NORTH AMERICAN EARLY TERTIARY BRYOZOA. 735 



Occurrence. Miclwayan (Clayton limestone) : Mabelvale, near Little Rock, 

 Arkansas (very rare). 



Holotype.CsA. No. 65439, U.S.N.M. 



ENTALOPHORA CRASSA, new species. 



Plate 133, 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 0.1-1 mm. 



Diameter of the apertura 0.06-0.08 mm. 



Measurements, 



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. 



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). 



Holotype.Cnt. No. 65431, U.S.N.M. 



Genus MICROECIA Canu, 1918. 



1918. Microecia CANLT, Les ovicelles des Bryozoaires cyclostomes, 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. Bcrcnicea samiensis Norman, 1864. 



Range. Senonian-Recent. 



The previously known species belonging to this genus are : 



Berenicea sarniensis Norman, 1864. Recent. 



Diastopora tubulus D'Orbigny, 1851. Senonian. 



Berenicea suborbiculans 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 flab ell ate, eccen- 

 tric. The tubes are little distinct, flat, smooth, horn-shaped, very narrow proxi- 

 mally, 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. ( Diameter of the peristome _i 0.14 mm. 



I Distance between the peristomes 0.60-0.70 mm. 



