Plate 80. 



Fig. 1. Herpetoimra (hiiiica Lang, 1911 (p. Sli. 



A zoai-iiim, X 20, branching unilaterally. The zooecia show the absence of the basal 



olocyst and their oaudul portion very little develoiJed if at all. 

 Vicksbnrgian ("Chiunioy rock" of Marianna limestone): 1 mile north of Monroe- 

 ville. Alabama. 



Cat. No. 64229, U.S.N.M. 

 Figs. 2-7. Mciiibraniporina tubulosa, new species (p. 9S). 



2. Two of the small tubular zoarla, natural size. 



3. Fragment of a broken zoarium, X 20, exhibiting the hollow interior and the septuhie 



of the lateral walls. 



4. Portion of a normally growing zoarium. X 20, with the usual characters of the 



zooecia. 



5. Zoarium of abnormal growth, X 20, with distorted zooecia at the upper end and a 



calcified zooecium in the lower part. 



6. A bifurcated zoarium, X 20. 



7. Tangential thin section, X 100, illustrating microscopic structure of the frontal wall. 

 Vicksburgian ("Chimney rock" of Marianna limestone): 1 mile north of Monroe- 



ville, Alabama. 



Cat. No. 64230, U.S.N.M. 

 Figs. S-11. Meiiibraiiiporina arcana, new species (p. 99). 



8. A fragment, X 20, preserving only four broad zooecia. 



9. 10. Two small fragments of zoaria, X 20, with zooecia of the more usual type and 

 with several ovicell-like structures in their proximal portion. 

 11. A more complete fragment, X 20, with elongated zooecia and two of the supposed 

 ovicells. 

 Vicksburgian ("Chimney roclc " of Marianna limestone): I mile north of Mouroe- 

 ville, Alabama. 



Cat. No. 64231, U.S.N.M. 

 Figs. 12-1.5. Hincksina elrgans, new species (p. 11.5 i. 



12, 13. Two well preserved fragments, X 20, with the characteristic specific characters, but 

 without ovicells. 



14. A worn zoarium, X 20, but having the spines still visible. 



15. Surface of a zoarium, X 20, with some zooecia i)reserving ovicells. 



Vicksburgian ("Chimney rock" of Marianna limestone) : 1 mile north of Mouroe- 

 ville, Alabama. 



Cat. No. 64232, U.S.N.M. 



55899— 20— Bull. 106 11 81 



