The Protozoa of Sandusky Bay and Vicinity. 437 
Class Mastigophora — Continued. 
Suborder Chlamydomonadina 
Family Chlamydomonadidae 
Genus Chlamydomonas Ehr. 
Chlamydomonas monadina Stein; occur- 
ing in the septic tanks of the experi- 
mental sewage disposal plant at Co- 
lumbus, Ohio, and in connection with 
the diatom Navicula, completely ob- 
structing the sand filters used there. 
The clogging seems to be due to 
both these forms, although either 
seems capable of doing it alone. The 
resting vegetative stage seems to form 
the mat causing the trouble. 
Chlamydomonas pulvisculus Ehr.; in 
pools left on beach by high surf at 
Cedar Point, abundant. 
Genus Chlorangium Stein. 
Chlorangium stentorinum Ehr.; attached 
to Entomostraca from  Biemiller’s 
cove. 
Suborder Volvocina. 
Family volvocidae. 
Genus Gonium O. F. Miller. 
Gonium pectorale Mill.; taken in tow net 
at boat landing near Big Nat’s cove, 
occasional. 
Genus Pandorina Bory de St. Vincent. 
Pandorina morum Ehrbg.; in Big Nat’s 
cove at point of boat landing in tow 
net, numerous. 
Genus Eudorina Ehr. 
Eudorina stagnata; in tow net in Big 
Nat’s cove at point of boat landing, 
common. 
Eudorina elegans Ehrbg.; in plankton of 
cove, common everywhere. 
