PLATE VIII 
Fig. 1. Strophornena planumhona. A, B, pedicel valve, one view enlarged. 
C, D, brachial valves, one view enlarged. E, interior of pedicel valve. See also 
plate IX, Figs. 3 A, B. Type specimens, number 918-3, in the American Museum 
of Natural History, in New York City. Probably from Waynesville member, at 
Oxford, Ohio. Originals of Figs. 4 a, h, c, on plate 31 B, Paleontology of New York, 
vol. 1. 
Fig. 2. Strophoniena subtenta. A, B, brachial valves, one of the views enlarged. 
Type specimen, number 922-2, in the American Museum of Natural History, in 
New York City. Waynesville member of the Richmond; Oxford, Ohio. See 
also plate IX, Fig. 2. 
Fig. 3. Dahnanella einacerata. A, B, brachial valve, one of the views enlarged. 
Type specimen, number 1339-2, in the American Museum of Natural History, in 
New York City. Original of Fig. 1; plate II, Fifteenth Report of the New York State 
Museum. Probably from Southgate member of Eden, at Cincinnati, Ohio. 
Fig. 4. Plectorthis fissicosta. Pedicel valve, somewhat crushed. Type speci- 
men, number 4490, in the American Museum of Natural History, in New York 
City. See also this Bulletin, vol. XIV, plate IV, Figs. 5 A, B, for views of the 
brachial valve. Fairmount member, at Cincinnati, Ohio. 
Fig. 5. Trematospira granulifera. Brachial valve. Tyi)e specimen, number 
1622, in Dyer collection, Harvard University. There is no hinge-area, the line in 
the figure having been added to suggest the amount of curvature of the beak of the 
pedicel valve. Said to have been found at Cincinnati, Ohio, but the origin is 
entirely unknown. Probably a Silurian or Devonian shell. 
Fig. 6. Hehertella suhjugata. Brachial valve. Type specimen, number 1342- 
1. Original of Fig. 1 n, on plate 32 C, New York Paleontology, vol. 1. Cincinnati, 
Ohio. Probably near Bellevue horizon. 
Fig. 7. Acidaspis, species? Cephalon, rather imperfect. Number 9581, in the 
Faber collection, belonging to the Walker Aluseum, Chicago University. Lowry, 
Ohio. Horizon unknown. See also plate X, Fig. 6. 
Fig. 8. Austinella scovillei. A, pedicel valve; number 105, James collection. 
B,C, interiors of pedicel valves ; numbers 107, 106, James collection. Walker Museum, 
Chicago University. A, from Blanchester, Ohio. R, C, from Oregonia, Ohio, the 
type locality. Blanchester division of the Waynesville. 
Fig. 9. Austinella whitfieldi. Interior of pedicel valve. Number 8114, in Gur- 
ley collection, in Walker Museum, Chicago University. Spring Valley, Minnesota. 
Richmond group. 
Fig. 10. Rafinesquina declivis. Pedicel valve, enlarged almost twice the original 
diameter. See also this Bulletin, vol. XVI, plate V, Fig. 12 C. Boyd’s Station, 
Kentucky. Type specimen, from series number 2392, in the James collection, in 
Walker Museum of Chicago University. 
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