PLATE XXXV 
Figs. 1 A, B. Elrodoceras indianense (Miller). A, B, lateral views of 
opposite sides of the same specimen, A showing the sutures of the septa, and 
B showing the surface striae. From some Indiana locality, in the upper 
part of the Laurel member of the Niagaran. Specimen No. 2133 in the 
Museum of Comparative Zoology, at Harvard University. Second type of 
Rhynchorthoceras dubium Hyatt. See also Plate XXXVI, Figs. lA, B. 
Figs. 2 A, B, C. Billingsites (?) ivilliamsportense Foerste. A, lateral 
view. B, more convex side, assumed to be ventral. C, less convex side, 
assumed to be dorsal. From Williamsport, Tennessee. Specimen No. 
483D5, in the U. S. National Museum. 
