THE FLAGELLATEH INFUSORIA, 33 
The first sign of fission is a bulging out of the collar, 
which becomes still more bell-shaped. The flagellum next 
disappears. ‘Then marks of self-division appear in a nar- 
row, slight furrow (Fig. 21, B, e), extending from the front 
half way back along the middle of the body. Meanwhile 
the collar, which had become conical, expands, and, most 
striking change of all, two new flagella appear. Then the 
collar splits into two (Fig. 21, C’), and svon the two new Codo- 
sige become perfected, when they split asunder, and become 
like the original Codosiga. Such is the usual mode of mul- 
tiplication of the species in the monads. 
A-few monads have been observed to become encysted, and 
to break up into excessively minute bodies, from which new 
monads have grown. Two 
individuals of the same form ,.\O]-n 
(Heteromita) in certain stages 
fasten themselves together, 
the larger absorbing the 
smaller as if conjugating, 
like Desmids, the compound 
-body resulting becoming en- 
cysted ; finally the contents 
of the cyst become divided _| ‘ i 
into either large or minute Pee meena pee Dm eden 
germs (2 o0sp ores) which as- us. Greatly magnified.—After Cienkowski. 
sume the parent form. The researches of Messrs. Dallinger 
and Drysdale on Dallingeria Drysdali prove that while 
the mature forms may be destroyed at a temperature of 
142° F., the motile germs of this and five other species of Infu- 
soria perished when heated in fluid to from 212° F. to 268° F, 
Noctiluca (Fig. 22) has been proved by Cienkowski to be 
an enormous monad. It is a highly phosphorescent organ- 
ism, so small as scarcely to be seen with the naked eye, be- 
ing from $ to 1 mm. (‘01 to 04 inch) in diameter. It occurs 
in great numbers on the surface of the sea. It has a nearly 
spherical jelly-like body, with a groove on one side from 
which issues a curved filament, used in locomotion. Near 
the base of this filament is the mouth, having on one side a 
tooth-like projection. Connecting with the mouth is an ces- 
