NORTH AMERICAN EARLY TERTIARY BRYOZOA. 679 



Ceriopora micropora Goldfuss, 1827, has 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. 



riate 111, figs. 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.C-ii. 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). 



Holotypc.Czt. No. 65369, U.S.N.M. 



