Moiiadiiia.] THE infusoria. 105 



l)ular ; 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; 

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

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

 Monas termo, but its brisk leaping movement will suffi- 

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



52. Bodo fp'andis. 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 

 Ijody; 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 1 -2000th, 



