SCIENTIFIC SURVEY OF TURNER'S LAKE 15 
Oedogonium sp. A few sterile filaments collected from submersed 
twigs. 
Rhizoclonum eroglyphicum (Ag.) Kitz. 
Mougeotia sp. Sterile filaments only collected. 
Nostoc Linckia (Roth.) Bornet. Over many square yards of bot- 
tom at the north end of the lake, in water that reaches a depth of four 
or five feet, the gelatinous envelope of this alga forms a continuous 
blanket which excludes all other plants except a few stiff stemmed 
rushes. 
MOSSES 
(Identified by Mrs. N. L. Brirron, New York Botanical Garden) 
Bryum bimun Schreb. In rounded clumps at the water’s edge. 
Fontinalis antipyretica L. Water Moss. Grows beneath the sur- 
face on rocks and stones at Turner’s Lake. 
ANIMALS 
PORIFERA 
(Identified by Professor FRANK SmitH, University of Illinois) 
Fresh Water Sponge 
Heteromeyema rydert Potts. This sponge was found growing on 
logs at a depth of four or five feet below the surface. Statoblasts 
of two species of Bryozgoa were collected with the sponge materia! 
and these have been provisionally identified as belonging to C7rista- 
tella mucedo Cuvier and Pectinatella magmfica Leidy. 
HIRUDINEA 
(Identified by Dr. J. Percy Moore, University of Pennsylvania) 
Leeches 
Erpobdella punctata, (Leidy) This is a common and widely dis- 
tributed member of the family, very active and voracious. It will 
take human blood when given the opportunity. 
Holobdella stagnalis (Linn.) Very abundant in the shallow water 
along shore in Turner’s Lake but not usually observed unless the 
bottom rubbish is disturbed. 
MOLLUSCA 
(Identified by Dr. H. A. Pitspry, Academy of Natural Sciences, Philadelphia) 
The meagreness of the molluscan fauna of the lake is one of its 
striking features. Only four species were found and these repre- 
sented by less than a score of individuals although careful search was 
made in the rubbish raked from several square yards of bottom at 
