NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
679 
Ceriopora micropora Golclfuss, 1827, lias been identified by Ulrich in the 
Eocene of Maryland, but the single specimen found is not sufficient for a detailed 
study. 
CERIOPORA VESICULOSA, new species. 
Plate 111, ligs. 5-10. 
The zoarium is massive and subelliptical. The orifices are polygonal and are 
0.10 mm. in width at the maximum. The walls of the tubes are vesicular. Dia- 
phragms are rare. There are many concentric lines of large vesicles. 
Affinities.- — The concentric lines of large vesicles give this species, in longi- 
tudinal sections, the aspect of Reptomulticava. However, there is no real separa- 
tion between the successive layers apparent and there are no superposed subcol- 
onies. 
Occurrence- — Midwayan (Clayton limestone) : Mabelvale, near Little Rock, 
Arkansas (rare) ; Luverne , Crenshaw County, Alabama (very rare) ; 1 mile west 
of Fort Gaines, Georgia (common). 
Holotype.- — Cat. No. 65255, U.S.N.M. 
CERIOPORA ALDRICHI, new species. 
Plate 151, figs. 11-17. 
Description. — The zoarium incrusts small cylindrical bodies, rootlets, small 
algae or branching bryozoa; it is hollow or solid. The walls of the cylindrical 
tubes are vesicular only at their extremity. The orifices are polygonal and measure 
0.14-0.16 mm. in width. 
This interesting and abundant species is named in honor of Mr. T. H. Aldrich, 
of Birmingham, Alabama, in recognition of his work upon the Tertiary paleon- 
tology of the United States. 
Occurrence.— Middle Jacksonian (Castle Hayne limestone) : Wilmington 
North Carolina (common). 
Cotypes. — Cat..- No. 65370, U.S.N.M. 
CERIOPORA (?) PROPOSITA, new species. 
Plate 151, figs. 7-10. 
Description. — The zoarium is spread out in irregular masses, much compressed, 
nonglobular, with the lower face covered by a striated epitheca. The orifices are 
polygonal and measure 0.12 mm. at the maximum. The walls of the tubes are 
irregularly vesicular. There are many concentric lines of large vesicles. 
Affinities. — The species, in longitudinal sections, somewhat resembles Ceriopora 
vesiculosa in its concentric lines of large vesicles, but differs from it in its expanded, 
nonmassive, and nonglobular zoarium. 
Occurrence. — Middle Jacksonian: Three and one-fourth miles south of Perry, 
Georgia (common). 
Holotype. — Cat. No. 65369, U.S.N.M. 
