97 = 
The species, (Discina truncata, Hall isthe only representative of 
the genus Schizobolus and has been found before only in the black 
shale beds of the Upper Devonic, (Genesee and Cashaqua of New York 
and the black shale of Kentucky). The specimens in the Para 
shales are abundant and well preserved. 
No doubt exists in my mind of their specific identity and of their 
indications not only of a geological horizon in the State of Para not 
before recorded, but of physical conditions at this time in South 
America of which we have thus far had no intimation. 
Very respectfully yours, 
JcHN M. CLARKE, State Geologist .» 
