APPENDIX III. Flint Ridge Bryozoa. 
BY A. F. FOERSTE. 
The following bryozoa, from Flint Ridge and the equivalent strata 
at Bald Hill, are the result of several days’ collecting at each locality. 
Considering the wealth of bryozoa in the Carboniferous formations of 
America, the literature is scanty and frequently very unsatisfactory. 
Hiram A. Prout described about thirty- five species in the Trans. St. 
Louis Acad. Sci., from 1858 to i860. James Hall described about 
eight species, in the Proc. Am. Ass’n. Adv. Sci. in 1857, and three 
species in the Geo. Rep. of Iowa, in 1858. F. B. Meek, alone and 
in conjunction with Worthen, published about nine species. Romin- 
ger, Dawson, Geinitz, White, Nicholson, and Swallow have each added 
one or more species at various times. To these, E. O. Ulrich has 
added about eighteen species in his American Paleozoic Bryozoa, pub- 
lished from 1882 to 1884. To these publications of Mr. Ulrich I am 
greatly indebted, as will appear throughout the following notes. Until 
some of the species published by Prout and others are better under- 
stood, the work on Carboniferous bryozoa will remain rather unsatis- 
factory. It is hoped that the following notes will at least not further 
involve this subject. 
RHABDOMESONTIDyR, Vine. 
Ramose bryozoa ; cells radiating in all directions from the central 
axis, of one kind only, tubular, with an expanded aperture, and an 
angular immature region. 
Genus RHOMBOPORA, Meek. 
Branches slender ; cells radiating from an imaginary central axis; 
aperture oval, placed at the bottom of concave, rhomboidal or hexag- 
onal “vestibules,” the latter separated by spines, frequently arranged 
in one or more rows along the dividing ridges. 
