Fauna of the Morrow Group 
133 
1908. Rhombopora aff. R. lepidodendroides. Girty, Prof. Paper, U. S. 
Geol. Surv., No. 58, p. 153, pi. 31, fig. 17. 
Delaware Mountain formation: Mountains northwest of Marathon, 
Texas. 
1914. Rhombopora lepidodendroides Price, West Va. Geol. Surv., Pres- 
ton County Rep., p. 490. 
Pine Creek and Brush Creek limestones: Preston County, West 
Virginia. 
Description, Zoarium a ramose, cylindrical, remotely bifur- 
cating branch with a diameter of about 1.2 mm., the largest 
fragment seen having a diameter of 1.6 mm. and the smallest, 
0.9 mm. None of the specimens at hand have a length greater 
than 1 cm. and none shows more than one bifurcation. Zooecia 
regularly arranged in quincunx, forming vertical, transverse, 
and intersecting spiral series around the branch, with typically 
seven apertures in each single vertical row in a space of 3 mm. 
Apertures broadly elliptical, opening into distinctly impressed 
and expanding vestibules with rhombic outlines ; interspaces be- 
tween the rhombic vestibules forming rounded or subangular 
ridges which are occupied by a single, or in some instances a 
double, row of small spiniform tubuli, with one much larger spine 
generally present at the junction angles of the ridges. The size 
of all the spines depends apparently upon the state of preser- 
vation and the small spines are generally very inconspicuous or 
not apparent. 
Horizon and locality. Morrow formation: near Ft. Gibson, 
Oklahoma (Stations 296 and 301). 
Rhombopora tabulata Ulrich 
Plate VI, figure 11. 
1890. Rhombopora tabulata. Ulrich, Geol. Surv. Ilk, vol. 8, p. 658, pi. 
70, figs. 2-2c. 
Chester group: Kaskaskia and Chester, Illinois; Sloan’s Valley, 
Kentucky. 
1894. Rhombopora tabulata. Keyes, Mo. Geol. Surv., vol. 5, p. 34. 
Kaskaskia limestone: Ste. Genevieve, Missouri. 
Ulrich’s description.. “Zoarium. a cylindrical stem from 1 to 
1.5 mm. in diameter branching dichotomously at intervals of 10 
mm. more or less. Zooecial apertures ovate, averaging 0.18 mm. 
in length, from one-half to two-thirds as wide, arranged in 
irregular series, with the transverse and diagonal lines less fre- 
quently dominant than the longitudinal. On an average five 
