CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER 



17 



Affinities. — This is a Multicrescis in which the tubes have neither 

 visors nor peristomes. We did not have enough specimens to pre- 

 pare thin sections. 



The species differs from Semimulticavea variolata Gregory, 1909, in 

 its much smaller micrometric dimensions. It differs from Heteropora 

 suhaequiporosa Gregory, 1909, in its smaller micrometric measure- 

 ments and in its zoarium, which is not free. 



Occurrence. — Lower Cretaceous (Aptian) : Faringdon, England. 



Holotype.—Csii. No. 69860, U.S.N.M. 



MULTICRESCIS PULCHELLA, new species 



Plate 21, figs. 13-18 



Description. — The zoarium is free, subcylindrical, branched, hollow 

 in the interior. The orifices are circular, oblique, arranged in quin- 



Fig. 4.— Multicrescis pulchella, new species. A. Transverse section, X 16, of a hollow zoarium. The ex- 

 ternal lamella seems to have had only one tube of origin. B. Longitudinal section through the same 

 zoarium, X 16, showing the tube of origin which gave rise to the external lamella. Lower Cretaceous 

 (Valangian): Sainte-Croix, Switzerland 



cunx, ornamented with a tuberose visor placed inferiorily. The meso- 

 pores are numerous, polygonal, smaller than the orifices. 



Measurements. — Diameter of apertures, 0.06-0.08 mm.; diameter 

 of mesopores, 0.04 mm. 



Structure. — The zoarial branches are solid at their extremity. 

 When the visors are worn the aspect of the surface is that of an ordi- 

 nary Heteropora. The base is orbicular, little expanded, garnished 

 with a concentrically wrinkled epitheca. The one we figure is not 

 53648—26 2 



