358 BIOLOOY OF THE PROrOZOA 



3. Chitinoiis test covered by foreign bodies 



Family 2. Difflugiid^ 

 Chitinous test with plates made by organ- 

 ism Family 3. Euglyphid^ 



Family 1. Arcellidse. 



1. Tests meniljranous and flexible 2 



Tests membranous; rigid; with or without 



foreign bodies 9 



2. Test like inverted watch-glass; aperture 



full diameter 3 



Test cup-like or sac-like 4 



3. Test with hyaline margin (Fig. 153.) Genus Pseudochlamys 

 Tests completely hyaline Genus Pyxidicula 



4. Tests cup-like 5 



Test bag or sac-like 7 









•-.~*'^'--r-»-^„.,.^ 





\x. 



'-•7 



K 



Fig. 153-. — A, Hyalosphenia? sp. (Original,) B, Pseudochlamys patella after Clap 



and Lachm. 



5. Margin of test aperture turned in 6 



Test aperture with diapliragm-like mem- 

 brane Genus Diplochlamys 



6. Cell body uninucleate (Rhogostoma) Genus Arnphizonella 

 Body with more than one nucleus . . Genus Zonomyxa 



7. Crown of test with circular and radial 



ridges Genus Microcorycia 



Crown of test simple; aperture an elastic 

 slit 8 



8. Test non-encrusted ovoid sac; aperture 



linear Genus Capsellina 



Test sac-like, covered with foreign bodies 



Genus Parmulina 



9. Test rigid; chitinous; without foreign 



bodies 10 



Test more or less plastic ; one or more pores 



Genus Cochliopodium 



