Plate 75. 



Figs. 1-3. Scliisniopora iniib'niatu. new species (r. 000). 



1. The fragmentary type-specimen of this discoidal species, natural size. 



2. The central zooecia, X 20. The erect superficial zooecia. with smooth frontal and 



strong umbo are shown. 



3. Another view of the same zoarium, X 20, showing oriented marginal zooecia at the 



bottom. The upper part of the figure shows the usual superficial zooecia and 

 several incomplete zooecia. 

 Upper Jacksonian (Ocala limestone) : Alachua, Florida. 

 Cat. No. 64211, TJ.S.N.M. 

 Figs. 4-6. Schisniopora orbicularis, new species (]). 600). 



4. The unilamellar zoarium, natural size. 



5. C«lluliferous side of the type, X 20. The superficial zooecia are oriented. 



6. Basal side of the same, X 20. 



Middle Jacksonian: One-half mile snuthe.Tst of Georgia Kaolin Co.'s mine. Twiggs 

 County, Georgia. 



Cat. No. 64212, U.S.N.M. 

 Figs. 7-15. Hchismopora glnbosa, new species (p. 598). 



7-10. Top and side views of the globose zoarium, natural size. 



11. Superficial zooecia. X 20. The frontal avicularium is represented by a large cicatrix. 



The apertura has a broad, triangular rimule. 



12. Another aspect of the surface, X 20. Several incomplete zooecia are present. 



13. Transverse thin section, X 10. 



14. A portion of the same section. X 100. The olocystal nature of the walls is illustrated. 



15. Another part of this section, X 100. 



Lower Jacksonian (Moodys marl) : Jackson, Mississippi. 

 Cat. No. 64213, U.S.N.M. 

 Figs. 16-20. HoloporeUa altirostris, new species (p. 606 i. 



16. Two small masses of the incrusting zoarium, natural size. 



17. Surface, X 20, showing erect superficial zooecia with large oral avicularium. Several 



ovicelled zooecia are present. 



18. Edge of a zoarium, X 20. A prominent tongue hides the zooeeial apertures. 

 Jliddle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina 



Cat. No. 64214, U.S.N.M. 



19. An aspect of the species, X 20. in which the apertura is very deep. Several incom- 



plete zooecia are developed. 



20. Ovicelled zooecia, X 20. The ovicells and the large frontal avicularia are frequently 



broken. 

 Middle Jacksonian : Rich Hill. Crawford County, Georgia. 

 Cat. No. 64215, U.S.N.M. 

 76 



