CYCLOSTOMATOUS BRYOZOA — CANU AND BASSLER. 



89 



the walls of which as seen in tangential section are vacuolar. In 

 longitudinal section the tubular walls appear also vacuolar but very 

 irregularly so. The tubular walls of the central bundle are plain. 



Fig. 19. — Cyclocites primogenitum, new species. 



A. Portion of transverse section, X 16, sliowing structure of central tubes. 



B. Ti-ansverse section, X 16. 



C. Tangential section, X 16, illustrating the ves'cular structure of the walls. 



D. Portion of a longitudinal section, X 16, with the facettes still preserved. 



E. Longitudinal section, X 16, exhibiting the central bundle of cylindrical 

 tubes and the thickened lateral tubes with vesicular walls. 



Jurassic (Bathonian) : Ranville (Calvados), France. 



Occurrence. — Jurassic (Bathonian) : Ranville (Calvados), France. 

 C oty'pes.—Q,2im\. collection and Cat. No. 68940, U.S.N.M. 



CERIOCAVIDAE, nev/ family. 



The ovicell is a long, transverse, convex, regular, symmetrical vesi- 

 cle with special walls. The oeciostome is large, median, tubular,- 

 salient. 



The ovicell closes a certain number of tubes which are necessarily 

 aborted ; it is necessary, therefore, to classify this family in the sec- 

 tion of the Rectangulata. This family differs from the Plagioeciidae, 



