92 
AUG. F. FOERSTE 
Orthis fissiplicata Foerste 
Orthis calligramma fissiplicata Foerste, Geol. Surv. Ohio, 
7, 1895, p. 573, pi. 37a, figs. 20, a, b. 
This species is cited by Savage from the oolite member of the 
Edgewood limestone in eastern Missouri and western Illinois. 
Platymerella manniensis Foerste 
Platymerella manniensis Foerste, Bull. Sci. Lab. Denison 
Univ., 14, 1909, p. 70, pi. 1, fig. lA-D. 
Pentamerella? manniensis Savage, Bull. 23, Geol. Surv. Illi- 
nois, Stratigraphy and Paleontology of the Alexandrian Series 
in Illinois and Missouri, pp. 28-36 of reprint. 
Platymerella manniensis Foerste, Bull. Denison Univ., 19, 
1920, p. 223, pi. 23, figs. 5 A-H. 
This species has been found at the base of the Brassfield lime- 
stone in the quarry immediately north of Lawshe, in Adams 
county, Ohio. In the Alexandrian strata of Missouri and 
Illinois it occurs immediately beneath those strata which contain 
a typical Brassfield fauna. The Brassfield horizon, according 
to Savage, cited above, is 34 feet thick, and the underlying 
Platymerella manniensis horizon is 1|^ feet thick. Spirifer radia- 
tus is found in strata overlying the typical Brassfield. 
In Missouri and Illinois, the Platymerella manniensis horizon 
is underlain, in descending order, by the Essex, Edgewood, and 
Girardeau limestones. The argillaceous strata immediately 
beneath the Brassfield limestone in the quarry half a mile north- 
east of Centerville, Ohio, appear to belong to equivalents of 
either the Essex or Edgewood limestone. 
Whitfieldella cf. cataractensis Williams 
Meristella umbonata Foerste, Bull. Sci. Lab. Denison Univ., 
1, 1885, p. 88, pi. 13, fig. 2 a, b; Geol. Surv. Ohio, 7, 1895, p. 
590, pi. 25, fig. 2 a, b. 
The Brassfield specimens described and figured under the 
name Meristella umbonata undoubtedly resemble the type of 
Athyris umbonata Billings externall}^ Internally they present 
