6o 
BULLETIN OF THE LABORATORIES 
Monocerca rattus, * C. L. Herrick, Bull. Sci. Lab. of 
Denison Univ., Vol. I, p. 51. 
This species is not widely distributed but is abundant among the 
roots of the duckweeds polyrrJiiza^ L.) of a few of our 
ponds and canal basins. 
VI. Genus Rattulus, Ehrenberg. 
Sp. 7- Rattulus tigris, Mueller. 
Rattulus tigris, * Hudson and Gosse, The Rotifera, or 
Wheel-animalcules, Vol. H, p. 65; pi. XX, fig. 13. 
Diurella tigris, t - * C. L. Herrick, Bull. Sci. Lab. Denison 
Univ., Vol. I, p. 49. 
This species is very abundant in our weedy canal basins. 
Family DINOCHARIDAE. 
VII. Genus Scaridium, Ehrenberg. 
Sp. 8. Scaridium longicaudum, Ehrenberg. 
Scaridium longicaudum , Hudson and Gosse, The Rotifera 
or Wheel-animalcules, Vol. H, p. 65; pi. XXI, fig. 13. 
Although not widely distributed, this species is quite abundant 
among the roots of the duckweed [^Lemnacea polyrrhiza^ L.) in the 
few ponds and canal basins where it does occur. • 
Family SALPINADAE. 
VIII. Genus Salpina, Ehrenberg. 
Sp- 9- Salpina mucronata, Ehrenberg. 
Salpina mucronata, * * Hudson and Gosse, The Rotifera, or 
Wheel-animalcules, Vol. H, p. 83; pi. XXH, fig. i. 
This species is found in all of our weedy pools. 
Sp. 10. Salpina hrevispina, Ehrenberg. 
Salpina brevispina, * Hudson and Gosse, The Rotifera, or 
Wheel-animalcules, Vol. H, p. 65; pi. XXH, fig. 4. 
This is covered with impressed dots as described by Hudson and 
Gosse. This species is not so abundant as S. mucronata. 
Family EUCHLANIDAE. 
IX. Genus Euchlanis, Ehrenberg. 
Sp. II. Euchlanis dilitata, Ehrenberg. 
Euchlanis dilitata, Hudson and Gosse, The Rotifera or 
Wheel-animalcules, Vol. II, p. 90; pi. XXIII, fig. 5. 
