510 BIOLOGY OF THE PROTOZOA 



Family 1. Metopidae Kahl 1927. 



4. Cilia of head reduced to lateral zone and 



dorsal cirri 5 



Cilia of head reduced to lateral zone and 

 about 8 fused cilia Genus Twchella Penard 



5. One or two rows of dorsal cirri Genus Caenomorpha Perty 



Two single, long cirri Genus Ludio Penard 



Family 2. Reichenowellidae Kahl 1031. 



1. Elongate, sapropelic, fresh water; C. V. 



terminal; ciliation meridional. . . .Genus Reichenowella Kahl 

 Oval; moss dwelling; C. V. numerous; cili- 

 ation spiral Genus Balantidioides Penard 



Family 3. Spirostomidae S. Kent, 1881. 



1. No undulating membrane at mouth 2 



An undulating membrane on right edge of 



peristome 7 



2. Worm-like; contractile 3 



Not definitely contractile 4 



3. Usually fresh water; greatly twisted on 



contraction Genus Spirostomum Ehr. 



Salt water forms; posterior tail-like; very 



little torsion on contraction Genus Gruberia Kahl 



4. Elongate fresh water forms; 2 rows of cilia 



in place of undulating membrane . Genus Pseudoblepharisma Kahl 

 Fresh water forms ; not elongate 5 



5. Oval; with marked ribs; in moss. . . .Genus Phacodinium Prowazek 

 Small, oval, marine forms; without notice- 

 able ribs 6 



6. Adoral zone spirally rolled at mouth. Genus Spirostomina Gruber 

 Adoral zone runs directly to mouth. .Genus Protocrucia da Cunha 



7. Peristome-bearing region not narrowed 



neck-like; no gelatinous membrane 



Genus Blepharisma Perty 

 Peristome narrowed neck-like; gelatinous 



membrane; marine forms Genus Parablepharisma Kahl 



Family 4. Plagiotomidae Poche 1913. 



Elongate, oval; peristome begins at ante- 

 rior end; earthworm gut Genus Plagiotoma Dujardin 



Oval to reniform; peristome beginning sub- 

 terminal; many hosts (Fig. 200) . Genus Nyctotherus Leidy 

 Family 5. Condylostomidae Kahl 1031. 



Only one genus— Condylosloma Bory (Fig. 206) 

 Family 6. Stentoridae Cams 1863. 



1. Adoral zone almost completely closed 



circle; body contractile, "trumpet" ani- 

 mal Genus Stentor ( )ken 



Adoral zone not complete ring; not con- 

 tractile 2 



2. Right peristome edge drawn down ventral 



surface Genus Climacostomum Stein 



Right peristome edge continuous with 



right anterior edge of body ( ionus Fabrea Henneguy 



Family 7. Folliculinidae Dons 1*012. 



1 . Neck of test not swollen 2 



Neck has a basal swelling; tests fastened 



laterally or on end Genus Parafolliculina Dons 



