Plate 135. 



Fics. 1-15. Cciitronca iiiicropord Reuss. 38(59 (p. 7G1). 

 1. Variou.s views of the zoariura, natural .size. 

 2, 3. An aggregated zoarium, natural size and X 3. 



4. Basal side of an aggregated zoariura, X 3. The basal laiiK-lIa is concentrically 



striated. 



5. Celluliferous face of a discoidal zoarium. X t!. The fascicles are irregularly arranged. 



6. Lower face of another simple zoariiiui, X 6. 



7. Side view of two superposed subcolonies, X 6. 



8. Top and basal \iews of two young specimens, X 12, \\ith marginal subcolonies. 



9. Axis of union of basal lamellae of two ad.iacent subcolonies, X 12. The pores are 



the orifices of the incomplete tubes. 



10. Ovicelled specimen, X 12. 



11. Zoarium with large marginal lamella, X 12, supporting very young incompletely calci- 



fied zooecia. 



12. Zoarium with ijluriserial fascicles, X 12. 



13. Zoarium with small marginal subcolonies, X 12. 



14. An ovicelled zoarium, X 12. 



l.j. :\Iedian thin section, X 12, showing closed zooecia (c. c.) in the center and the begin- 

 nhig of a snlicolony {s. c.) to the left. 

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

 Cat. No. 65343, T.S.N.M. 

 Figs. 16-20. Idinniieii arciuitn, new species (p. 770). 



10. Specimens of the .short free zoarium. natural size. 

 17, 18. Celluliferous side of these specimens, X 12. 

 19, 20. Dorsal of tlie same examples, X 12, showing convex striations. 



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

 Cat. No. 6.5344, U.S.N.M. 

 Frcs. 21-2G. Idinonca sloani, new species (p. 770 1. 



21. Fragments of the free linear zoarium, natural size. 



22. Lateral view of an example, X 12. 



23, 24. Frontal side of another specimen, X 12, and a portion, X 25. 



25. Dorsal of a specimen, X 12, with a flat basal lamella. 



26. Another example, X 12, with a concave lamella bordered by a thick margin. 



Middle Jacksonian : Near Lenuds Ferry, South Carolina, and Wilmington, North 

 Carolina. 



Cat. Nos. 65480, 65345, U.S.N.M. 



136 



