointed. 



766. V. tuberosa. Stem forked, with turbinate florets, 

 each with 2 or 3 tubercles. 



Baker Microfc. p. 350. tab*. 1 3./. 10-13. 



