Monadina.] THE INFUSORIA. 105 



bular ; tail very short; colour green. Found amongst 

 conferva. Size 1 -2400th. 



48. BODO socialis. (Monas lens, M.) The social Bodo. 

 Form ovate or subglobose; tail often longer than the 

 body; transparent and colourless. Clusters into a mul- 

 berry shape. The single forms are sometimes observed 

 hopping. Very common in stagnant water. Size l-2970th. 



49. BODO vorticellaris. The bell-shaped Bodo. Bodv 

 three times as long as it is broad ; tail very short. Found 

 in fresh water. Size 1-1 200th. 



50. BODO didymus. The double-tailed Bodo. Body 

 generally constricted about midway, tail short. Size 

 1 -9600th. 



51. BODO saltans. The leaping Bodo. Very small; 

 body with ample ventricles ; tail short. This creature, most 

 probably from its small size, has been mistaken for Miiller's 

 Monas termo, but its brisk leaping movement will suffi- 

 ciently distinguish the one from the other. Size 1-1 2000th, 



52. BODO grandis. The great Bodo. This creature has 

 an oblong form, ample ventricles, and rigid setaceous tail, 

 affixed to the abdomen. Found in stagnant water. Size 

 l-864th. 



53. BODO oystea. The oyster Bodo. Has a globular 

 body; the anterior three-fourths occupied with vescicles, 

 the rest hyaline ; length of tail four times the diameter of 

 body. This active creature I discovered in the liquor of an 

 oyster, swimming freely among the ova (Sept. 1834). 

 Diameter I -2000th. 



