ON THE STRUCTURE OF CRYPTOGOXIMUS (NOV. 
GEN.) CHYLI (N. SR.), AN ABERRANT DISTOME, 
FROM FISHES OF MICHIGAN AND NEW YORK 
HENRY LESLIE OSBORX 
Professor of Biology and Geology, Hamline University 
SEVEN FIGURES 
DISTRIBUTION AND HABITS 
The material from which the present article has been prepared 
was derived in part from fishes taken in Lake Chautauqua, New 
York, and in part from others from St. Mary's River, Michigan, 
a river connecting Lakes Superior and Huron. The worm has 
been found chiefly in the stomach and intestine of the black bass, 
Micropterus dolomieu, where it is found disseminated through 
the creamy chyle. The minute worms are detected as black spots 
of elongate form. They are imbedded in the layer of chyle itself 
and not attached to the wall of the digestive organ of the host, 
which seems strange especially in view of the size of the suckers 
which are unusually well developed. The particular localities 
from which the worms were derived w^ere near the grounds of 
the Chautauqua Assembly at the head of the Lake, and in St. 
Mary's River in the narrow passage between the small island of 
Neebish and the upper end of St. Joseph's Island. A brief pre- 
liminary description of the worm appeared in the Zoologischer 
Anzeiger ('03). Since that time the worm has been reported 
by Stafford ('05) from the rock bass fAmbloplytes rupestris) 
in Canadian waters. The occurrence of the worm in these two 
localities is interesting, for while the Michigan and Canadian 
situations are a part of one river system the Chautauqua location 
is not connected with them and is a part of the Mississippi River 
THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 9, NO. 3. 
