824 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 

 PARLEIOSOECIA, new genus. 



The prefix "par" indicates the presence of club-shaped tubes. 

 The tubes are club-shaped, bent at right angles at their extremity, 

 mesopores are numerous with vesicular walls. 



Genotype. Parleiosoecia jacksonica, new species. Jacksonian. 



The 



Dx25 



Ex25 



FIG. 273. Leiosoecia, new genus. 



A-F. Leiosoeoia (Multicrescis) parvicella Gabb and Horn, 1800. A-C. Three views of ovi- 

 celled specimens, X 12, showing that the ovicell obstructs a number of the zooecia. D. Tangen- 

 tial thin section, X 25. E. Transverse thin section, X 25. F. Vertical thin section, X 25, 

 showing the cylindrical tubes and the mesopores. 



Upper Cretaceous (Vincentown marl) at Vincentown, New Jersey. 



PARLEIOSOECIA JACKSONICA, new species. 



Plate 148, figs. 1-13. 



Description. The zoarium is free, solid or hollow, irregularly cylindrical and 

 branched; sometimes clinging to algae or to bryozoa, sometimes attached to the 

 substratum by an expanded base. The tubes are club-shaped in the great part 

 of their length, bent and cylindrical at their extremity (sections) ; the peristome 

 is orbicular, thin, somewhat salient. The mesopores are numerous, polygonal 

 with vesicular walls (section). The ovicell is orbicular, globular, very salient, 

 absolutely smooth. 



