438 The Protozoa of Sandusky Bay and Vicinity. 
Class Mastigophora — Concluded. 
Genus Volvox (Leeuw.) Ehr. 
Volvox globator Ehrbg.; in tow net at 
boat landing in Big Nat’s cove. 
Subclass Dinoflagellidia. 
Order Diniferida. 
Family Peridinidae. 
Genus Peridinium. 
Peridinium tabulatum (Ehr.) S. K.; tow- 
ing near shore at landing near Biemil- 
ler’s cove; also a blue form resem- 
bling the above in every respect 
(young?). 
Genus Ceratium Schrank. 
Ceratium hirudinella O. F. Muller; in 
plankton of Biemiller’s cove, com- 
mon. 
Class Infusoria. 
Subclass Ciliata. 
Order Holotrichida. 
Family Enchelinidae. 
Genus Holophrya Ehr. 
Holophrya ovum Ehr.; among duckweed 
roots from Biemiller’s cove, one spec- 
imen. 
Genus Trachelophyllum C. & L. 
Trachelophyllum vestitum Stokes; from 
towings taken in Biemiller’s cove. 
Trachelophyllum apiculatum (Perty) S. 
K.; in towings from Biemiller’s cove. 
Genus Prorodon Ehr. (Euchelyodon C. & L.) 
Prorodon farctus C. & L.; in floating de- 
caying vegetation. 
Genus Lacrymaria Ehr. 
Lacrymaria truncata Stokes; body not 
markedly striate except at anterior 
end. 
