242 | College of Forestry 
is a parasite of the pike (Hsox) and perch (Perea), and an 
intermediate host in some species of minnow (p. 70). 
Atax ypstlophorus Bonz, in Anodonta grandis (p. 70). 
Atax, species not mentioned, in Anodonta grandis, Lamp- 
silts luteola, and L. ligamentina (p. 71). 
Conchophthirus. ‘This protozoan was universally present 
(ps4). 
Haldeman (1840) in a supplement of three pages describes 
three cercariz: 
Cercarina hyalocauda Hald., host, Physa heterostropha 
Say. : | 
Cercarina bilineata Hald., host, Galba catascoptum Say. 
Diplodiscus temporatus Stafford, host, Goniobasis  vir- 
guuica Say. 
Clinostomum marginatum Rudolphi. Fluke. 
This fluke is known to affect the Common Pereh (Perca 
flavescens). It is thought by Smallwood (1914, p. 22) that 
the larval stage may be passed in a mollusk, possibly 
Ammnicola limosa. 
Gordius aquaticus Linneus. Hair Worm. 
Karly larval stages of this round worm have been observed 
in the foot of snails, as well as in the mesenteries of a 
European frog (Rana temporaria), in aquatic insect larvee 
(Tanypus, Corethra, Chironomus), in the parenchyma of 
leeches, and in the mucus membrane of the intestine of 
fishes (cf. Cort, 1915, b,.p.,199). 
In a recent paper by Cort (1915, a) many larval trema- 
todes (flukes) are described from fresh water mollusks. 
These are listed below with the name of the host. 
