POLYZOANS. 35 



Rhombopora lepidodendroides MEEK. 



Plate xxxiii, figs. 4a-b. 



Rhombopora lepidodendroides Meek, 1872 : U. S. Geol. Sur. Nebraska, p. 



141, pi. vii, figs. 2a-f. 

 Rhombopora lepidodendroides White, 1875: Expl. and Sur. w. 100 Merid., 



vol. IV, p. 99, pi. vi, fi?s. 5a-d. 

 Rhombopora lepidodendroides Keyes, 1888: Proc. Acad. Nat. Sci., Phila., 



p. 225. 



Eamose slender, cylindrical or slightly compressed, and 

 bifurcated at regular, distant intervals; divisions nearly 

 straight between the points of bifurcation, where they diverge 

 at angles of about 70 to 80; composed of small, short, nearly 

 round, tapering tubes that ascend from an imaginary axis ob- 

 liquely outward, with a more or less curve to the surface, near 

 which they are separated by interspaces, which in cross-sec- 

 tions show the minute celluar structure; calyces arranged very 

 regularly in quincunx, so as to form vertical and oblique rows ; 

 distinctly rhombic at the surface, where their margins are 

 roughened by small prominent, node-like grains, placed one at 

 each corner, with smaller granules along the edges between. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Bactropora simplex ULRICH. 



Bactropora simplex Ulrich, 1890 : Geol. Sur. Illinois, vol. VIII, p. 663, pi. 

 Ixx, figs. 14-145. 



Horizon and localities Lower Carboniferous, Keokuk 

 limestone: Clark county. 



Streblotrypa major ULRICH 



Streblotrypa major Ulrich, 1890: Geol. Sur. Illinois, vol. VIII, p. 666, pi. 

 Ixxi, figs. 8-8d. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Keokuk ( Iowa ). 



Streblotrypa radialis ULRICH. 



Streblotrypa radialis Ulrich. 1890: Geol. Sur. Illinois, vol. VIII, p. 667, 

 pi. Ixxii, figs. 2-2d. 



Horizon and localities. Lower Carboniferous, Keokuk 

 limestone : Bentonsport ( Iowa ). 



