PROTOZOA OF HIGH MOUNTAIN LAKES IN COLORADO 67 



summer months. No temperature records of this lake were taken. 

 The higher lakes are practically void of plant life, except the micro- 

 scopic forms. At the outlets, however, algae and mosses are usually 

 to be found abundantly. Here protozoa have their habitat and many 

 species are obtained by collecting these plants. The ooze from stones 

 and the beds of the lakes furnish other forms, especially rhizopods. 



By comparing the following list with the protozoa reported from 

 sea-level in tropical Tahiti {Science, September 9, 1910), there will be 

 seen not only the latitudinal but also the great altitudinal range which 

 many of our species have. 



There follows a classified list of protozoa with the highest altitude 

 observed for each genus or species identified: 



Phylum PROTOZOA, Subphylum Sarcodina 



Class RHIZOPODA, Subclass AMOEBEA 



Order GYMNAMOEBIDA 



Family AMOEBLDAE 

 Amoeba Ehrenberg. A. proteus Ehr., Ohmond Lake; A. verrucosa Ehr., Ice Lake; A. 

 radiosa Ehr., James Peak Lake. 



Order TEST ACE A 



Family ARCELLLDAE 

 Arcella Ehrenberg. A. vulgaris Ehr., James Peak Lake; A. discoides Ehr., Summit Lake; 

 A. arenaria Greeff, Summit Lake; A. catinus Penard, Summit Lake; A. beams pherica 

 Perty, Summit Lake. 



The first two species are widely distributed and are common at high altitudes. 

 The last three species were identified by Wailes. 

 C entropy xis Stein. C. aculeata Stein; C. laevigata Penard. 



The former species is very widely distributed, observed from Summit Lake to 

 lower altitudes. The latter species identified by Wailes from Corona. 

 Cochliopodium Hertwig & Lesser. C. bilimbosum Auerbach. On James Peak. Very 



rarely observed. 

 Cucurbitella Penard. C. mespiliformis Penard. 



A single specimen, but a very representative one, was found in Lake Eldora. 

 Difflugia Leclerc. D. pyriformis Perty; D. conslricla Ehr.; D. rubescens Penard; D. 

 lobosloma Leidy; D. corona Wallick; D. lanceolata Penard; D. curvicaulis Penard; 

 D. elegans Penard; D. acuminata Ehr.; D. bacillifera Penard; D. lebes Penard; 

 D. fallax Penard; D. globulus Ehr.; D. oblonga Ehr.; D. oblongata, var. lacuslris 

 Penard; D. lucida Penard; D. pristis Penard; D. manicata Penard. 



