OF ANIMALCULES. 133 



anterior part is produced and curved, near to which, 

 within the margin, are disposed four strong hooks ; be- 

 low these, on the same side, is disposed a row of long 

 cilia. 



303. Trtchoda lagena. The bottle-shaped Trichoda, — 

 The form of this animalcule is similar to a Florence oil 

 flask : the neck is small and transparent ; the body ter- 

 minated with a row of bristles. 



(h) Loricated. 



404. Trichoda inquilina {Vaginicola, L.). — This cu- 

 rious animalcule, which is shewn at figure 175, is in- 

 closed in a diaphanous tube -, sometimes two of them are 

 seen in the same shell, as shewn in the sketch -, this is 

 probably an animalcule divided : when a single indi- 

 vidual occupies the shell, it is generally longer, and the 

 tail reaches to the bottom of it. 



305. Trichoda ingenita. — This animalcule is inclosed 

 in a delicate shell, slightly contracted near the aperture, 

 as shewn at figure 178. The inhabitant is soft-bodied, 

 and can either contract itself, so as to remain entirely 

 within the shell, or stretch itself out, and protrude be- 

 yond it : the upper extremity is furnished with cilia, like 

 the Vorticella convallaria. It propagates by a longitu- 

 dinal division. Found among confervse. 



306. Trichoda innata. — This animalcule, which is 

 shewn at figure VJ9, is distinguished from the preceding 

 by the form of the shell, the tail being produced be- 

 yond it. It is an entertaining object for the microscope. 



