246 UNIVERSITY OF COLORADO STUDIES 



(80) Stylonychia Ehrenberg. Eight frontal, five ventral and five caudal styles. Our 

 species has not been determined. 



Family EUPLOTn).ffi 



Oval, dorsal surface convex; caudal styles usually well developed, but the others 

 often reduced in number or lacking. 



(81) Euplotes Ehrenberg. Seven frontal styles, three ventral and several caudal 

 in our species. E. charon (Miiller)*; broad oval, about 80 m long. 



(82) Aspidisca Ehrenberg. Resembling Euplotes; no caudal setae. 

 A. costala (Dujardin).* Length 35 /x. 



Order PERITRICHIDA 



Ciliata usually of cylindrical or cup-like form, in which the cilia are reduced, as a 

 rule, to those which form the adoral zone, but secondary rings of cilia may be 

 present (Calkins). 



Family VORTICELLIDiE 



Attached or unattached; the adoral zone, seen from above, forms a dextral spiral. 



Subfamily VORTICELLIN^ 



With no permanent secondary circlet of cilia. 



(83) Epistylis Ehrenberg. Zooids bell-shaped, on a branching stem, which does not 

 contract. E. plicatilis Ehr.* 



(84) Vorticella Linne. More or less bell-shaped, with an elongate contractile 

 stalk. V. campanula Ehr.*; V. alba From.*; V. telescopa S. Kent.* 



Class SUCTORIA 



Cilia, except in a very few cases, absent in adult; there are tentacles of various 

 kinds, some for sucking, some for piercing. 

 This group has not been divided into orders. 



Family PODOPHRYID.a; 



Some of the tentacles knobbed, others pointed and prehensile. 



(85) Podophrya Ehrenberg. Our species is spherical and stalked, the slender 

 tentacles ending in minute knobs, like a pin. P. fixa (Miiller).* 



Family ACINETID.S 

 Tentacles numerous, usually knobbed and all alike. 



(86) Acineta Ehrenberg. Body inhabiting a lorica which is produced posteriorly 

 into a rigid stalk. Our species* has not been identified. 



Phylum PORIFERA (Sponges) 



Freshwater sponges occur in Boulder County, but the species has not been deter- 

 mined. 



