Eete. 



862 



scribed the whole form of the frond as cup- shaped. Clinton 

 formation at Dayton, Ohio. See also Pal. Ohio, Vol. 2, 1875^ 



page 111, plate 5, tig. 2, natural size^ bit of frond ; 3, enlarged 

 striated surface; 4, much magnified cell, etc. But this may be 

 different fiom R. angulata (which has angular ridges between 

 the pores, and its pore edges are not raised) and may be called 

 R. daytonensis, Dayton, O. Clinton formation, Fa.^(Sub- 

 retepora angulata. 8. A. Miller, 1889.) 



Retepora archimedes. {Archimedes. Owen^Geol. Wis. 



Iowa and Minn., 1852, pi. 4, fig. 1, from beds f. near the top of 

 the lower (Keokuk) series of carboniferous limestone on the 

 Mississippi river; lb, magnified piece of the spiral lace work 

 which surrounds the central stem of the coral. See Owens' 

 art. in Silliman's Journal " Regarding human foot marks,'^ 

 1842, where the first drawing of this famous fossil appeared. 



