PLATE VI 
Fig. 1. Strophomena approximata. A, brachial valve; B, pedicel valve; type 
specimen, number 2394, James collection, in Walker Museum, at Chicago Uni- 
versity. C, brachial valve; D, pedicel valve, specimen in same series, but not a 
type. Definite horizon not known, but either Liberty or Whitewater. Dearborn 
county, Indiana. 
Fig. 2. Strophomena vetusta. A, C, brachial valves; B, D, H, G, pedicel valves; 
E, interior of brachial valve; F, interior of pedicel valve. B, C, D, E, types, num- 
ber 1567, James collection, in Walker Museum at Chicago University; labelled as 
coming from Blanchester, Ohio. Either from Liberty or Whitewater members. 
A, Clinton county, Ohio; F, Dayton, Ohio; both from Whitewater member. G, 
H, Cane Springs, Kentucky, from southern extension of Liberty member. 
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