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272 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
GENUS SCAPHOLEBERIS Schoedler. 
Scapholeberis mucronata Miller. 
Scapholeberis mucronata—C. L. Herrick, Final Report Minn. Crust., p. 42; Pl. J, Fig. 5. 
Habitat: Atlanta. Georgia; Cincinnati, Ohio; Lockland, Ohio. 
Abundant in shallow grassy ponds and sluggish creeks. 
GENUS SIMOCEPHALUS Schoedler. 
Simocephalus vetulus Miller. 
Simocephalus vetulus—C. L.. Herrick, Final Report Minn. Crust., p. 46. . 
Habitat: Cincinnati, Ohio; Kent county, Delaware. 
Simocephalus serrulatus Koch. 
Simocephalus americanus—E. A. Birge. Notes on Clad., pp. 6-8; Pl. I, Fig. 6. 
Length 1.7 mm. to 1.9 mm.; height 1.43 mm. This species is 
often covered with vorticellide. Habitat: Atlanta, Georgia; Baxley, 
Georgia; Cincinnati, Ohio; Kent county, Delaware. 
GENUS DAPHNIA Schoedler. 
* Daphnia pulex Miller. 
Dapnnia pulec—C. L. Herrick, Final Report Minn. Crust., p. 56. 
Habitat: Cincinnati, Ohio; Covington, Kentucky. ‘This species is 
fond of foul water and is often associated with Moina paradoxa. 
Daphnia longiremus Sars. (?) 
Daphnia longiremus Sars—C. L. Herrick, Final Report Minn. Crust., p. 63. 
Length 1.70 mm. This is a non-crested, hyaline specimen, marked 
with rectangular meshes and devoid of pigment fleck. It resembles 
the species under which I have placed it in all respects excepting 
siez. I do not consider this alone sufficient to establish a new species. 
It may, however, be a variety of the above. 
FAMILY BOSMINID©. 
GENUS BOSMINA Baird. 
Bosmina cornuta Jurine. 
Bosmina cornuta—E. A. Birge, Notes on Clad., p. 15; Pl. I, Fig. 10. 
Length 0.26 mm. Habitat: Tusculum, Ohio. Rare. Found} in 
grassy pools. 
