130 CLASS X1T. ORDER II. 



BRANCHIOXUS, (shelled jellies,) body contrac- 

 tile, covered with a shell, 'and furnished at the 

 head with ciliate rotatory organs. In stagnant 

 waters. 



ORDER 2. HOMOGENIA. 



Bodies of various forms, having neither mouth? 

 stomach, nor any other viscera. Some have ap- 

 pendages resembling cilia, some appear like mere 

 points, some are globular and more rapidly with- 

 out any apparent organs of motion, some change 

 their forms every moment. 



TRICHODA, (hair-head,) worm invisible, pel" 

 lucid, hairy, or horned. In all waters. 



CERCARIA, (green scum,) worm invisible to the 

 naked eye, pellucid and furnished with a tail. 

 These insects constitute the green pellicle on stag- 

 nant waters. 



LEUCOPHIA, worm invisible to the naked eye> 

 every where ciliate. In clear marshy water. 



VIBRIO, worms invisible to the naked eye, very 

 simple, round, elongated. In common water and 

 in vegetable infusions. 



GONIUM, worm very simple, flat, angular, invisi- 

 ble to the naked eye. In pure and stagnant wa- 

 ters. 



COLPODA, (flat-jellies,) worm invisible to the 

 naked eye, very simple, pellucid, flat, sinuate. In 

 pure water, and infusions. 



PARAMECIUM, (oblong jellies,) worm invisible 

 to the naked eye, simple, pellucid, flattened, ob- 

 long. In salt and fresh water and among weeds. 



CYCLTDIUM, (oval jellies,) worm invisible to the 

 naked eye, very simple, pellucid^ flat, orbiculac 



