NOTES ON JAPANESE PROTOZOA. 



535 



fundus is truncated posteriorly, sometimes it is strongly concave. 

 The extensions of the fundus are seldom uniform on the two sides 

 of the shell and are never the same in two individuals Usually the 

 narrow view of the shell presents an irregular outline. The com- 

 pression of the shell is seldom uniform, but is always stronger at 

 the fundus border. 



The size of the Japanese form ranges from 80 to lOOß in length, 

 including the prolongations of the fundus ; from 60 to 80// in breadth 

 of fundus and from 28 to 60/1 in the long diameter of the aperture. 



No living individuals were observed. 

 Heleopera Leidy. H. picta Leidy. 



Material from Mt. Rokkozan furnished the only species of the 

 genus observed. Under high power the plates are seen to be 

 circular, slightly overlapping. Little foreign material is attached to 

 the shell. 



Phryganella Penard. P. hemisphaerica Penard. 



Frequently observed in many localities. 

 Campascus Leidy. C. dentatus, sp. nov. (figs. 15-18). 



In 1877 Leidy discovered Campascus comutus in China Lake, 

 Wyoming, at an altitude of 10,000 feet. Apparently the species 

 has not been observed since that time. 



More recently Penard described two species of the genus, Cam- 

 pascus triqueter and Campascus minutus, from the deep lakes of 

 Switzerland. In both species described by Penard the fundus is 

 without the horn-like prolongations of the form observed by Leidy. 

 Campascus mimitus was reported by Wailes in 19 12 from the New 

 York water-supply drawn from Croton Lake Reservoir. 



The form under consideration, which is apparently a new species, 

 was found in the ooze taken from the rocks along the shore of Lake 

 Hakone, Japan, in August, 1912. 



The description follows : Shell of yellowish, chitinoid material 

 similar in general outline to Campascus comutus. Under high power 



