SPECIAL MORPHOLOGY AND TAXONOMY OF INFUSORIA 411 



Family 4. Psilotrichidae, Biitschli. 



Heavy bristle-like marginal; one row ventral 



cirri Genus Balladina 



Irregularly scattered cirri (Fig. 176) . . . Genus Psilotricha 

 Family 5. Euplotidae, Ehrenberg, Stein. 



1. No special anal or frontal cirri; seven to 



nine posteriors (Fig. 107, p. 225) . Genus Uronychia 

 With five large anal cirri 2 



2. Three posterior giant cirri; seven to eight 



frontal-ventral cirri Genus Diophrys 



No giant cirri ; more than eight ventral cirri 3 



3. Eleven cirri on left margin; eleven frontal- 



ventrals Genus Certesia 



Four cirri on posterior margin; nine to ten 



f rontal-ventrals Genus Euplotes 



Family 6. Aspidiscidae, Stein. 



The peristome begins at the anterior end 



Genus Aspidisca 

 The peristome begins at center of the left edge 



(Fig. 80, p. 152) Genus Onychaspis 



Order V. PERITRICHIDA, Stein. 



1. With spirally rolled peristome. . .Family 1. Spirochonid.e 

 Peristome not spirally rolled 2 



2. Ectoparasites; attachment posterior end, 



flexible Family 2. Lichnophorid.e 



Not parasitic , posterior end not flexible 



Family 3. Vorticellid^ 



Family 1. Spirochonidse, Stein. 



Stalked, membrane about joint of stalk Genus Chilodochona 

 With or without stalk, joint without mem- 

 brane Genus Spirochona 



Family 2. Lichnophoridae, Biitschli. 



One genus with characters of the Family 



Genus Lichnophora 

 Family 3. Vorticellidse, Ehrenberg, emend Butschli. 

 No peristomial trench, attaching disc ciliated 



Sub-family 1. Urceolarin^ 

 With peristomial trench, posterior cilia tem- 

 porary Sub-family 2. Vorticellin.e 



Sub-family 1. Urceolarin.e. Butschli. 



1. Surface of body covered with cilia. .Genus Trichodinopsis 

 Surface not covered with cilia 2 



2. Erect bristles outside posterior girdle of 



cilia Genus Cyclochceta 



No bristles in addition to posterior cilia 



Genus Trichodina 

 Sub-family Vorticellin^e. Biitschli. 



Cells with contractile stalks Tribe Contractilia 



Cells without contractile stalks Tribe Acontractilia 



Cells in tests or houses Tribe Cothurnina 



