CYCLOSTOMATOUS BRYOZOA — CANU AND BASSLER 



29 



mm, 



CERIOPORA DIMORPHOCELLA, new species 



Plate 24, figs. 1-6; Plate 31, figs 7, 8 



Description. — The zoarium is free, subcylindrical, with short, lobed 

 branches. The tubes are thick; the apertures are polygonal, with 

 two different sizes, and ornamented with very small tongues. 



Measurements. — Diameter of large apertures, 0.08 mm.; diameter 

 of small apertures, 0.04 mm.; zoarial diameter, 10 mm.; minimum 

 height of fragments, 20 mm. 



Structure. — The fragments found do not show the base; the colony 

 should be, therefore, rather large and dendroid. An examination of 

 the surface indicates a Heteropora; the large apertures are surrounded 

 by smaller ones, which are 

 rather regular in their dimen- 

 sions. But in meridian sec- 

 tions there are no mesopores; 

 the small orifices correspond to 

 the ordinary tubes, in which 

 the walls are thicker on the zo- 

 arial margin. This phenom- 

 enon is, moreover, rather ir- 

 regular, as tangential sections 

 indicate. There are neither 

 diaphragms nor zonal lines. 



Ajjinities. — This species 

 differs from Ceriopora fallax 

 in its much larger zoarium 

 and in its smaller micrometric 

 dimensions. 



Occurrence. — Lower Creta- 

 ceous (Aptian) : Faringdon' 

 England (rare). 



Cotij pes. —Ca.t. No. 69872, 

 U.S.N.M. 





FiQ. li.— CenopoTa dimorphocella, new species. Portion of 

 a meridian section, X 16. Lower Cretaceous (Aptian): 

 Faringdon, England 



REPTOMULTICAVA FUNGIFORMIS Gregory, 1909 



Plate 24, figs. 11-17 



1909. Reptomulticava fungiformis Gregory, Catalogue of the Cretaceous Bryozoa 

 in the British Museum, vol. 2, p. 135, figs. 38, 39, pi. 7, fig. 6. (Bib- 

 liography.) 



Structure. — Our specimens are much smaller than those in the 

 British Museum, although their appearance is identical. Moreover, 

 the aperture is much smaller (0.10-0.12 mm. and not 0.20 mm.), 

 although its form is similar to that figured by Gregory. Finally, our 

 sections are quite similar to those of the English author. It appears 



