60 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 (Lemnacea polyrrhiza, L.) of a few of our 

 ponds and canal basins. 



VI. Genus Rattulus, Ehrenberg. 



S P- 7- Rattulus tigris, Mueller. 



Rattulus tigris, Hudson and Gosse, The Rotifera, or 



Wheel-animalcules, Vol. II, p. 65; pi. XX, fig. 13. 



Diurella tigris, * * 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 longicaudurri, Ehrenberg. 



Scaridium longicaudum, * * Hudson and Gosse, The Rotifera 



or Wheel-animalcules, Vol. II, p. 65; pi. XXI, fig. 13. 



Although not widely distributed, this species is quite abundant 

 among the roots of the duckweed {Lemnacea poly rrhiza, 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. II, p. 83; pi. XXII, fig. 1. 



This species is found in all of our weedy pools. 



Sp. 10. Salpina brevispina, Ehrenberg. 



Salpina brevispina, :;: " * Hudson and Gosse, The Rotifera, or 



Wheel-animalcules, Vol. II, p. 65; pi. XXII, fig. 4. 

 This is covered with impressed dots as described by Hudson and 

 Gosse. This species is not so abundant as S. mucronata. 



Family EUGHLANIDAE. 



IX. Genus Euchlanis, Ehrenberg. 

 Sp. n. Euchlanis dilitata, Ehrenberg. 



Euchlanis dilitata, * * * Hudson and Gosse, The Rotifera or 



Wheel-animalcules, Vol. II, p. 90; pi. XXIII, fig. 5. 



