38 Cincinnati Society of Natural History. 



DESCRIPTION OF PLATE I. 



Fig. 1 — Isochilina panolensis, Foerste. Left valve. Panola, Madi- 

 son county, Kentucky. Waco limestone member of Crab Orchard for- 

 mation. Magnified 4 diameters. 



Fig. 2 — Isochilina musculosa, sp. nov. Right valve. In chert at 

 top of the old George W. Defenbaugh quarry, southeast of Kokomo, 

 Indiana. Magnified 4 diameters. 



Fig. 3 — Kloedenia kokomocnsis, sp. nov. Left valve. A. anter- 

 ior view, showing strong convexity of valve, and the concave elevation 

 along the ventral border. B, left valve. In chert at the top of the old 

 George W. Defenbaugh quarry, southeast of Kokomo, Indiana. Mag- 

 nified 5 diameters. 



Fig. 4 — Beyrichia triplicata, Foerste. Right valve. Near top of 

 Alger clay division of the Crab Orchard formation, a mile west of 

 Valley, in Lewis county, Kentucky. Magnified 5 diameters. 



Fig. 5 — Pentameriis divcrgcns, sp. nov. A, C, lateral views of 

 pedicel valves. B, pedicel valve. D, interior of pedicel valve showing 

 spondylium and septum. E, interior of brachial valve showing septal 

 ridges united to the inner edges of the crural plates, and also a low 

 median septum. The anterior margin of the crural plates is broken 

 and the outline, therefore, is unknown. At the top of the old George 

 W. Defenbaugh quarry, southeast of Kokomo, Indiana. Magnified 1.5 

 diameters. 



Fig. 6 — Calymcnc clintoni, Vanuxem. Near the top of the Alger 

 clay division of the Crab Orchard formation, along the road from 

 Poplar Flats to Martins, in Lewis county, Kentucky. Distinct impres- 

 sion of glabella, anterior margin in front of glabella, and right fixed 

 cheek; the remainder added in outline. Magnified L5 diameters. 



Fig. 7 — Spirifcr nanus, sp. nov. Brachial valve, cast of interior. 

 At the spring on Big Salt Lick creek, one mile south of Glen Springs, 

 in Lewis county, Kentucky. West Union bed. Magnified 2 diameters. 



Fig. S — Spirifcr cxiguus, sp. nov. A, lateral view, outline. B, 

 pedicel valve. C. brachial valve, with top of pedicel valve. At the 

 top of the McReynold or Interurban traction quarry, in the southwest- 

 ern part of Kokomo, Indiana. Magnified 3 diameters. 



Fig. 9—lVhitficldclla crccta, sp. nov. A, pedicel valve. B, brach- 

 ial view. C, lateral view. At the top of the McReynold or Interurban 

 traction quarry, in the southwestern part of Kokomo, Indiana. 



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