126 The Ottawa Naturalist. [January 



Whitewater members of the typical Richmond, and Strophomena 

 neglecta, Strophomena sulcata, and Strophomena vetusta, which range 

 from the upper third of the Waynesville member into the Liberty and 

 Whitewater members. In Ohio, Dalmanella jugosa is most abundant 

 in the Waynesville member. Platystrophia clarksvillensis occurs both 

 in the Waynesville and Liberty members. These fossils may represent 

 a late stage of the Waynsville fauna or an early stage of the post- 

 Waynesville portion of the typical Richmond. 



The underlying Pholadomorpha pholadiformis horizon is re- 

 garded as a part of the Richmond section. 



The shale section along the shore of the bay, a mile and a half 

 north of the J. B. Stratton store, lithologically resembles the Sheguin- 

 dah clay shales of Manitoulin island, but not a single fossil has been 

 found which would warrant such a correlation. The nearest relative 

 of Bollia permarginata appears to be Bollia regularis, from the basal 

 or Arnheim member of the Richmond. Considering the inadequacy of 

 the small fauna collected it is notj worth while to discuss the possibility 

 of this Michigan shale corresponding to the Maquoketa shale of more 

 western states. It may not belong to the Richmond at all. For the 

 , present, at least, its correlation must remain in doubt. 



PLATE IV. 



Fig. 1. Streptelasma rusticum. 



Fig. 2. Streptelasma cf. divaricans. 



Fig. 3. Lichenocrinus tuberculatus, magnified. 



Fig. 4. Dalmanella jugosa subplicata. A, B, brachial valves; C, pedicel valve. 



Fig. 5. Hebertella alveata. A, brachial valve; B, C, pedicel valves. 



Fig. 6. Rafinesquina breviusculus. A, B, pedicel valves, on the same slab 



with 10A; C, D, interiors of brachial valves; b, c, outlines of the 



corresponding valves. 

 Fig. 7. Leptaena unicostata. Type. A, pedicel valve; B, interior of brachial 



valve; a, b, outlines of the corresponding valves. Maquoketa strata, 



Savannah, Illinois. 

 Fig. 8. Rafinesquina pergibbosa. A, B, pedicel valve and lateral view of 



the latter; C, D, interiors of brachial valves. 

 Fig. 9. Rafinesquina alternata. Interior of brachial valve. 

 Fig. 10. Strophomena parvula. A, brachial valve. 



PLATE V. 



Fig. 10. Strophomena parvula. B, C, D, brachial valves; E, interior of pedicel 



valve; F, interior of brachial valve. 

 Fig. 11. Strophomena neglecta. Interior of pedicel valve. 

 Fig. 12. Strophomena vetusta. A, pedicel valve; B, interior of pedicel valve. 

 Fig. 13. Platystrophia clarksvillensis. Pedicel valve. 

 Fig. 14. Platystrophia acutilirata. Brachial valve. 

 Fig. 15. Zygospira recurvirostris turgida. A, pedical valve; B, brachial 



valve; both enlarged; C, lateral view, with brachial valve on left 



side. 

 Fig. 16. Archinacella kagawongensis; not the type. A, viewed from above; 



B, lateral view. 

 Fig. 17. Hormotoma gracilis, var. 

 Fig. 18. Lophospira bicincta. 

 Fig. 19. Orthoceras sp. Curvature of septa limiting chamber A shown 



separately. 



