Description of Plate 1. 



Nexo or imperfectly knoivn Fossils from the Ohio Waverly. 



Figures 1-4 — Four views of a nearly perfect specimen of Conocardlum for comparison 

 with C. alter nistr latum., Herrick. From concretionary shales of the Cuyahoga 

 division at Wooster. Greatly enlarged. 



Figure 5 — A minute specimen of Nucida sp. From the Cuyahoga shales, drawn with 

 the camera lucida and much enlarged. 



Figure G — Lepiodesnio. nasuta, Herrick, from Burbank, Ohio, to illustrate the simi- 

 larity of the right valve with that of L. hector, Hall. 



Figure 7 — Lriopteria euyahoga, sp. n. From the concretionary shales of the Cuya- 

 hoga valley, 50 feet below the Millstone grit. 



Figures 8-10 — Three different specimens of Cytherella iiniomforinis, sp. n., highly 

 magnified. From the upper layers (Keokuk) of Scioto county, Ohio. 



Figure 11 — Unidentified Ostracode from same place. 



Figure 12 — Fragment of the interior of pygidium of Proetits prcecursor, Herrick, from 

 Cuyahoga Falls. Complete heads of the same species have been found at this 

 locality since the drawing was prepared, making its presence certain. 



Figure 13 — Pygidium of Pha'ethonides spinosus, Herrick, from horizon of the shaly 

 beds at Moot's run (Cuyahoga shale), in Scioto county, Ohio. 



Figure 14 — Pygidium of Phillipsia vteramecensis, Shumard. From upper layers 

 (Keokuk) of Scioto county, Ohio. 



Figure 15 — A close homologue of Cypricardinia scitula, from the -Keokuk of Scioto 

 county, Ohio, to illustrate the persistence of the type. 



Figure 10 — Choneies illinoisensis, from the Keokuk of Scioto county, Ohio. 



Figure 17 — Discina viagnifica, sp. n. From Hemlock Falls, Ashland county, Ohio, 

 a few feet above conglomerate II. Two-thirds natural size. 



Figure 18 — Spirifer pseudolineatus, Hall. Locality and position the same as fig. 15. 



Figure 19 — Spiriferina spinosa, Hall. Locality and position same as the last. 



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