NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
735 
Occurrence . — Midwayan (Clayton limestone) : Mabelvale, near Little Lock, 
Arkansas (very rare). 
Holotype. — Cat. No. 65439, U.S.N.M. 
ENTALOPHORA CRASSA, new species. 
Plate 113, figs. 1-5. 
Description — The zoarium is free, cylindrical, very large. The tubes are cy- 
lindrical, very little distinct, often wrinkled transversally ; the peristomes are 
thick, very salient, orbicular, close to one another, sometimes adjacent two by two. 
Diameter of the peristome 0.14 mm. 
Diameter of the apertura 0.06-0.08 mm. 
Distance between the peristomes 0.40-0.54 mm. 
Separation of the peristomes 0.46-0.70 mm. 
Diameter of the branches 3.00 mm. 
M easurements . — • 
Variations . — In longitudinal section the tubes are very long, rarely branched. 
In transversal section they are polygonal. 
Occurrence . — Claibornian (Gosport sand) : One mile southwest of Rockville, 
Clarke County, Alabama (rare). 
TIolotype. — Cat. No. 65431, U.S.N.M. 
Genus MICROECIA Canu, 1918. 
1918. Microecia Cantj, Les ovicelles des Bryozoaires cyelostomes, Bulletin Societe Geologique 
France, ser. 4, vol. 16, p. 325. 
The ovicell is very small and is spread between only four tubes ; the oeciostome 
is small and hardly salient. 
Genotype. — Berenicea samiensis Norman, 1864. 
Range.- — Senonian-Recent. 
The previously known species belonging to this genus are : 
Berenicea samiensis Norman, 1864. Recent. 
Diastopora tubuh/s D’Orbigny, 1851. Senonian. 
Berenicea sub orbicularis Hincks, 1880. Recent. 
In the absence of the oeciostome the differentiation of this genus from Oncou- 
soecia is very difficult. 
MICROECIA FLABELLATA, new species. 
Plate 128, figs. 19, 20. 
Description . — The zoarium incrusts shells and bryozoa; it is jlabellate , eccen- 
tric. The tubes are little distinct, flat, smooth, horn-shaped, very narrow proxi- 
mallv, grouped on the zoarial margins in false radial rows; the peristome is 
elliptical, thin, sharp. The ovicell is small, globular, salient; the oeciostome is 
isolated and hardly salient. The zone of growth is thick but little wide. 
Measurements — I Diameter of tlie peristome 0.14 mm. 
I Distance between the peristomes 0.60-0.70 mm. 
