Kolpodea.] THE INFUSORIA. 311 



ramecium. Body oblong and cylindrical, equally rounded 

 at both ends, cilii about the mouth very long. This spe- 

 cies, like P. aurelia, is often developed in such vast myriads 

 that the water has a milk-like hue, the animalcules swarm- 

 ing like gnats, the masses ascending or descending in the 

 fluid : this appearance may be produced by slightly shaking 

 the water. Found in infusions and in salt water. Size 

 l-240thto 1-1 90th. 



513. PABAMECIUM kolpoda (Kolpoda ren, M.) The 

 bosom Paramecium. Body ovate, slightly compressed, 

 ends obtuse, the anterior attenuated and slightly bent like 

 a hook. Found especially in infusions of Urtica droica. 

 Size l-240th. 



514. PARAMECIUM (?) Sinaiticum. The Paramecium of 

 Sinai. Body elliptical, compressed, the back and under 

 side carinated ; frontal cilii indistinct. Found, amongst 

 conferva, in a brook at Mount Sinai. Size 1 -288th. 



515. PARAMECIUM (?) ovatum. The egg-shaped Para- 

 mecium. Body ovate, turgid, anterior attenuated and 

 rounded. Found in stagnant river water. Size 1 -288th. 



516. PARAMECIUM compressum (Paramecium aurelia, 

 M.) The flat Paramecium. Body elliptical or reniform, 

 compressed. It has an oblique wreath of long cilii reach- 

 ing to the middle, where the mouth, with its slight tongue- 

 like process, is situated. Found in the river muscle (My a). 

 Size 1 -240th to l-210th. 



517. PARAMECIUM milium (Cyclidium milium, M.) 

 The millet Paramecium. Body small, oblong, trilateral, 

 rounded equally at the ends. In coloured water the body 

 is seen vibrating. Size 1-1 150th. 



Genus CXXII. AMPHILEPTUS. The double-necked 



