SPECIAL MORPHOLOGY AND TAXONOMY OF INFUSORIA 413 



3. Body not bilaterally symmetrical; irregular 



or branched 4 



Body monaxial ; more or less bilateral 6 



4. Without "proboscis" or special "arms" 



Family Dendrosomid.e 

 With retractile proboscis or special "arms" 5 



5. With retractile proboscis Family Ophryodendrid.e 



With special, tentacle-bearing "arms" 



Family Dendrocometid.e 



6. Reproduction by internal budding 7 



Reproduction by external budding . Family Podophryid.e 



7. Pellicle delicate Family Acinetid^ 



Pellicle tough, coriacious Family Discophryid.e 



Family Actinetidae. 



1. Internal parasites (no stalk; no tentacles) 



Genus Endosphcera 

 External parasites or free-living 2 



2. Parasitic on other suctoria 3 



Not parasitic on suctoria; or free-living. . . 4 



3. Stalk embedded m Acmeta or Paracineta 



Genus Pseudogemma 

 Parasitic on Ephelota Genus Tachyblaston 



4. Twelve to fifteen finger-form processes, 



each with sucker Genus Dadylophora 



Without finger-form processes 5 



5. Test or cup absent; tentacles in fascicles.' 6 

 Test or cup present 7 



6. Body pyramidal, with stalk (Fig. 112, p. 



231) Genus Tokophrya 



Form variable ; no stalk Genus Hallezia 



7. Test without free margin, membrane-like 



(Fig. 91, p. 185) Genus Acineta 



Test cup-like, with free rim or margin. ... 8 



8. No definite stalk; test attached by base. . . 9 

 Test attached by definite stalk 10 



9. Cup attached by entire base Genus Solenophrya 



Base of cup narrowed, almost stalk-like 



Genus Periacineta 

 10. Cup polyhedral; one to six central tentacles 



Genus Acinetopsis 

 Cup not polyhedral; distributed apical ten- 

 tacles Genus Thecacineia 



Family Discophryidse. 



1. One primary tentacle; with or without 



secondaries 2 



With many tentacles 3 



2. With stalk Genus Rhynchophrya 



No stalk; attachment by protoplasmic 



body Genus Rhynchela 



3. Suctorial tentacles conical, with enlarged 



bases Genus Thaumatophrya 



Tentacles uniform in diameter 4 



4. Tentacles expansile at extremities for food- 



taking Genus Choanophrya 



Tentacles not expansile Genus Discophrya 



