NORTH AMERICAN EARLY TERTIARY BRYOZOA. 711 



Measurements. Diameter of the peristomes 0.13 mm. 



Affinities. In its zooecial arrangement this species is very close to Plagioecia 

 concreta, but differs from it in its incrusting habit of growth, and in its somewhat 

 smaller micrometric measurements. 



The only specimen so far discovered has been figured and comparisons with 

 other species are evidently provisional. 



Occurrence. Midwiiyan (Clayton limestone) : Well at Brundidge, Alabama 

 (very rare). 



Holotype.C&t. No. 65425, U.S.N.M. 



PLAGIOECIA BRUNDIDGENSIS, new species. 



Plate 109, figs. 13, 11. 



Description. The zoarium incrusts terebratuloid brachiopods, in irregular 

 lobes. The tubes are small, distinct, cylindrical, somewhat bent upward at their 

 extremity; the peristome is thin, little salient, elliptical. The ovicell is very 

 convex, transverse, short. The zone of growth is invisible. 



Diameter of the peristomes 0.08-0.10 mm. 



Measurements. 



Distance between the peristomes 0.28-0.31 mm. 



Separation of the peristomes 0.28 mm. 



Occunvnce. Midwayan (Clayton limestone) : Well at Brundidge, Alabama 

 (very rare). 



PLAGIOECIA TUBIFER, new species. 







Plate 112, figs. 9-12. 



Description. The zoarium creeps over shells or on algae and emits tubular 

 hollow expansions. The tubes are indistinct, with porous surface, arranged in very 

 irregular quincunx; the peristome is large, salient, very thin, orbicular. The 

 ovicell is short, little convex, transverse, elliptical. The zone of growth is scarcely 

 visible. 



Measurements. Diameter of the peristome 0.11-0.16 mm. 



Occurrence. Wilcoxian (Bashie formation) : Woods Bluff, Alabama (rare). 



Cotypes.C&t. No. 65265, U.S.N.M. 



PLAGIOECIA CONCRETA, new species. 



Plate 123, tigs. 1-14. 



Description. The zoarium is free, unilamellar, formed of aggregated sub- 

 colonies, orbicular, adjacent, and superposed. The tubes are distinct, cylindrical, 

 terminated by a short, oblique, peristome, slightly striated transversally, arranged 

 in quincunx. The peristome is round and oblique, or horizontal and elliptical. 

 The ovicell is large, arched, parallel to the zoarial margins, very convex. The 

 zone of growth is narrow and somewhat thick on the aggregated zoaria; it is 

 very wide on the simple zoaria. 



