CRYPTODIFVLUGIA. 5] 
“In this form also the organism, at the time of 
gamete-formation, quits its shell and penetrates into 
some other Protozoan organism, such as Amcela 
proteus, in the body of which it becomes parasitic 
and goes through the process of gamete-formation. 
The nucleus breaks up into chromidia, from which 
secondary nuclei are. formed, producing a multi- 
nucleate plasmodium which multiplies by plasmotomy 
until the host is full of them. Ultimately the 
plasmodia break up into uninucleate cells, the 
gametes, which are set free and copulate. The 
‘zygote becomes a flagellated Rodo-like organism, 
with two flagella, one directed forward, the other 
backward as a trailing flagellum; it feeds and 
multiplies in this form for several generations in the 
free state, but ultimately it loses its flagella, becomes 
amoeboid, forms a shell, and develops into an adult 
Cryptodifiugia. Noteworthy in this development are 
the alternation of generations between the flagellated 
and the amceboid phase, as in Pseudospora, and the 
parasitism in the gamete-forming phases; if, however, 
the Cryptodifflugia does not succeed in finding a 
suitable host, the gamete-formation may take. place 
in the free state,” 
As only one species (C. ovifor nis) belonging to this 
genus has been described by Cash, and three other 
species are now recorded, a synopsis of the genus is 
here given : 
Section A. ‘lest smooth, usually compressed. 
Test oviform, slightly compressed ; ae circular, 
terminal. (1) ¢. oviformis. 
Test oviform, much compressed; aperture elliptical, 
terminal. (2) C. compressa. 
Test elongate, slightly compressed; aperture circular, 
oblique. (3) C. eboracensis. 
Section B. Test usually with adherent foreign particles. 
‘lest pyriform, not compressed ; aperture circular, terminal, 
enlarged. (4) C. sacculus. 
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