Plate 87. 



Figs. 1-4. BiiipoinriK lla iiinnjcns, now species (p. 3SS). 



1. Surface of the uuilamellar zoarium. X 20, illustrating cliaracters of the ordinary 



zooecia. 



2. Basal side of zooecia, X 20, exhibiting the hydrostatic tuberosities. 



3. Another zoarium, X 20, with some ovicel.IecT zooecia. 



4. Several zooecia, X 20 showing the frontal to be formed of a thin pleurocyst con- 



taining the areolae and of an underlying smooth olocyst. 

 Vicksburgian f" Chimney rock" of Marianna limestone) : One mile north of Monroe- 

 ville, Alabama. 



Cat. No. 64276, U.SN.M. 

 Figs. 5, 6. Hiiqiodiiihixiti haccata. new species (p. 3!>7t. 



5. Surface of a zoarium, X 20. incrusting a shell. The short zooecia, small avicularium 



and pearl like tuberosities of the frontal are characteristic features. 



6. Ovicelled zooecia, X 20. The tremopores are more visible in this specimen. 

 Vicksburgian (Byram marl) : Byram. Mississippi. 



Cat. No. 64277, U.S.N.M. * 



Figs. 7-9. Hippodiplosia mapniporom. new species (p. 306 ». 



7. Young zooecia, X 20, with their peristome. 



Vicksburgian (Red BlufC member) : Seven and a half miles southeast of Bladen 

 Springs. Alabama. 

 Cat. No. 64278, U.S.N.M. 



8. Surface of the hollow, cylindrical zoarium. X 20. illustrating the normal characters 



of the zooecia. 



9. Zooecia, X 20, showing tremocyst detached from olocyst. 



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

 • bama. 



Cat. No. 64279, U.S.N.M. 

 Figs. 10-13. Hippodiplosia strangiilata, new species (p. 397). 



10. Surface of the unilamellar zoarium, X 20. showing narrow zooecia. 



11. Another example, X 20, with broad zooecia. 



12. A zoarium, X 20, in which the zooecia are bordered by a salient line. 

 Vicksburgian (Marianna limestone) : Murder Creek, east of Castlebury, Conecuh 



County, Alabama. 



Cat. No. 64280, U.S.N.M. 



13. Ovicelled zooecia, X 20. 



Vicksburgian (Byram marl) : Byram, Mississippi. 

 Cat. No. 64281, U.S.N.M. 

 Fig. 14. PeristomeJIa coccinca resupinata Manzoni, 1S7."> (p. 412). 



Portion of a free, erect zoarium, X 20. The elongated tubular part below the external 



aperture is well shown on this specimen. 

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

 ville, Alabama. 

 Cat. No. 64282, U.S.N.M. 

 Fig. 15. CycUcopora colum, new species (p. 425). 



The incrusting type-specimen, X 20. The large tremopores and the simple elliptical 

 avicularium arising from a lateral tremopore are shown. Several ovicelled zooecia 

 are present. 

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

 viUe, Alabama. 



Cat. No. 64283, U.S.N.M. 

 Figs. 16. 17. Peristmiiella erecta. new species (p. 413). 



16. A young example of this species, X 20. The interareolar costules and the longi- 



tudinally arranged avicularia are well shown. 



17. An older example. X 20, in which the zooecial frontal is covered by the granular 



deposit of the pleurocyst. 

 Vicksburgian (Marianna limestone) : Near Claiborne, Monroe County, Alabama. 

 Cat. No. 64284, U.S.N.M. 

 Fig. 18. Peristomella coccinca Abildgaard, (p. 400). 



Surface of the incrusting zoarium, X 20. The small mucro on the peristome, the 



spines and the two large oblique avicularia, are characterisMc of the species. 

 A'icksburgian (Glendon member of Marianna limestone) : West b.Tuk of Conecuh 

 River, Escambia County, Alabama. 

 Cat. No. 64285, U.S.N.M. 



