Monadina.^ infu3orial animalcules. 125 



MoNAs scintillana. The sparkling spindle Monad. — Very active. 

 Vacillating motion. Found amongst fresh water confervae, &c. Size 

 l-eOOOth to l-4600tli. 



M. Lumalii. — Of a deep red colour : they occur in vast numbers 

 in the saltmarsh-Tvater of the Mediterranean, to which they give a 

 deep blood colour. Discovered by M. Joly. 



M. prodigiosa. — A very minute red Monad, so named by Ehrenberg, 

 from its siu-prisingly rapid development. It is this animalcule 

 which has produced the blood-like spots occasionally appearing 

 mysteriously on bread and other farinaceous substances, and which 

 have ever been a cause of terror to the supcrstitioiis. 



Being desu'ous of making this manual as complete as possible, the 

 following species, described by M. Dujardin, are inserted ; but it may 

 be that some of them refer to monads ah'eady characterized, but 

 differently named. 



M. lens. — Figiu'e rounded or discoid ; sm-face in appearance tuber- 

 cular. Size 1 -5200th to 3-5 200th. Tliis species, one of the most 

 frequent in animal or vegetable infusions, has been recognised by 

 most of the ancient micrographers. It sends out obliquely a flagel- 

 liform filament, three, four, or even five times as long as the body, 

 and mobile in all its length. 



M. concava. — Body circular, concave on one side, thin in the 

 centre, margin tumid. Filament long, moveable throughout. Found 

 in marsh water, Toulouse, 1 -2080th. 



M. glohdosus. — Body globular ; fonn mostly constant; compressed 

 at origin of filament ; more globular than M. lens, and its surface 

 smooth. Found in sea water at Cette, France. Size 1 -2000th. 



M. elongata. — Body elongate ; nodular, flexible, of variable form. 

 Length l-1200th. Found in marsh water. 



M. (dtenuata. — Body ovoid, tapering at each extremity, nodular, 

 vaculse large and distinct, as is also its filament. Size l-1660th. 



M. ohlonga. — Body ovoid, oblong, unequal, tubercular, hollowed 

 by vacuolae. Size 1 -3600th. Found in vegetable infusions. 



M. nodosa. — Body oblong, irregular, nodose, tapering behind, 

 truncate in front, filament arising from centre of truncate extremity. 

 Size 1-21 70th. Found in sea water at Cette, France. 



M. gihhosa. — Body oblong, angular, irregularlv distended and 



