ri.ATE 20. 



Fic.s. 1-a Coiioinuiii hiwcJI'i.'iiiiii. m^w species (p. 02). 



1,2. Two of tlie uiululatins zoariiil fronds, natural size. 

 sU. Two views. X 20, of deformeil zooeeia sliowing variations in form. 

 5 Surface of zoaria. X 10, exliibitins origin of an adaitional lamella. 



6. Young zooecia, X 20, with thin mural rim and the distal septula (in hlack) and two 



distal impressions of oac-li zooecium (in gray) visible. 



7. Dorsal of a zooeeial la.ver, X 20. 



8. Normal zooeeia, X 20, with n.ura! rim enlarL-e,! at the base an.l interope.sial cavities 



plaiulv visible. 

 0. Tangential thin section of a zo,.eciuni, X 100, showing stru.-tnre an.l occurrence 



of a septula. 

 Lower Jacksonian (Moodys marl): Jackson. Jlississippi. 

 Cat. Xo. 0.'!ST2, I'.S.X.M. 

 Fics 10-10 Coiioixiiiii iirhdirsrcns, new species (p. 03). 



1(1 Five zoaria, natural size showing the free, irregular, branched form of growlli. 



11 Zooeeial surface X 2(1. The mural rims are sometimes separated by a small furrow. 



12^ A superimposed z„ari,-il layer, X 20. exliibiting same methods of origin as in ro»o,,rHm 



13 Zooeeia X 20, with interopesial cavities which souietinies resemble small avicularia. 



14. Inner face of zoarium showing dorsal side of zooecia, X 20. P^ach has a distal 



collar. . , 



15. Longitudinal section of one side of zoarium. X 10. exhibiting (he many sui.enmposed 



layers. . . 



16. Tangential thin section. X 100, exhibiting wall structure. The interopesial cavities 



have special walls. 

 Lower Jack.sonian (Moodys marl): .Jackson. Jlississiiiin. 



Cat. No. C.3S73, U.S.N.JI. ^^ 



