Plate 43. 



Fius. 1-7. MvtriicijIiioKti idhiistn ('.■iiiu .-iimI liiissler, 1!_I17 (p. 306). 



1. Three fragments of tUe bifolinte zoariurj, natural .size. 



2. Surface of au example, X 20, witli some broad zooecia showiug costules radially 



arranged. The infrequent avicularia with pivot are present on this specimen. 



3. Anotlier specimen, X 20. with numerous ovicelled zooecia. Tiie avicularia are 



entirely absent. 



4. Tangential thin section through the walls of a zooeciuni, XliM). The wall is com- 



posed of scattered olocystal elements, and the avicularia represented by the two 

 smaller openings appear to be interzooeeial. 



5. Sketch of a longitudinal section through an ovicelled zooeciuni. The ovicell is seen 



occupying a part of the distal zooecium. 

 ') 6. Edge view of a zoarium, showing four or tive lateral septulae to a zooecium. 

 7. Drawing of the interior of a zooecium, illustraiing the occun-ence of the ovicell in 

 the distal zooecia. 

 Middle Jacksonian : Lenuds Ferry, South Carolina. 

 Cat. No. 62586, U.S.N.M. 

 Fig. S. Ciibicnilocciiim tcniiictistiiliititiii Cauu and Bassler, 1!)17 (p. 310), 



View of the incrusting t.vpe-specimen, X 20, exhibiting the endozooeeial ovicell and 

 the numerous thin costules, separated b,v very small lacunae, and without lumen 

 Iiores. 

 Middle Jacksonian (Castle Ilayne limestone) : Wilmington, North Carolina, 

 Cat. No. 6258S, U,S.N.M. 

 Fiu. 0. Fir/ularia crassicostulata, new species (p. 316). 



The Incrusting type-specimen. X 20. The hyperstomial ovicell and the larger size 



of the costules separate this from the preceding si)ecies. 

 Upper Jacksonian (Ocala limestone) : Chipola River ,east of JIarianna, Florida. 

 Cat, No. 64036, U.S.N.M, 

 FiCiS. 10-13. AcantUiicelln eriiitirca Cann and Bassler, l'.il7 (p. 309). 



10. A small fragment, X 20, with traces of tlie ovicell. Large lacunae separate the 



costules in this specimen. 



11. Another zoarium, X 20, with one ovicelled zooeciuni. 



12. View of a tangential section, X 40, Illustrating the occurrence of a lumen and large 



lumen pores, 



13. The incrusting zoarium, X 20, with zooecia lacking the ovieells. 



Middle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina. 

 Cat, No. 62587, U.S.N.M. 

 Fio. 14. Corhulipora enlltirif:. new species (p. 308). 



A portion of the free, quadriserial, biftircated zoarium, X 20, showing the occurrence 

 of a collar about some of the zooeeial apertures, formed by the union of the first 

 three pairs of costules. 

 Middle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina. 

 Cat. No. 64035, U.S.N.M. 

 Figs. 15-18. GnstmpcUa nspcrnhi. now species (p. 3211. 



15. Three of the free cylindrical zoaria, natur.il size. 



16. Surface of an examjile. X 20, slmwing the large ascopore in the middle of the frontal 



and the small areolae. 



17. Another example, X 20, in which numerous small avicularia are developed on the 



peristome. 



18. Sketch of apertura, X 70. 



Middle Jacksonian (Castle Hayne limestone) : Wilmington, North C.-iroliua, 

 Cat. No. 64037, U.S.N.M. 

 Figs. 10-21. Beisscliiia triilln. new species (p. 324). 



19. The free, bifoliate zoarium, natural size. 



20. Surface. X 20, showing the large tubular tremoiiores and the stil! larger ascopore. 



21. Vertical section, X 20. 



Lower Jacksonian (Moodys marl): .Tackson. Mississippi. 

 Cat. No. 64038, U.S.N.M. 

 44 



