CYCLOSTOMATOUS BKYOZOA CANU AND BASSLER 



49 



Measurements. — Diameter of aperture, 0.16 mm.; diameter of peri- 

 stome, 0.20 mm. ; distance of peristomes, 0.48-0.56 mm. ; separation of 

 peristomes, 0.72 mm.; di- 

 ameter of branches, 3 mm. 



Structure. — In longitud- 

 inal sections the tubes are 

 short, club-shaped, much 

 expanded at their termi- 

 nal parts, sometimes 

 showing pseudofacettes. 

 The gemmation is dorsal, 

 although triparietal in 

 appearance because of the 

 little length of the tubes. 

 The walls are moniliform, 

 much widened at their 

 extremity. 



In transverse sections 

 the tubes are rounded, 

 much smaller at the cen- 

 ter than at the circumfer- 

 ence, with vesicular walls 

 much thickened, espe- 

 cially at the periphery. 



Occurrence. — Lower 

 Cretaceous (Aptian) : 

 Faringdon, England 



Fig. 22.— Noloplagioecia faringdonensis Canu and Bassler, 1922. 

 (common) . a, B. two transverse sections, X 16. C. Longitudinal section, 



CotweS. Cat. No. ^ le, showing the club-stiaped tubes, the pseudofacettes, and 



r.or,if-, XT o AT Ti *• the vesicular walls. Lower Cretaceous (Aptian): Faringdon, 



68718, U.b.N.M. England 



Genus CEA D'Orbigny, 1852 



CEA GRANULATA, new species 



Plate 5, figs. 6-14 



Description. — The zoarium is free, formed of narrow, compressed 

 bifurcated fronds. The tubes are rarely visible. The orifices with- 

 out facette are large, polygonal, irregular, elongated or transverse. 

 The facettes are indistinct, flat, granular. The peristomes are orbi- 

 cular, tliin, salient, arranged in quincunx. The zone of growth is 

 large, becoming thinner on the median lamella. 



Measurements. — Diameter of aperture, 0.10 mm.; diameter of peri- 

 stomes, 0.14 mm.; distance of peristomes, 0.40 mm.; separation of 

 63648—26 4 



