62 BULLETIN OF THE LABORATORIES 



Sp. 16. Monostyla quadridentata, Ebrenberg. 



[Plate I; Fig. 10.] 



Monostyla quadridentata, Hudson and Gosse, The Ro- 



tifera or Wheel animalcules, Vol. II, p. ioo; pi. XXV, fig. 3. 

 Monostyla quadridentata, * C. L. Herrick, Hull. Sci. 



Lab. Denison Univ., Vol. I. p. 53; pi. IV, fig. 3. 



This species is abundant in all of our fresh water ponds. 



Sp. 17- Monostyla tfuncata, S P- n - 

 [Plate I; Fig. 11.] 



Lorica subovate, cephalad margin truncate, straight, caudad mar- 

 gin convex. Eye single, median, near the mastax. Mastax large, 

 trophi sub-malleate. Foot moderate, non-contractile, terminating in 

 a single toe. 



In the specimen examined, the cephalad extremity of the body 

 appeared to be bifurcate ; this may have been an illusion due to the 

 point of view. 



This species is very rare. I have seen only one specimen. The 

 truncated cephalad margin of the lorica serves to distinguish this spe- 

 cies from all others. 



Family COLURIDAE. 



XII. Genus Metopidia, Ehrenberg. 



Sp. 18. Metopidea, bractea, Ehrenberg. 



Metopidia bractea, * Hudson and Gosse, The Rotifera, 



or Wheel-animalcules, Vol. II, p. 109, 

 Squamella bractea, C. L. Herrick, Bull Sci. Lai), of 



Denison Univ., Vol I, p. 54; pi. IV, fig 2. 



This species is not abundant. 



Sp 19. Metopidia elliptica, S P- n. 

 [Plate I; Fig. 8.] 



Lorica smooth, sub-elliptical, about twice as long as broad. 

 Caudad margin of ventral valve excavated. From the cephalad ex- 

 tremity of the body, two small, but conspicuous, lateral ears project. 

 Joints of the foot sub-equal. The two terminal toes pointed, and as 

 long as the remainder of the foot. 



This species is not common. It is occasionally encountered in 

 pools covered with monocellular algae. 



