68 UNIVERSITY OF COLORADO STUDIES 



The last five species and the variety were identified by Wailes. Of the above 

 species D. lebes is the largest, D. pyriformis is the most common and D. constricta is 

 found at higher altitudes. The latter was observed at 13,000 feet. D. rubescens, 

 one of the smaller species, is common on James Peak at 12,500 feet. Other 

 species range from Summit Lake to lower levels. The finest specimens of the 

 larger forms were taken from the ooze at the bottom of Lake Eldora where they are 

 very abundant. 



Heleopera Leidy. H. rosea Penard, Summit Lake and James Peak, common; H. per- 

 licola Leidy, Summit Lake; H. perlicola, var. amelhysla Penard, Summit Lake; the 

 latter species and variety identified by Wailes; former species very common on 

 James Peak at 12,500 feet among mosses — also found in Pumphouse Lake. 



Lecquereusia Schlumberger. L. spiralis Ehr.; L. epistomium Penard; L. modesta 

 Rhumbler. 



The first two of these three known species of the genus are not uncommon at 

 an altitude of 11,000 feet. Both were observed as high as Summit Lake; the other 

 species at Corona and lower levels. In material from Summit Lake Dr. Penard 

 found a form shaped like L. modesta but with a test of typical vermiform pellets. 

 He considers it a variety of L. spiralis. 



Nebela Leidy. N. denlistoma Penard; N. collaris Ehr.; N. lageniformis Penard; N. 

 longicollis Penard; N. flabellum Leidy; N. tubulosa Penard; N. bigibbosa Penard; 

 N. minor Penard; N. galeala Penard; N. tincla (Leidy) Awer.; N. vitraea Penard; 

 N. collaris, var. relorta Leidy; N. denlistoma, var. lacustris Wailes. 



The last three species and the varieties were identified by Wailes. Dr. Penard 

 identified N. longicollis and N. bigibbosa from the writer's slides. The genus is widely 

 distributed, most of the species being found at very high altitudes, in Summit Lake, 

 on James Peak and at Corona. 



Phryganella Penard. P. nidulus Penard, Lake Eldora; P. hemispherica Penard, James 

 Peak. 



The latter identified by Wailes. The former species is common in the ooze at 

 the bottom of Lake Eldora. 



Plagiopyxis Penard. P. callida Penard, Lake Corona. 

 Identified by Wailes. 



Pontigulasia Rhumbler. P. spectabilis Penard, Ice Lake; P. compressa Carter, Summit 

 Lake. 



The latter species identified by Wailes. Many specimens of the former species 

 were found in the ooze at the bottom of Lake Eldora. 



Pyxidicula Ehrenberg. P. cymbalum Penard, Summit Lake. 

 Identified by Dr. Penard. A rare form. 



Family EUGLYPHIDAE 



Assulina Ehrenberg. A. minor Penard; A. muscorum Greeff, Summit Lake. Identified 

 by Wailes; A. seminulum Leidy, Corona. Identified by Wailes. 



A. minor was observed in Summit Lake and above the lake at an altitude of 

 13,000 feet. 



