MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 499 



Family 3. Dysteriidae Clap, and Lach. 1858. 

 4. Ciliated right area of ventral surface 



entirely free Genus Trochilia Dujardin 



Ciliated right area with mouth, in furrow by 

 overgrowth of right ventral surface 



Genus Dysteria 



(= Cypridium Kent; 

 Ervilia Duj.; Aegyria 

 C. and L.) 

 Family 4. Pycnothricidae Poche 1913 (= Nicollellidae Chatton and 

 Perard ) . 



1. Mouth in mid-ventral surface Genus Nicollella Ch. and Per. 



Mouth otherwise placed 2 



2. Mouth at posterior end of body. . . .Genus Collinella Ch. and Per. 

 Mouth dorsal; furrow runs around poste- 

 rior end 3 



3. Mouth near posterior end Genus Buxtonella Jameson 



Mouth near anterior end Genus Pycnothrix Schubotz 



Family 5. Foettingeriidae Chatton and Lwoff 1926. 



1. Body with pigmented reserve mass 2 



Body without pigmented reserve mass. ... 3 



2. Chains of buds formed without encystment 



Genus Polyspira Minkiewicz 

 Chains of buds formed while encysted 



Genus Gymnodinioides Min. 



3. Gastric parasites of Actinians; stalked 



cysts in Crustacea Genus Foettingeria Clap. 



No stalked cysts 4 



4. Motile forms in Hydromedusae; cysts in 



Copepods Genus Spirophrya 



Clap, and Lach. 

 Motile forms and cysts in crabs. . . .Genus Synophrya 



Chat, and Lwoff 



Order 3. Trichostomida Butschli 1889. 



Key to Fain Hies 



1. Gelatinous test or cup absent 2 



Gelatinous test present, animals swim 



backwards Family 8. Marynidae 



2. Small, mostly flattened laterally, with deli- 



cate armor-like periplast; cilia sparse, 

 chiefly on right surface in 2-9 broken 

 rows on semicircular or crescentic keel; 

 mouth on compressed ventral surface 

 with obscure membrane-like structures 



Family 9. Trichopelmidae 

 Structures and ciliation different 3 



3. Small to very small ciliates with long cau- 



dal cilium, cilia reduced to 3-4 cross 

 spiral rows about anterior half . Family 1 . Sciadostomidae 

 Ciliation otherwise; no caudal cilia 4 



4. Zone of special cilia extends from mouth 



to posterior end 5 



Spiral zone of special cilia absent 6 



