PLATE XXV 
Figs. 1 A, B. Diestoceras indianense (Miller and Faber). A, ventral 
view. B, lateral view of same specimen. From Little Four Mile creek, 
near Oxford, Ohio; in the lower part of the Whitewater member of the 
Richmond. Collected by Prof. W. H. Shideler of Miami University. 
Fig. 2. Endoceras proteifoy'me Hall. Lateral view, with ventral side on 
left. See also Plate XXII, Fig. 3; Plate XXIII, Fig. 3. From Middleville, 
New York. Same specimen as Fig. le on PI. 49, of the Pal. New York, 
vol. 1, 1847. In the Trenton limestone. 
Fig. 3. Orthoceras breynii Martin. Ventral side. Figure copied from 
Petrefacta Derbiensis, 1809, pi. 39, fig. 4. Stated to be frequent in black 
marble at Ashford. A Carboniferous species. 
Fig. 4. Orthoceras annularis Fleming. Lateral view, inverted from 
original. Copied from Fleming, Ann. Phil., pi. 31, Fig. 8. Carboniferous. 
Fig. 5. Orthoceras annulare Phillips. Lateral view. Copied from Phil- 
lips, Geology of Yorkshire, 1836, pi. 21, fig. 9. Carboniferous. 
