62 
BULLETIN OF THE LABORATORIES 
Sp, i6. Monostyla qwadridentata, Ebrenberg. 
[Plate I; Fig. lo.] 
Monostyla quadridentata, Hudson and Gosse, The Ro- 
tifera or Wheel animalcules, Vol. II, p. lOo; pi. XXV, fig. 3. 
Monostyla quadridentata, * C. L. Herrick, Bull. Sci. 
Lab. Denison Univ., Vol. I, p. 53; pi. IV, fig. 3. 
This species is abundant in all of our fresh water ponds. 
Sp. 1 7 - Monostyla truncata, sp. n. 
[Plate I; Fig. ii.] 
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 COLURID.A.E. 
XII. Genus Metopidia, Ehrenberg. 
Sp. 1 8 . Metopidea, hractea, Ehrenberg. 
Metopidia bractea, * * Hudson and Gosse, The Rotifera, 
or Wheel-animalcules, Vol. II, p. 109, 
Squamella bractea, C. L. Herrick, Bull. Sci. Lab. of 
Denison Univ., Vol I, p. 54; pi. IV, fig 2. 
This species is not abundant. 
Sp. 19. Metopidia elliptica, sp- 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. 
