OF DENISON UNIVERSITY. 
II9 
outline only ; c, a few of the radiating stride ; d, occasional appearance of the sur- 
face characters. 
Fig. 14. Pterinca brisa, Hall; a, b, views of different left valves referred to 
this species ; b, taken from a cast. 
' Fig. ic;. Orthis fausta, n. sp ; a, dorsal valve; b, ventral valve ; c. lateral 
view ;^^d, a few of the striae. 
P'ig. 16. Orthis fatisla, n. sp.; a, dorsal valve ; b, some of the striae of the 
form aciito-plicata . 
Fig. 17. Orthis elegant ula. var. parva. ii var.; a, ventral valve; b, lateral 
view of the same. .'W. 2:^ 
P'ig. 18. Biicania exigiia, n. sp.; a, view from above ; b, lateral view, the 
expansion of the aperture not well brought out ; c, lateral view of another speci- 
men ; d, another view of the same. 
Fig. 19. Bcllei'ophon Jiscello-striatiis. n. sp ; a, lateral view ; b, c, d, views of 
.the same ; e, a part of the carina, with a few of the nearest striae. 
P'ig. 20. Orthis Day tonensis., n. sp.; a, ventral view; b, interior view of the 
same. 
P'ig 21. Orthis Daytonensis, n. sp ; lateral view of a specimen presenting 
both valves. 
P'ig. 22. Platyostoma Niagarensc, Hall; a, lateral view ; b, view from above. 
P'ig. 23. Acidaspis; part of the head. 
P'ig. 24. Calymene; part of the head, partially restored. 
P'ig., 23. Calymene Blitmenbachii? Brongniart; head with a few of the 
thoracic articulations attached. 
Fig. 26. Lichas breviceps, Hall; a, glabella, not typical ; b, typical glabella 
of Ohio form ; c, surface of the latter, variously magnified ; d, pygidium ; e, gla- 
bella of a specimen from New Carlisle. 
Plate XIV. 
Fig. I. Ilhenus Madiso/iianus, Whitpeld ; a, view of a pygidium from above; 
b, lateral view of the sam.e. 
P'ig. 2. Ilhemis ; a, view of pygidium similar in some respects to that of 
/. Madisoniamis ; b, lateral view of the same. 
P'ig. 3. Arionellus ? ; view of the glabella and fixed cheeks. 
p'ig. 4. Plhoiiis Daytonensis, Hall and Whitfield ; a, view of a pygidium ; 
b, lateral view of the same. 
Fig. 5. Bathyw'tis ; view of a glabella, the curvature of the rim of the an- 
terior border not represented. 
Fig. 6. Ilhemis Daytonensis, H. and IF.; movable cheek, view obliquely 
from below. 
P'ig. 7. Illtcnns Daytonensis, H. and W.; a, lateral view of a head, the asso- 
ciated movable cheek figured ; b, view of the glabella from above ; c, view of the 
same from behind. 
P'ig. 8. Nucula minima, n. sp.: a, view of the anterior regions; b, lateral 
