was cut , 
and the cut surface of each remaining piece polished. 
Dune an ’ s 
type had "been cut and the surface of one piece polished. 
I had the other piece polished. I therefore had for study four 
polished surfaces and one thin section. Excepting size there 
is practically no difference "between the specimens. 
The species is a Turhinolid and exhibits no characters 
"by which it could "be r c n t - r a-tt»d from Placotrochus . 
