MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 495 



Family 6. Spathidiidae Kahl 1930. 



1. Mouth region not surrounded by tricho- 



cyst-bearing swelling; nor with tricho- 



cyst-bearing papillae nor tentacles 2 



Mouth ventral, unciliated stripes, or papil- 

 lae or tentacles with trichocysts present . 9 



2. Mouth without papilla on its dorsal end; 



nor surrounded by three tentacle-like 



arms ; occasional processes 3 



Mouth dorsal, with three arms or with 

 trichocyst-bearing warts 8 



3. Trichocysts of mouth region not heaped in 



single bundle 4 



Trichocysts in bundle on dorsal part of 

 mouth region Genus Cranotheridium Schew. 



4. Body normally ciliated on both sides 5 



Body long, worm-like; ciliated on right 



side only Genus Homalozoon Stokes 



5. Mouth area closed in front 6 



Mouth area open Genus Enchelydium Kahl 



6. Small, hyaline, with firm pellicle; with 



snout-like process Sub-genus Spathidiella Kahl 



Structures otherwise 7 



7. From the mouth area to middle of body an 



unciliated piece about which the cilia 



run concentrically Genus Balantidiodes Penard 



Ventral side without unciliated piece; cilia 

 meridional Genus Spathidium Dujardin 



8. Mouth area with trichocyst-bearing warts 



Genus Spathidiodes Brodsky 

 Mouth surrounded by 3 trichocyst-bearing 



arms Genus Tmthophrys 



Chatton and Beauchamp 



9. No tentacles nor warts; mouth area ventral 



with trichocysts 10 



Body with trichocyst-bearing warts or ten- 

 tacles Genus Legendrea Faure-Fremiet 



10. Body ridge runs spirally to posterior right . 1 1 



Body ridge meridional Genus Penardiella Kahl 



11. Anterior end with oblique ventral angle; 



2 anterior horns absent Genus Perispira Stein 



Anterior end drawn out into 2 horns . Genus Diceras Eberhard 

 Family 7. Biitschliidae Poche 1913. 



1 . Entire body uniformly ciliated 2 



Body not uniformly ciliated 5 



2. Spiral groove from cytostome to posterior 



end Genus Paraisotrichopsis 



Gassowsky 

 No spiral groove 3 



3. Cilia beat in uniform fashion 4 



Cilia divided into 3 zones by 2 transverse 



bands of cilia which beat at different 



intervals Genus Blepharozoum Gassowsky 



4. Cytopharynx at anterior end which is 



slightly bent Genus Prorodonopsis Gassowsky 



Anterior end straight, cytostome large 



Genus Holophryoides Gassowsky 



