OF DENISON UNIVERSITY. 
6i 
Euchlanis (dilitata) hipposideros, * * C. L. Herrick, Bull. 
Sci. Lab. Denison Univ., Vol. I, p. 47; pi. Ill, fig. 2. 
This is very abundant in those ponds that contain Lemnacea 
polyrrhiza^ L. 
Sp. 12. Euchlanis triquctra, Ehrenberg. 
Eucelanis triquetra, Hudson and Gosse. The Rotifera 
or Wheel-animalcules, Vol. II, p. 91 ; pi. XXIII, fig. 4. 
This species is not common. 
Family CATHYPNADAE. 
X. Genus Cathypna, Gosse. 
Sp- 13- Cathypna ohioensis, Herrick. 
Distyla ohioensis, C. L. Herrick, Bull. Sci. Lab. of 
Denison Univ., Vol. I, p. 54; pi. XII, fig. i. 
This species is not common. It has been encountered once or 
twice in our canal basins. 
Sp. 14- Cathypna leontina, sp. n 
[Plate I; Fig. 12.] 
Lorica smooth, sub-ellipsoidal, cephalad margin excavated. 
Dorsal valve larger than the ventral. Caudad margin of the dorsal 
valve furnished with a projecting plate. Eyes ellipsoidal. Toes two, 
rod-like. Near the distal extremity of each toe, there is a small lat- 
eral tooth. From this tooth the toe slopes obliquely to a terminal 
point. 
There is a deep lateral invagination and the animal has the habit 
of retaining its head within the lorica; these two traits render this spe- 
cies a Cathypna and not a Distyla. This species is separated from 
Cathypna ohioensis^ Herrick, its nearest ally, by the smooth lorica and 
the structure of the toe. 
This species is very rare. So far it has been encountered in but 
one small, weedy pool. Even there it is only occasionally seen. 
XL Genus Monostyla, Ehrenberg. 
Sp. 15. Monostyla lunaris, Ehrenberg. 
Monostyla lunaris, Hudson and Gosse, The Rotifera, 
or Wheel-animalcules, Vol. II, p. 98; pi. XXV, fig. 2. 
This species is not common. Occasionally, it is found in our 
weedy pools. 
