Certain Protozea and Other Invertebrates. 241 
perch and walleyed pike, and practically every dogfish (Amia calva) 
examined was heavily loaded with them. Many duck stomachs exam- 
ined, especially those of the ruddy duck, contained from a few to many 
tapeworms. 
Angleworms or Fishworms are not abundant in this region. The 
country about the lake is chiefly sandy, a soil not favorable to angle- 
worms. At the edges of ditches, marshes and woodland ponds, where 
the soil is a black loam with some admixture of clay and decaying vege- 
tation, a rather small species of Lumbricus is fairly abundant. Fisher- 
men who know these places are usually able to secure all they need for 
bait. The farmers and farmers’ boys and the boys of the village are 
the ones who make most use of fishworms in their angling. 
On December 7 (1904), worms which resembled angleworms were 
observed in considerable numbers coiled up under a submerged water- 
soaked board at Long Point, where they evidently were passing the 
winter in that condition. These worms, however, possessed no annular 
ring. In alcohol they display a fine opalescent iridescence in reflected 
light. One seemed to be dividing by a constriction near the middle. 
Some very small worms, resembling fishworms in general appearance 
when alive, were seen at the mouth of a ditch April 19 (1901). 
Cotylaspis insignis Leidy is a common parasite of the mussels of 
Lake Maxinkuckee and Lost Lake. To the naked eye this parasite looks 
hke a minute yellowish leech. Its position in the mussel is close up in 
the axils of the gills. It was found in Lampsilis luteola and also in 
Anodonta grandis footiana, trom one to several being found in nearly 
every example of these species examined August 23 (1906). It was 
also found in mussels taken on September 28 following, in Little River 
near Fort Wayne. 
The so-called Horsehair Snake or worm (Gordius sp.) is very abun- 
dant in and about Lake Maxinkuckee. According to anglers, many of 
the grasshoppers used by them for bait are infested with this parasite. 
On August 2 (1906) large numbers were seen writhing about in mud 
among snails along the Outlet where it had been suddenly lowered by 
a dam at the railroad bridge. We suspect that they may be parasitic 
in this snail also. They were frequently found in fishes, either free in 
the lower intestine or encysted and coiled up in some of the internal 
organs. The bluegill appears to be especially liable to infection by 
Gordius. It may be that the fish become infected through the grass- 
hoppers they devour. On August 6 (1906) these worms were noted in 
considerable numbers in shallow water on the east side of the lake. 
A long, slender, brownish worm, probably a species of Tubifex, was 
found in considerable numbers projecting up into the shallow water from 
the soft mud bottom of Lost Lake. These were first observed June 8 
16-—16568 
