Devonian Era in the Ohio Basin. — Clay pole. 
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Holonema rugosum E. W. C... 
Ganorbynchus beecheri Nby ... 
Aspidichthys clavatus Nby 
Bothriolepis leidyi Nbv 
B. minor Nby 
Callognathus regulare Nb> 
C. serratus Nbv 
Brontichthys clarki E. \V. C ... 
Cephalaspids 
Acanthaspis arinata Nby 
Acantliolepis pustulosa Nb> .... 
Chimeroids 
Rhynchodus seeans Nb* 
Rh.f rangen s Nby 
Rh. crassus Nbv 
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Note A. 
Cladodus pattersoni. 
This species, a small jaw with teeth from Vanceburg, Ky., is de- 
scribed in the Palaeontology of Ohio, (v. ii, p. 47), and referred to the 
" Waverly Black Shale." As its horizon seems rather uncertain it has 
been inserted here. No black shale is apparently recognized on that 
horizon by the Kentucky geologists (see Geo/, of A'r., vol. iii, p. 171), and 
as the Black shale is close to the spot indicated it is possibly the stratum 
intended. See also Geol. of O., vol. ii, p. 624. 
Note B. 
Orodus elegantulus. 
Polyrhizodus modestus. 
Cladodus parvulus. 
These three species are described in the Palaeontology of Ohio, but 
are omitted from the Monograph, whence the inference is legitimate 
that they were considered invalid by their author. 
* The fossils marked with an asterisk were found in the eastern part of the 
basin and are allotted to the horizon in the tables for convenience without any 
insistence on their exact correlation which the data do not usually permit. 
Speaking generally, however, the reference is as clo>e to accuracy as our 
present knowledge allows. 
