PLATE IX 
Fig. 1. Strophomena neglecta. A, view along hinge area; B, brachial valve, 
with outlines restored; C, lateral view, with indication also of the curvature of the 
pedicel valve. Type specimen, number 2393, in the James collection, belonging 
to Walker Museum of Chicago University. See also plate V, Figs. 1 A, B. One 
mile west of Blanchester, Ohio. Blanchester division of the Waynesville. 
Fig. 2. Strophomena siibtenta. Curvature of brachial valve, viewed from the 
side. See also plate VIII, Figs. 2 A, B. Type specimen, number 922-2, in the 
American Museum of Natural History, in New York City; Oxford, Ohio. Waynes- 
ville member of the Richmond. 
Fig. 3. Strophomena planumbona. A, view along the hinge area; B, lateral 
view, with indication also of the curvature of the pedicel valve. See also plate 
VIII, Figs. 1 A, B, C, D, E. Type specimen, number 918-3, in the American Mu- 
seum of Natural History, in New York City, labelled as coming from Cincinnati, 
Ohio, but probably from Oxford, Ohio, in the Waynesville member. 
Fig. 4. Strophomena elongata. A, view along the hinge area; B, lateral view, 
with indication also of the curvature of the pedicel valve. Type specimen, num- 
ber 510, in the James collection, belonging to Walker Museum of Chicago Univer- 
sity. See also plate IV, Fig. 1 /. Waynesville member. Possibly from Clarks- 
ville, Ohio. 
Fig. 5. Strophomena wisconsinensis . A, view along hinge area; B, C, lateral 
views, with indications also of curvature of pedicel valves. B is a lateral view of 
A. See also plate VII, Figs. 1 A, B. Schuchert collection. Wilmington, Illinois. 
Richmond group. 
Fig. 6. Strophomena planodorsata. A, lateral view, with indication also of curva- 
ture of pedicel valve; B, brachial valve. Type specimen. University of Alinnesota 
collection. Richmond beds. Spring Valley, Minnesota. Copied from Minnesota 
Paleontology, vol. Ill, part 1, 1893. Plate XXXI, Figs. 8, 9. 
Fig. 7. Strophomena planodorsata. Lateral view, showing curvature of pedicel 
valve. Type specimen, Schuchert collection. See also Plate Vll, Fig. 6; and 
Minnesota Geology, vol. Ill, part 1, 1893, plate XXXI, Fig. 10. Wilmington, Illinois. 
Richmond group. 
Fig. 8. Strophomena planodorsata. A, view along the hinge-area; R, lateral view, 
with indication of the curvature of the pedicel valve. Specimen much bent by 
crushing. Schuchert collection. Wilmington, Illinois. Richmond group. See 
also plate VII, Fig. 7 B. 
Fig. 9. Strophomena planodorsata. Curvature of pedicel valve, seen from the 
side. Schuchert collection. Wilmington, Illinois. Richmond group. See also 
plate VII, Fig. 7 A. 
Fig. 10. Strophomena neglecta. Curvature of interior of pedicel valve, seen from 
the side. Cited, but not figured by Schuchert in Minnesota Geological Survey, 
vol. Ill, 1893, p. 388. Savannah, Illinois. Schuchert collection. Richmond 
group. See also plate Vll, Fig. 5. 
Fig. 11. Strophomena planodorsata. Curvature of pedicel valve, seen from the 
side. Specimen, number 8191, University of Minnesota collection. Iron Ridge, 
Wisconsin. Richmond group. See also plate Vll, Fig. 8. 
Fig. 12. Strophomena planodorsata. Curvature of valves, antero-posteriorly. 
Nickles collection. Sterling, Illinois. Richmond group. 
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