CYCLOSTOMATOUS BEYOZOA CANU AND BASSLER 



25 



thickened and are moniliform. The zonal lines are irregular and 

 may be transformed partially into basal lamellae. 



Affinities. — In its zoarial form this species approaches Ceriopora 

 aequipedis but differs in its large zoarium, its much larger aperture 

 (0.16 mm. and not 0.12 mm.), and, in sections, in the irregularity^ of 

 the zonal lines. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix (Vaud), 

 Switzerland (rare). 



Cotypes.—Csit. No. 69866, U.S.N. M. 





Fig. ^.— Cerio-pora solida, new species. Meridian section, X 16. Lower Cretaceous (Valangian): Sainte- 

 Croix, Switzerland 



CERIOPORA PARVIPORA, new species 



Plate 23, figs. 5-7 



Description. — The zoarium is large, globular, with a concave, nar- 

 rowed base. There are false enveloping lamellae. The tubes are 

 thick; the apertures are polygonal and irregular. 



Measurements. — Diameter of aperture, 0.08 mm.; diameter of 

 zoarium, 7 mm. 



