Philodinaea.'] the INFUSORIA. 407 



be preserved for years. It is often met with in vegetable 

 infusions of different kinds ; in these, however, it never 

 originates, but only increases in number Length 1-1 20th 

 to 1-4 8th. 



700. Philodina roseola. The rose or Jlesh-coloured 

 Philodina. — Body smooth, eyes oval, horn-like processes 

 of the foot short. " I have observed," says Ehrenberg, 

 " that this animalcule, when kept in glasses, deposits its 

 eggs in heaps, and the parent remains a long time with the 

 young ones produced from them, forming a sort of family 

 or colony, and which we are not to be hindered from 

 ascribing to a seme of company or family, though the pride 

 of man may laugh at it." Fig. 490 represents one with 

 the wheels extended. Length l-72nd to l-48th. 



701. Philodina collaris. The collar Philodina is hya- 

 line, or white, body smooth, eyes round, a prominent 

 annulus or collar is round the neck. It is especially 

 characterized by the breadth of the alimentary canal, and 

 coecal appendages attached to it, so that, when the ani- 

 malcule is fed upon indigo, it appears like a polygastric 

 animalcule. Length 1-1 20th. 



702. Philodina macrostyla. The long-horned Philo- 

 dina is white and smooth, with oblong eyes ; it has three 

 teeth in each jaw, and the horn-like processes of the base 

 of the foot are long. Found amongst oscillatoria. Length 

 l-70th. 



703. Philodina citrina. The yellow Philodina. — Body 

 smooth, citron coloured in the middle, extremities white, 

 eyes variable in form, horn-like processes slightly elongated. 

 Found amongst oscillatoria. Length l-70th. 



704. Philodina aculeala. The spinous Philodina. — 



