72 UNIVERSITY OF COLORADO STUDIES 



Glaucoma Ehrenberg. G. scinlillans Ehr., Ice Lake and lower altitudes. 



Widely distributed. 

 Loxocephalus Ehrenberg. L. granulosus S. Kent, Corona and many lower lakes. 

 Frontonla Ehrenberg. F. leucas Ehr., Corona Lake. 



Distribution general. 



Family MICROTHORACLDAE 

 Cinetochilum Perty. C. margarilaceum Ehr., Jenny and Long lakes. 

 Microthorax Engelmann. M. sulcalus Eng., Eldora Lake. 

 Not common. 



Family PARAMAECILDAE 

 Paramaecium Miiller. P. caudatum Ehr., Corona, Ohmond Lake and lower altitudes; 

 P. bursaria Ehr. Common in Redrock Lake and other lower lakes, among algae. 

 Green in color; P. trichium Stokes, Jenny Lake. 



Family PLEURONEMLDAE 

 Lembadion Perty. L. bullinum Perty, Yankee Doodle and Redrock lakes. 



Common in these two lakes. 

 Cyclidium Ehrenberg. C. glaucoma Ehr., Jenny Lake. 



Family CYRTOLOPHOSLDAE 

 Cyrtolophosis Stokes. C. muckola Stokes, Jenny Lake and Redrock Lake. 



Order HETEROTRICHIDA 



Family PLAGIOTOMIDAE 



Spirostomum Ehrenberg. 5. teres C. and L., Jenny Lake and lower altitudes. 

 Blepharisma Perty. B. laleritia Ehr., Long Lake and Redrock Lake. Common. B. 



elongata Stokes, Reynolds' Lake. 

 Metopus Claparede and Lachmann. M. sigmoides Mull., Corona and lower altitudes; 



M. acuminata Stokes, Jenny Lake. Not common. 



Family STENTORJDAE 

 Stentor Oken. 5. caeruleus Ehr., Redrock Lake. 

 Not observed in the higher lakes. 



Family HALTERIIDAE 

 Halteria Dujardin. H. grandinella Mull., Corona and Jenny lakes. 

 Strombidium Claparede and Lachmann. 5. viride ( ?) Stein. 



A form corresponding to Stein's species was found in Stewart Lake. 



Family GYROCORLDAE 

 Gyrocoris Stein. G. oxyura Stein, Redrock Lake. 



