ART. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLEK. 71 



Affinities. — Discocytis is a discoidal Truncatula^ but it differs in 

 its much larger ovicells and in its subcylindrical tubes. 



The genus Bicavea D'Orbigny, 1853, presents also a cupuliform or 

 discoidal zoarium with zooecia grouped in radial bundles. Unfortu- 

 nately the ovicell is unknown, and we are not able to find specimens 

 to make the necessary sections. 



DISCOCYTIS EUDESI Michelin, 1844. 



Plate 28, figs. 10-15. 



1844. Pelagia cudesi Michelin, 1844, Iconographie zoophytologique, p. 123, 

 pi. 32, fig. 5. 



1909. Discocytis eudesi Gregory, Catalogue Fossil Bryozoa in British Mu- 

 seum, Cretaceous, p. 100 (Bibliography, geological distribution.) 



Structure. — The characteristic of the species is the extraordinary 

 size of the ovicells, which measure from 1.5 mm. to 2 mm. in length. 



Discocytis eudesi Michelin, 1844. 



Longitudinal (median) section through a zoarium, X 12, passing through the 

 middle of a pinnule on the right and between two pinnules on the left. The 

 thick walled nematopores of the basal surface are quite evident. 



Cretaceous (Cenomanian) : Le Mans (Sarthe), France. 



We have counted as many as 10 on the same specimen. This very 

 unusual fecundity accounts for the great number of specimens which 

 have been found and which occur in all the museums of Europe. In 

 spite of its fecundity, the species has not a great geographic exten- 

 sion, but remains restricted to the French Cenomanian. 



The median section taken between two pinnules shows a series of 

 elongated or spindle-like lozenge shaped areas; they result from the 

 20107— 22— Proc. N. M. vol. 61 36 



