SHUMARD——-BLASTOIDEA. 239 
Dimensions—Angle of divergence of sides, 46°; length, 
0.42 of an inch; width at summit, 0. at; length of base, 0.14; 
width of same, 0.14. 
Our species differs from C. acutus (McCoy), by its more 
slender form, narrow base, convexity of the Fe fi other 
characters 
in the Devonian strata of the Falls of the Ohio, and 
on peaeerans Creek, near cea Kentucky; also in the 
vieinity of Columbus, Ohio. - eautiful examples of this spe- 
cies are to be foun d in the nr of my friend, Dr. L. P. Yan- 
dell, at Louisville, Ky. 
CopasTER Americanus, JV. sp. 
