342 BIOLOGY OF THE PROTOZOA 



With gelatinous mantle; no silicious spicules 



Order 2. Chlamydophora 



With isolated or united spicules Order 3. Chalarothoraca 



Skeleton globular; silicious; many openings 



Order 4. Desmothoraca 



Order 1. Aphrothoraca, Hertwig. 



1. Individuals without stalk 2 



Individuals with stalk 5 



2. Ectoplasm and endoplasm distinct 4 



Ectoplasm not distinctly differentiated. . . 3 



3. Axial filaments extend to central nucleus 



Genus Adinophrys 

 Each axial filament ends in a nucleus 



Genus Cam.ptonema 



4. Axial filaments end with ectoplasm . Genus Adinosphcerium 

 Axial filaments end in centroblepharoplast 



Genus Gymnosphcera 



5. Stalk contractile Genus Zooteim 



Stalk not contractile 6 



6. Stalk hollow Genus Adinolophus 



Stalk solid Genus Haeckelina 



Order 2. Chlamydophora, Archer. 



1. Mantle without foreign bodies 2 



Mantle with foreign bodies 3 



2. Mantle granular; radial surface markings 



Genus Heterophrys 

 Mantle smooth; radiating fibrils; rough 



Genus Sphcerastrum 



3. Plasm with colored oil globules . . . .Genus Eleorhanis 

 No oil ; mantle with one layer of sand grains 



Genus Lithocolla 



Order 3. Chalarothoraca, Hert. and Less. 



1. Without stalk 2 



With stalk 3 



2. Membrane with minute spherical granules 



Genus Pompholyxophrys 

 Membrane watla circular discoidal plates 



Genus Pinacocystis 

 Membrane with {pointed oval plates. Genus Pinaciophora 

 Membrane wath tangential, loose, needles 



Genus Raphidiophrys 

 Membrane with radiall.y arranged spines 



Genus Acanthocystis 



'3. Membrane with small plates Genus Cienkowskya 



Membrane with radial spines Genus Wagnerella 



Order 4. Desmothoraca, Hert. and Less. 



1. With stalk 2 



Without stalk 3 



2. Capsule sphei-ical; openings large. . .Genus Clathrulma 

 Capsule polygonal; openings small. .Genus Hedriocystis 



3. Capsule spherical; pores with collars Genus Choanocystis 

 Capsule spherical; no collars Genus Elaster 



