MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 299 



3. Not laterally compressed. . . .Sub-family 2. Chromulinix.e 

 Cell laterally compressed. . . .Sub-family 3. Sphalero.maxtix.e 



4. Test delicate; only partly filled 



Sub-family 4. Lepochromulinin.e 

 Test thick; spherical; close-fitting 



Sub-family 5. Kytochromulixix.e 

 Sub-family 1. Cyrtophorince 



1. With contractile stalk 2 



No stalk; cells in anterior third of test 



Genus Palatinella 



2. Tentacles much shorter than the flagellum 



Genus PedineUa 

 Tentacles much longer than the flagellum 



Genus Cyrtophora 

 Sub-family 2. ChromuUnince 



Circular in optical cross-section Genus Chromulina 



PjTamidal; triangular in cross-section . . Genus Pyramidochrysis 

 Sub-family 3. Sphaleromantince 



With characteristics of the sub-family, one 



genus Genus Sphaleromantis 



Sub-family 4. Lepochromidinince 



1 . Free-swimming 2 



Attached 3 



2. Test with wide opening Genus Kephyrion 



Test calcareous with pores for fine pseudo- 

 podia Genus Porochrysis 



3. Test without "straddling" processes . Genus Lepochromulina 

 Test with two straddling arms; attached to 



alga? Genus Chrysopyxis 



Sub-famil}^ 5. Kytochromulinince 



One genus with characters of the sub-family 



Genus Chrysococcus 

 Tribe 3. jMallo.moxadid.e 

 Family 1. Mallomonadidse. 



1 . Solitary forms 2 



Colonial; in jelly; two spines from each cell 



Genus Chrysosphcerella 



2. Pellicle close-fitting, soft Genus Microglena 



Pellicle rigid; with silicious plates and 



needles Genus Mallomonas 



Family 2. Isochrysidae. 



Without close-fitting sculptured pellicle 



Sub-family 1. Isochrysix.e 

 With close-fitting sculptured pellicle 



Sub-family 2. Euhymenomonadix.e 

 Sub-family 1. Isochrysince 



1. Without test; colonial in jelly; free swim- 



ming Genus Syncrypta 



With test 2'^ 



2. Short stalk or none; often with test par- 



tition Genus Derepyzis 



Long stalk and test Genus Stylochrysalis 



Sub-family 2. Euhymenotnonadince 



1. Solitary forms Genus Hymenomonas 



Colonial forms 2 



2. Globular colonies; cells radially arranged 



Genus Synura 



