Plate SO. 



Fws. 1-14. StoiiKK-hdoscHa cnistiicoUis Cnmi and Hitssler, 1017 (p. 433). 



1. Fragments of the bifoliate zoarial frond.s, natural size. 



2. Portion of a broad zoarium. X 20, exLibiting tbe usual characters of the zooecia 



without ovicells. 



3. A narrow zoarium, X 20. showing the tremopores of constant size. 



4. Zooecia, X 20. with well developed rimule spiramen and zooecial outlines little 



distinct. 



5. Surface of an old zoarium, X 20, with the zooecia separated by a distinct thread 



and the anterior projection of the peristome little conspicuous. 



6. Another surface, X 20, with the peristome more reduced. 



7. Old zooecia, X 20, with peristomes almost wanting. The olocyst and tremocyst are 



visible. 



8. Surface of zoarium with ovicelled zooecia, X 20. The tremopores are inconspicuous 



on account of fossiliz.-itiim and the peristome is not salient. 



9. A normal zoarium with ovicelled zooecia, X 20. 



10. Tangential thin section, X 100, passing through the olocyst and showing the begin- 



ning of the tremopores. 



11. View of the interior of the zooecial frontal, X 20. The zooecial and avicularian 



cavities and the small beginnings of the tremopores ai'e visible. 



12. Drawing of longitudinal section, X 20, showing the apertura (np), olocyst, {ol), 



ovicell, (oil), peristomice {pic), trempores (tr), and zooeeium (:;). The walls are 

 very thick. 

 13, 14. Transverse thin section, X 20, and a portion of the same, X 50, illustrating the 

 thick zooecial walls of which there is a special one for each zooocium. 

 Vicksburgian (Glendou member of Marianna limestone) : West bank of Conecuh 

 River, Escambia County, Alabama. 

 Cat. No. 62593, U.S.N.M. 

 Figs. 1.5-20. Enoplostomella magniporo.ya, new species (p. 43!)). 



15. Fragments of the free bifurcating zoarium, natural size. 



16. Zooecia. X 20, with tremopores coalesced, giving an unusual appearance. 



17. Dorsal side of mature zoarium, X 20. The zooe<:-ia are separated by sharp ridges 



and are provided with large tremopores. 

 IS. Dorsal of a young specimen, X 20. 



19. Fi'ontal side of the same specimen, X 20, with one ovicelled zooecium. 



20. Normal zooecia, X 20. The wide rounded rimule spiramen, the oral avicularium 



almost within the peristomie and the very large tremopores are to be noted. 

 Vick.sburgian (By ram marl) : Byram, Mississippi. 

 Cat. No. 64289, U.S.N.M. 

 90 



