Plate 61. 



Figs. 1^. Smittina orhinicularia, uew species (p. 469). 



1. Surface of the unilamellar zoariuni, X 20, exliibitiug ordinary zooecia with their 

 orbicular avicularia. The pivot of the avicularia is quite visible. 



2. View of the interior. X 20, where the l.vrula is visible. 



3. Ovicelled zooecia, X 20. 



4. Another specimen, X 20. A single ovicelled zooeciuni (broken) is present. The 



avicuhirinm shows two or more i»rforations. 

 Middle JacUsoniau (Castle Hayue limestone) : \Yilmington, North Carolina. 

 Cat. No. 64134, U.S.N.M. 

 Figs. 5-8. Smittina piincturatn, new species (p. 464). 



5. The iucrusting zoarium, X 20, exhibiting the ancestrula and surrounding zooeciM. 



6. Interior of zooecia, X 20. 



7. Large zooecia, X 20, with well preservtil median avicularia. The pleurocyst is 



finely porous. 



8. A zoarium, X 6, the original of figure 5. 



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

 Cat. No. 64135, U.S.N.M. 

 Figs. 9-13. Plagiosmittia regnlaris Canu and Bassler, 1017 (p. 472). 



9. Four fragments of the flat bilamellar zoarium, natural size. 



10. Ovicelled zooecia X 20. 



11. Ordinary zooecia, X 20, separated by a thread. The transverse arrangement of the 



zooecia, the tremocyst and the lateral position of the avicularium are clearly 

 indicated. 



12. Ordinary and ovicelled zooecia, X 20, separated by a furrow and showing a salient 



peristome and the avicularium quite clearly. 



13. Tangential thin section through the frontal, X 20, illustrating structure of the 



ti'emocyst. 

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

 Cat. No. 62600, U.S.N.M. 

 Figs. 14-18. Plagiosmittia poi-elJoides, new species (p. 472). 



14. A nearly complete example of the narrow bilamellar zoarium. natural size (restora- 



tion). 



15. Surface of a branch, X 20, showing the small micrometric dimensions and the 



median position of the avicularium. 

 IG. Interior of zooecia, X 20. The ovieell, shape of the apertura, and the avicularium 



are shown. 

 17. Ovicelled zooecia, X 20. As in other species of Plagiosmittia, the ovicell is formed 



of a porous area surrounded by a narrow, smooth collar. 

 IS. Tangential thin section, through several zooecia. X 100. The tremocystal nature of 



the frontal is evident. 

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

 Cat. No. 64136, U.S.N.M. 

 G2 



