PLATE IV 
Fig. 1. Strophomena elongata. A, B, pedicel valves; C, D, H, L, interior views 
of pedicel valves; /, brachial valve; E, F, G, J, K, interior views of brachial valves. 
See also plate IX, Figs. 4 A, B, for other views of 1 /. Figs. 1 A, B, I, illustrate 
very .well the outline of the typical specimens as seen in series number 510, James 
collection. Walker Museum, Chicago University, although not selected from this 
series of types. Fig. 1 H, is one of the cotypes of the James collection. A, E, 
F, G, J, K, are from the Waynesville member, at Madison, Indiana. C, D, L, 
belong to the Nickles collection. C, Waynesville member at Oregonia. D, 
Waynesville member at Madison, Indiana. L, Liberty member, at Richmond, 
Indiana. 
Fig. 2. Strophomena planumhona-gerontica. A, pedicel valve; B, hinge-area; 
C, brachial valve. Madison, Indiana. Waynesville member. See also plate 
XI, Fig. 6. 
Fig. 3. Stropho7nena planumhona. A, pedicel valve; B, interior of pedicel valve. 
Madison, Indiana. Waynesville member. 
Fig. 4. Strophomena plamunbona-suhtenta. A, pedicel valve; B, C, brachial 
valves; D, interior of pedicel valve. Concord, Kentucky. Liberty member. 
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