OF ANIMALCULES. 53 



met with it among healthy duck-weed, and it is said to 

 be found in pure water. 



49. Enchelis similis. TJie ring Enchelis. — This spe- 

 cies is opaque, with a pellucid margin. It is of a glo- 

 bular form, inclined to an oval^ and filled with move- 

 able spherules. The pellucid appearance of the edges 

 is probably occasioned by a fringe of ciliae. It moves very 

 rapidly. Found in river-water, kept for some months. 



50. Enchelis serotina. The sluggish Enchelis. — This 

 is an egg-shaped animalcule, with its fore part rather 

 pointed. The margin is dark, and the interior filled 

 with immoveable grey molecules : it moves slowly. 

 Found in marshes, in September. 



51. Enchelis nebulosa. The nebulous Enchelis. — This is 

 a very scarce animalcule ; found along with the Cyclidium 

 glaucoma. It is of an egg shape, with the fore part not 

 so pointed as the last species, and the interior is in 

 motion. In swimming it keeps the head inclined up- 

 wards, and is about l-400th or 1 -500th of an inch in 

 length. (See Book III). 



52. Enchelis caudata. The tail Enchelis. — This scarce 

 animalcule is of a grey colour, with small molecules 

 within. Its form is shewn, greatly magnified, at figure 

 28. The head is terminated obtusely. 



53. Enchelis epistomium, — This species is very mi- 

 nute and diaphanous : the body is cylindrical, and ter- 

 minated obtusely; the head is globular ; a dark line is 

 sometimes observed down the middle. See figure 29. 



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