The Protozoa of Sandusky Bay and Vicinity. 445 
Class Infusoria — Continued. 
Order Peritrichida 
Family Vorticellidae 
Subfamily Urceolarinae 
Genus Trichodina Stein 
Trichodina pediculus Ehr.; parasitic on 
Hydra fusca. 
Subfamily Vorticellidinae 
Genus Scyphidia Lachmann 
Scyphidia fromentellii S. K.; on Carche- 
sium polypinum from Water Works 
cove. 
Scyphidia inclinans D’Udek.; on Nais 
from basket factory cove. 
Scyphidia physarum C. & L.; attached to 
Physa in material from basket fac- 
tory cove. 
Scyphidia limacina Lach.; in respiratory 
cavity of Planorbis. The form ob- 
served answered the above description 
except that the body was packed full 
of chloroplasts and striations were 
visible only under most favorable con- 
ditions. Found in great abundance. 
Scyphidia constricta Stokes; on foot and 
tentacles of Planorbis, numerous. 
May this form not be the same as S. 
limacina and differences being due to 
chloroplasts. 
Genus Spirochona Stein 
Spirochona gemmipara Stein; on Gam- 
marus from Castalia, common on all 
appendages. 
Genus Gerda C. & L. 
Gerda fixa D’Udk. ; attached to debris from 
Biemiller’s cove. 
