PROTOZOA OF HIGH MOUNTAIN LAKES IN COLORADO 73 



Order HYPOPTRICHIDA 

 Family OXYTRICHIDAE 



Oxytricha Ehrenberg. 0. pellionella Mull., Ice Lake. 



Very widely distributed. 

 Stichotricha Perty. 5. secunda Perty, Jenny Lake. 



Uroleptus Ehrenberg. U. longicaudatus Stokes, Reynolds' Lake; U. dispar ( ?) Stokes. 

 A common form in Jenny and Yankee Doodle lakes corresponds closely to this 

 species. 



Stylonychia Ehrenberg. 5. mytilus Ehr., Brainard Lake; S. notophora ( ?) Stokes, Corona 

 and lower altitudes. 



Very widely distributed. There is some doubt as to its identification but it 

 closely resembles Stokes's species. 



Histrio Sterki. 



Further study of the species of this genus will be necessary to identify them. 

 Members of the genus were taken from Ohmond Lake, and from lower altitudes. 



Family EUPLOTLDAE 

 Euplotes Ehrenberg. E. charon Mull., Corona; E. patella Ehr., Ohmond Lake. 

 Aspidisca Ehrenberg. A. costata Duj., Ice Lake. 

 Very widely distributed. 



Order PERITRICHIDA 



Family VORTICELLLDAE 



Vorticella Linnaeus. V. campanula Ehr., Jenny Lake; V. alba From., Corona; V. mac- 

 rophyla Stokes, Yankee Doodle Lake; V. octavo (?) Stokes, Corona; V. sphaerica 

 (?) D'Udek., Corona. 



Epistylis Ehrenberg. E. flavicans Ehr. 



This species was taken from Park Lake, Tolland, at slightly less than 9,000 feet 

 altitude. Not observed in any of the higher lakes. 



Vaginicola Lamarck. V. sp. — An unidentified form very common in Summit Lake is 

 referred to this genus. The lorica is compressed and slightly concave at the margin 

 in the middle of the compressed surfaces. The posterior extremity is broadly rounded , 

 sessile. Dense and of yellowish hue. Characteristics of the polyp not known, as 

 the forms were not observed until the material had been preserved and the soft parts 

 destroyed. 



Cothurnia Ehrenberg. C. sp. — Lorica transparent, cylindrical with margin slightly 

 everted. Three or four annulations about the middle of the lorica. Stalk very 

 short. Common in Summit Lake. Living polyp not observed. Probably a new 

 species. 



