Plate 98. 



Fjts. 1-10. Mctivralxlotos monilifcnim Milno-Edwnrds, 1830 (p. 533). 

 1 Restoration of the ramose zoarium. natural size. 



o Surface of the ordinary zooecia without avlcularia, X 20, bordered by ridges. 

 3 Another fragment, X 20, showing convex zooecia with lyrula and avicuhina. 

 4^ A branching fragment. X 20, exhibiting convex and marginated zooecia with and 

 without lyrula and avicularia. ,=„„„„h 



5 ^ branch, showing nine ovicelled zooecia, X 20. The large orifice of the oMcelled 



zooecia is in contrast with the small aperture of the ordinary ones. 



6 Interior of the frontal of the ordinary zooecia, X 20. The areolae are quite visible. 



7 Longitudinal section, X 20, through the ordinary zooecia. 



S. Tangential thin section through the frontal, X 25. The sinus and lyrula of the 



aperture and the areolae are plainly visible. 

 9 rortion of the same section, X 100, showing the microscopic structure m more detail. 



10. Sketch of a longitudinal section, X 20 cutting an ovicelled zooecium. 



an, apertura; ov, ovicell ; ?, zooecium. 

 Vicksburgian ("Chimney rock" of Marianna limestone) ; One mile north of Monioe- 



ville, Alabama. 



Oat. No. 64316, U.S.N.M. 

 Figs 11-15 Mctrarahdotos grandc, new species (p. 537). 



11. A restoration of the free dichotomously branching zoarium, natural size. 



12. Ordinary zooecia, X 20. Oral avlcularia are absent. 



13. Ovicelled zooecia, X 20. . , . , ^, „,i„^ 



14. Interior of the ordinary zooecia. X 20, showing a thick frontal m which the aieolae 



are not visible. . , 



15. Vertical section, X 20, exhibiting one of the partitioned tuberosities serving perhaps 



in the hvdrostatic system. 

 Vicksburgian (Marianna limestone): Three miles southeast of \osburg, Jasper 



County, Mississippi. 



Cat. No. 64317, U.S.N.M. 



99 



