CYCLOSTOMATOUS BRYOZOA CANU AND BASSLEE. 



107 



species has been confused by Filliozat with Ditouxia anomalopora 

 Goldfuss, 1827. The ovicell is globular and convex when it is 

 placed on the zoarial margins; on the fronds it is scarcely convex 

 and is overlapped by the cellular margins according to the rule in 

 the Leiosoeciidae. This difference arises from the peripheral 

 growth of the fronds. The ovicell, at first marginal on the young 

 fronds, becomes more central and more embedded when the fronds 

 grow in width and thickness. 



The mesopores are small, but the difference between them and the 

 tubes is visible only in the tangential sections. 



Fig. 30. — Chilopora cretacea, new species. 



A-C. Transverse, tangential and longitudinal sections, X 16. 

 Cretaceous (Santonian) : Vendome (Loir-et-Cher), France. 



In longitudinal sections the tubes are much more regular than in 

 the Jurassic species; they are regular, cylindrical, very little nar- 

 rowed at their base. The median lamella is thick. The mesopores 

 are short and parietal. On the transverse section the median lamella 

 entirely traverses the preparation, for the growth is peripheral. 

 On the Jurassic species and in the genus Ditaxia. it is central and 

 never reaches the zoarial margins, for the growth occurs solely on 

 the superior part of the frond. 



Occurrence. — Cretaceous (Coniacian) ; Phellippeaux (Charente), 

 France. 



Cretaceous (Santonian) : Vendome (Loir-et-Cher) and Bedoclieau 

 (Charente), France. 



C oty pes. —C?in\\ collection and Cat. No. 68955, U.S.N.M. 



