Jan., 1912.] 
The Arnheim Formation. 
453 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
PLATE XXII. 
Dalmanella jugosa. A, B, pedicel valves; C, D, brachial valves. 
E, F, G, interiors of brachial valves; H, interior of pedicel valve. 
Arnheim bed, south of Arnheim, Ohio. 
Heterospongia subramosa-knotti. Lateral view showing osculum 
surrounded by radiating channels. Arnheim bed, northwest of 
home of Col. J. B. Wathen, about a mile west of Lebanon, Ky. 
Platystrophia cypha-conradi. A, pedicel valve; B, C, anterior 
views. Arnheim bed, half a mile south of Smithville, in Bullitt 
County, Kentucky. These figures, in the order named, represent 
other views of the specimens illustrated by figures 14 A, 7 B, and 
7 A, on Plate IV, in Volume XVI, of the Bulletin, Scientific 
Laboratories, Denison University, 1910. 
Platystrophia with outline of PI. clarksvillensis, but the prominent 
median fold on the brachial valve has the two median plica- 
tions much more conspicuously elevated than the lateral ones on 
the fold, as in PI. cypha, to which it is closely related. Arnheim 
bed, south of Arnheim, Ohio. 
Platystrophia cypha. Anterior view of specimen represented by 
Figure 5, on Plate III, Bulletin, Denison University, 1910. Arn- 
heim bed, three miles south of Maysville, Kentucky, in deep 
railroad cut. 
Platystrophia wallowayi. A, brachial valve; B, C, posterior views; 
D, anterior view; E, lateral view with the beaks directed down- 
ward. Arnheim bed, on Walloway Creek, two miles south of 
Rileys, in Marion County, Kentucky. Horizon, 15 feet above the 
lowest strata containing Leptaena richmondensis. A globose form 
with rather strong growth striae in the majority of specimens. 
Leptaena richmondensis-precursor. Brachial valve. Arnheim bed, 
one mile south of Pisgah, in the southeastern comer of Butler 
County, Ohio. 
Dinorthis carleyi. A, brachial valve; B, C, pedicel valves; D, 
interior of pedicel valve. Arnheim bed, Oregonia, Ohio. In 
Dinorthis retrorsa, of Wales, the median part of the brachial 
valve is figured as more angular in its elevation, with somewhat 
flattened lateral slopes. 
Rhynchotrema dentata-amheimensis. A, pedicel valve, from 
Arnheim, Ohio, from same specimen as Fig. 12, Plate IV, Volume 
XIV, Bulletin, Denison Univ., 1909. B, lateral view, of specimen 
from Mount Washington, Bullitt County, Kentucky. Arnheim 
bed. 
Strophemona concordensis. A, interior of brachial valve, three 
miles south of Maysville, Kentucky; B, interior of pedicel valve, 
more abruptly thickened along the anterior and lateral margin 
than in the great majority of specimens. Arnheim, bed, on Eddies 
Run, in Adams County, one mile east of Clermont County, along 
the pike from West Union to Decatur, Ohio. 
Platystrophia ponderosa. Pedicel valve, rather strongly water 
worn, with holes bored by some other animal. Arnheim bed, 
south of Arnheim, Ohio. 
