114 NATURAL HISTORV 



GENUS XII. 

 LEUCOPHRYS. 



DIAPHANOUS, CILIATED ANIMALCULES. 



202. Leucophrys constrictor. — This animalcule is 

 globular, and resembles the Vohox glohator (37) : it is of 

 a yellow colour, with its interior filled with several small 

 vesicles, which are generally in a state of agitation. 

 When the water is disturbed or nearly evaporated, the 

 body appears covered with short delicate hair, and the 

 creature becomes elongated ; it seldom swims, but turns 

 round, first to the right and then to the left, and so pro- 

 ceeds in a zig-zag course. 



203. Leucophrys mamzV/a. The nipple Leucophrys, — 

 This animalcule is drawn at figure 128 ; it is spherical, 

 and rather opaque: the mouth resembles a papillary 

 projection, which it can withdraw at pleasure. Found 

 in standing water in marshes. 



204. Leucophrys viriscens. The dull green Leuco^ 

 phrj/s is rather larger than the next species ; its form is 

 shewn at figure 127. The body can be elongated or con- 

 tracted at pleasure ; it is covered with hair ; in its interior 

 may be observed polygastric sacs ', it swims in a direct 

 course. Found in sea-water. 



