MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 523 



Family 2. Chilodochonidae Poche. 



One genus — Chilodochona Wallengren. On 

 mouth parts of crabs (Ebalia and Portunas) 



Class II. SUCTORIA Butschli. 



1 . Suctorial tentacles alone present 2 



Prehensile tentacles in addition to suctorial 



Family Ephelotidae 



2. Body not bilaterally symmetrical; irregular 



or branched 3 



Body monaxial; more or less bilateral. ... 5 



3. Without "proboscis" or special "arms" 



Family Dexdrosomidae 

 With retractile proboscis or special "arms" 4 



4. With retractile proboscis Family Ophkyodexdridae 



With special, tentacle-bearing "arms" 



Family Dendrocometidae 



5. Reproduction by internal budding 6 



Reproduction by external budding- 

 Family Podophryidae 



G. Pellicle delicate Family Acinetidae 



Pellicle tough, coriacious Family Discophryidae 



Family 1. Acinetidae Butschli. 



1 . Internal parasites 2 



External parasites or free-living 3 



2. In other Protozoa; no tentacles or suckers 



Genus Endosphaera Engelm. 

 Horse parasites; with tentacles at opposite 

 ends of body Genus Allantozoon Gassovsky 



3. Parasitic on other suctoria 4 



Not parasitic on suctoria; or free-living. . . 5 



4. Stalk embedded in Acineta or Paracineta 



Genus Pseudogemma Collin 

 Parasitic on Ephelota Genus Tachyblaston Martin 



5. Twelve to 15 finger-form processes, each 



with sucker Genus Dactylophrya Collin 



Without finger-form processes 6 



(5. Test or cup absent; tentacles in fascicles. . 7 

 Test or cup present 8 



7. Body pyramidal, with stalk (Fig. 117, p. 



228) Genus Tokophrya Butschli 



Form variable; no stalk Genus Halleziu Sand 



8. Test without free margin, membrane-like 



(Fig. 100, p. 192) Genus Acineta Ehr. 



Test cup-like, with free rim or margin .... 9 



9. Xo definite stalk; test attached by base. . . 10 

 Test attached by definite stalk 11 



10. Cup attached by entire base Genus Solevophrya 



Clap, and Lach. 

 Base of cup narrowed, almost stalk-like 



Genus Periacineta Collin 



11. Gup polyhedral; 1 to 6 central tentacles 



Genus Acinetopsis Robin 

 ( !up not polyhedral: distributed apical ten- 

 tacles Genus Tkecacineta Collin 



