AHT. 22. 



CYCLOSTOMATOUS BRYOZOA CANU A:ND BASSLER. 



76 



inesopores quite visible on the specimens and in tangential sections, 

 and in the occurrence of the apertures on the trunk and on the pin- 

 nules. 



SEMICYTIS DISPARILIS D'Orbigny. 1854. 



Plate 26, figs. 1-^. 

 1909. Hotnoeosolen disparilis Gregory, Catalogue Fossil Bryozoa in British 

 Museum, Cretaceous, p. 89, pi. Ill, fig. 8 (Bibliography, Geological 

 distribution). 



Structure. — The apertures are distributed on the principal trunk of 

 the zoarium and on the pinnules ; between them are placed the meso- 



FiG. 16. — Semicytis disparilis D'Orbigny, 1854. 



A. Transverse section, X 16, through a thick branch. 



B. Transverse section, X 16, cutting a pinnule. 



C. Longitudinal section, X 16, through an ordinary branch. 



D. Portion of a longitudinal section, X 16, showing the thick dorsal perfo- 

 rated by the vacuoles and also possibly the central canal. 



Cretaceous (Coniacian) : Tours and Villedieu. France. 



pores irregularly arranged and generally smaller. The mesopores 

 and the apertures have the same elongated fonn and are equally 

 oblique. 



