Plate 85. 



Figs. 1-3. Arnchnopiixln rirlcshurtjirn, new species (p. 311). 

 1, 2. Two views of a zoariiim iiierusting a sliell, X 20. 



3. Photograph, X 40, sliowing the zooecial structure in detail. The polygonal pieces 



pierced by a semilunate pore composing the frontal and the rectangular plate cover- 

 ing the ovicell are quite visible. 

 Vicksburgian (Bvram marl I: Bvram, MissLssippi. 

 Cat. No. 64262, U.S.N.M. 

 Figs. 4—12. Aciopora snillans, new species (p. 319). 



4. A group of the free, cylindrical, bifurcated zoaria, natural size. 



5. An unbranched zoarium, X 20. 'The ascopore is quite large and salient. 



6. A branching zoarium. X 20. with the sm.ill avicularia on the peristome and the asco- 



pore well developed. 



7. Bifurcated zoarium, X 20, with all the zooecial characters well developed. 



S. Photograph of a jirepa ration, X 20, obtained by longitudinal section. The ascojwre is 



not symmetrically placed on all the zooecia. 

 9. Ti'ansverse thin section, X 20. 



10. View of the interior of the zooecia, X 20, seen from the basal side. The ascopore, 



apertura, and the peristomie as well as the base of the tremopores showing through 

 the thin olocyst, are visible. 



11. Schematic longitudinal section through a zooeeium, X 20, illustrating the structure. 

 asc, ascopore: or, avicularium ; pe, peristome; pi, peristomie; pic, peristomiee; tr, 



tremoc.vst ; ,~. zooeeium. 



12. Longitudinal thin section through the middle of a zoarium, X 20. The chain of 



median fusiform areas results from the alternation of the zooecia seen in per- 

 spective. 

 Vicksburgian ("Chimney rock" of JIarianna limestone) : One mile north of Monroe- 

 ville, Alabama. 

 Cat. Xo. 64263, U.S.N.M. 

 Fig. 13. SchizomaveUa longirostris, new species (p. 358). 



Surface of the bilamellar zoarium, X 20, with ovicelled zooecia and prominent 



median avicularium. 

 Vicksburgian (Red Bluff member) : Red BUifiC, Waj'ne County, Mississippi. 

 Cat. Xo. 64264, U.S.N.M. 

 Fig. 14. Thalamoporella prima, new species (p. 269). 



The type-specimen, X 20, a fragment of a bilamellar zoarium. 

 Uppermost Vicksburgian (Byram marl) : Leaf River, Smith County, Mississippi. 

 Cat. Xo. &4265, U.S.N.M. 

 Figs. 15, 16. Tryposfer/a rcniista Xorman, 1864 (p. 380). 



15 An exam])le, X 20, with the frontal removed by abrasion to show the dietellae around 

 the zooecia but none around the zooeciules. 



16. Surface of the incrusting zoarium, X 20, of a specimen identified with this recent 



species. 

 Vicksburgian (Byram marl) : Byram, Mississippi. 

 Cat. No. (>4266, U.S.N.M. 

 Figs. 17, 18. HippomeneUa capititnortis, new species (p. 384). 



17. Ovicelled zooecia. X 20, showing the characteristic death's head appearance due to 



the perforations in the ovicell. 

 Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles south of Jackson, 

 Alabama. 



Cat. No. 64267, U.S.N.M. 

 IS. Surface of the bilamellar zoarium, X 20. 



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

 River, Escambia County, Alabama. 

 Cat. No. 64268, U.S.N.M. 

 Figs. 19-21. HtephanoseUa cntnmoslnma Reuss, 1847 (p. 345 I. 



19. Portion of the incrusting zoarium. X 20. in which the zooecia have small scattered 



areolae and the accompanying granulations. 



20. Zooecia without ovicell, X 20. The oral avicularium is small and without pivot. 



The ancestrula is an ordinary zooeeium; the avicularia are without pivot. 



21. Ovicelled zooecia. X 20. The avicularia are frontal instead of or.-il, and olocyst forms 



the zooecial frontal and the ovicells are mai'ked by a crownlike border. The 

 avicularia have a pivot. 

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

 River, Escambia County. Alabama. 

 Cat. No. 64269. U.S.N.M. 

 Fig. 22. StephmioaclJn pnifiporn. new species (\i. 344). 



Surface of the incrusting zoarium. X 20, showing the small dimensions. 

 Vicksburgian ("Chimney rock" of Marianna limestone > : Three miles southeast of 

 Vosburg, Jasper Couulv, Mississippi. 

 Cat. No. 64270, U.S.N.M. 

 86 



