OF ANIMALCULES. 51 



ticella convolaria) : this is rendered more probable by 

 his suspecting the existence of rotatory ciliae at it's an- 

 terior end. Its form is a short cylinder, truncated and 

 hemispherical at the posterior, as shewn, magnified, at 

 figures 25 and 26. It is a very transparent animalcule, 

 and moves about in the direction of its axis with an 

 undulating motion; sometimes revolving. Found in 

 infusions of hay and grass. 



42. Enchelis seminulum. The seed-shaped Enchelis. — 

 The specific characters of these animalcules are, "cylin- 

 drical, with both extremities alike :" their length is about 

 twice their diameter; the anterior and posterior parts are 

 nearly of the same sphericity ; the fore part generally 

 more transparent. In swimming, it usually ascends and 

 descends in the water ; sometimes two are observed 

 united by their anterior ends, probably not completely 

 divided. Found in stagnant water. Size, 1 -1200th of 

 an inch. 



43. Enchelis intermedia, — This animalcule is de- 

 scribed as intermediate between the last species ; the 

 Monas punctum, and the Cyclidium milium. It is very 

 minute and transparent, the edges rather dark : nothing 

 has been observed in its interior. The extremities are 

 similar; sometimes a mark is observed across the middle, 

 which induced the supposition that it had arrived at 

 maturity, and was about to divide. Found in an infusion 

 of Leucajon Jlaviatilis (?) by Muller. 



44. YiNCHELis pirum. The pear-shaped Enchelis. — The 

 head of this animalcule is at the larger extremity, which 



