I'LATE 21. 



Fig. 1. ilcinhnuiiiiiiriiw bcnjainiiii C.-iiui aud Ba.ssler. HUT (p. !»8). 



Surface of the type-specimen, X 20. Tlie large zooecia with tlie incomplete small 



caual iu the opesiiuu are to be noted. 

 Middle Jacksouiau : Rich Hill, Crawford County. Georgia. 

 Cat. Xo. 62569, I'.S.N.M. 

 Figs. 2-4. Acanlhodesia savartii Audouiii, 1826 (p. 10(ii. 



2. An incnisting zoarium, X 20. with long zooec-ia. 



3. Another zoarinni, X 20, exhibiting broad zooecia. 



Vicksburgian ('•Chimney rock" of Marianna lime.stone) One mile north of Monroe- 

 ville, Alabama. 



Cat. No. 63874. U.S.X.M. 



4. A slightly abraded specimen, X 20, with the Dpesial ileuticle and the septnlae visible 



in some zooecia. 

 Vicksburgian ("Chimney rock" of Marianna limestone). Three miles southeast of 

 Vosburg. Jasper County, Mississippi. 

 Cat. No. 63875, U.S.N.M. 

 Figs. 5-7. Adeiiifera iuarninta Caiiu and Bassler. ]!)17 (p. 102). 



5. Portion of the unilamellar zoarium, X 2(i. The distal elevation ot the mural rim 



is well developed. 



6. Another zoarium, X 20, in which the distal thickening exhibits the two gland 



openings. 



7. Dorsal side of zoarium, X 10, showing the proudvuiced hydrostatic tuberosities. 

 Middle Jacksonian : near Lenuds Ferry. .South Carolina. 



Cat. No. 62570, U.S.N.M. 

 Figs. S-14. Otionelhi cara. new species (p. lOS). 



8. Several fragments, natural size, of the orbicular Zdariuni. 



9.10. Views of two zoaria, X 20. The arrangement of the zooecia in (lulncunx and the 

 large auriculated vibracula are characteristic. 



11. \iew of dorsal side, .X 20, showing small hydrostatic tuberosities. 



12. A zoarium, X 20. with smaller vibracula than usual. 



13. Dorsal .side, X 20. The ribs are uncaleified and the interior is tilled with a mealy 



powder. 



14. Dorsal side. X 20, showing the hollow radial ribs. 



Middle Jack.sonian : Baldock, Harnwell County. South C;irolina. 

 Cat. No. 63876, U,S.X.M. 

 Figs. 15-17. Hiiirh-xind Kiiiilhi. new species (p. 11.3). 



15. Surface of the incrusting zoarium. X 20. Several zooecia are provided with ovicells. 



16. Another portion of the same zoarium, X 20, where the spines are especially well 



develoi>ed. Several ovicelled zooecia are present. 

 IT. A third portion of the type, X 20, exhibiting the normal features. 

 Middle Jacksonian : Eutaw Springs, South Carolina. 

 Cat. No. C3877, T'.S.X.M. 

 22 



