ART. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER. 



99 



Genus LEIOSOECIA Canu and Bassler, 1920. 



1920. Leiosoecia Canu and Bassler, North American Early Tertiary Bry- 

 ozoa, Bull. 106, U. S. National Museum, p. 823. 



Zoarium consisting of cylindrical tubes and regular, parietal 

 mesopores. 



The genotype, although figured by us in 1920, was not described, 

 so that we have added notes concerning it below. 



Genotype. — Leiosoecia {Multicrescis) parvicella Gabb and Horn. 

 Cretaceous of New Jersey. 



LEIOSOECIA CONSTANTII D'Orbigny, 1850. 



1841. Hcteropora dichotoma Miciielin, Iconographie zoopliytologique, p. 



4. pi. 1, fig. 11 (not Goklfuss, 1830). 

 1850. CeHopora constantn d'Orbigny, Prodrome de pal^ontologie strati- 



graphique, vol. 7, p. 143. 

 1854. Hcteropora constantii d'Orbigny, Pal^ontologie fraugaise, Terrain 



Crot-Mv. vol. .'5. p. 1071. pi. 799, fig. 6, 7. 



A 



Fig. 2G. — Leiosoecia constantii D'Orbigny, 1850. 



A. Longitudinal section, X 16, showing the cylindrical tubes with vesicular 

 walls. 



B. Portion of the same section, X 65, exhibiting the vesicular structure in 

 more detail. 



C. Part of a transverse section, X 16. 



D. Tangential section, X 16. 



Lower Cretaceous (Aptian) : Ervy, France. 



We have discovered the ovicell of this species; it is not good 

 enough to be figured, but it undoubtedly belongs to this genus because 

 all the ovicells of the genus resemble each other. 



