MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 503 



Family 10. Conchophthiriidae Reichenow-Doflein 1929. 



2. Body much flattened laterally 3 



Body slightly flattened; mouth posterior; 



oral groove narrow triangle; limpet par- 

 asite Genus Eupoterion MacLennon 



3. Mouth in anterior third; oral groove S-like; 



eehinoderm parasite Genus Cryptochilum Maupas 



Mouth median ; oral groove straight . Genus Conchophthirius Stein 

 Family 11. Hypocomidae Butschli 1889. 

 1. Adoral cilia apart from attaching tentacle 



Genus Hypocoun'des 



Ch. and Lwoff 

 Adoral cilia absent; attaching and food- 

 taking tentacle Genus Hypocoma Gruber 



Family 12. Boveriidae Pickard 1927. 



1. Circum oral spiral begins part way up the 



body Genus Plagiospira Issel 



Circum oral cilia around oral end . . . Genus Boveria Stevens 

 Family 13. Ancistrumidae Issel 1903. 



One gemts—Ancistruma Strand (Ancistrum Maupas pre-occupied) 

 Family 14. Isotrichidae Butschli 1889. 



1. Protoplasmic strands from cortex support 



the macronucleus Genus Isotricha Stein 



Protoplasmic strands from cortex absent 



Genus Dasytrieha Schuberg 

 Family 15. Paraisotrichidae da Cunha 1916. 



One genus — Paraisotricha Fiorentini 

 Family 16. Blepharocoridae Hsiung 1929. 



1. Anal cilia in a single group Genus Blepharocorys Bundle 



Anal cilia in two groups ( icnus < 'haron Jameson 



Family 17. Cyathodiniidae da Cunha 1916. 

 One genus — Cyathodinium da Cunha 



Order 4. Hymenostomida. 



Key to Families 



1 . With aboral thigmotactic cilia (commen- 



sals) Family 6. Hemispeiridae 



Without attaching cilia 2 



2. Oral pit not connected with a peristome 



Family 1. Frontoniidae 

 Oral pit at end or at bottom of a peristome . 3 



3. Mouth at bottom of sickle-shape, ciliated 



peristome sunk at right angles to body 



surface Family 2. Ophryoglenidae 



Mouth at end of peristome running from 

 anterior pole on body surface 4 



4. On right edge of peristome a one-layered 



membrane which forms a pocket sur- 

 rounding posterior mouth, on left edge a 

 row of cilia or a membrane . . . Family 5. Pletjronematidae 

 Peristome otherwise 5 



