NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



Family ONCOUSOECIIDAE Canu, 1918. 



687 



The axis of the ovicell is parallel to that of the tubes. The ovicell is developed 

 at the same time as the adjacent tubes, which are not disarranged in their respective 

 position. 



We have been able to recognize two genera, Oncousoecia Canu, 1918, in which 

 the ovicell is a dilation of the entire exterior part of the tube, and Peristomoecia 

 when the peristomie alone forms the ovicell. 



FIG. 226. Genus Oncousoecia Canu, 191.8. 



A, B. Ovicellecl zoariuni natural size and enlarged of Oncousoecia (Tvbnlipora) lobulata 

 Hincks, 1880. Recent. 



C. Ovicelled zoarium of Oncoiisoecia (Crisia) schmitzi Pergens, 3890. Cenomanian. 



D. Ovicelled zoarium, X 12, of Oncousoecia (Filisparsa) bifnrcata Ulrich and Bassler, 1907. 

 Cretaceous (Vincentown) of New Jersey. 



Genus ONCOUSOECIA Canu, 1918. 



1918. Oncousoecia CANU, Les ovicelles des bryozoaires cyclostomes, Bulletin Societg Geo- 

 logique de France, ser. 4, vol. 16, p. 325. 



The ovicell is a dilation of the entire exterior visible part of the tube. The 

 oeciostome is not turned toward the base. Fourteen tentacles. 



Genotype. TubnUpora lobulata Hincks, 1880. 



Range. Maastrichtian-Recent. 



The exact limit between this genus and Mecynoecia is rather difficult to de- 

 termine when one can not verify the abortion or the derangement of the adjacent 

 tubes by dissection. 



The ovicells are generally pyriform, but they are differently arranged; some 

 have the point above and others have it below. This distinction does not appear 



