SPECIAL MORPHOLOGY AND TAXONOMY OF INFUSORJA 399 



The following genera are naked: 



1. Podophn/a, normally with stalk, and attached (Fig. 91, 

 p. 185). 



2. SphoBwphri/a, without stalk, free-swimming (suspended) or 

 parasitic. 



The following genera are provided with tests: 



3. Paracineta, with close-fitting delicate test, rim invisible. 



4. Metacineta, with coarse test, rim distinct, tentacles in fascicles. 



5. Urmda, with coarse test, rim distinct, tentacles 1 to 3 in 

 number. 



Family 2. Acinetidse. — In these forms also the body is monaxonic 

 tending to bilateral s\mmetry. Tentacles of one type only (suc- 

 torial) are present and the individuals are either naked or enclosed 

 in cups or tests, and are with or without stalks. Reproduction is 

 by division or by internal or endogenous budding. Frequently ecto- 

 parasitic on the gills of fresh or salt water animals, or on other 

 Protozoa; some forms are endoparasites, and are devoid of stalks 

 and tentacles. 



The following genera are parasitic: 

 1 . Endosphcpra, without stalk or tentacles; endoparasitic in other 

 Protozoa. 



2. Tachyhlasion, ectoparasitic on Ephelota. 



3. Pseudogemma, ectoparasitic, stalks embedded in Acineta or 

 Paracinda. 



The following genera are free-living; attached; with or without 

 stalk. 



4. Dadi/Iophora, with 12 to 15 finger-form processes each with 

 sucker. 



5. Tokophrya, tentacles in fascicles; body in form of inverted 

 pyramid. Stalked. 



6. Halleria, tentacles in fascicles; form variable; no stalk. 



7. Acineta; with membrane-like test without free margin; ten- 

 tacles anterior. 



S. Solenophrya, test cup-like with free margin; attached by base 

 of cup. 



9. Periaciueta; test cup-like, attached by narrowed, stalk-like 

 base. 



10. Acinetopsis; cup polyhedral with stalk, 1 to 6 central ten- 

 tacles. 



11. Thecacineta; test with free margin, stalked, tentacles apical 

 and distributed. 



Family 3. Discophryidse, — In these forms the pellicle is coriacious 

 and tough as distinguished from the delicate pellicle of the pre- 

 ceding family which they resemble in other respects. lieproduction 

 is by endogenous budding. The tentacles may be greatly reduced 

 in number and variable in form, some with expansile suctorial tips, 

 others with swollen bases. 



