Plate 20. 



Figs. LL'. Mcniliniiiipuridid (iccidiKinisii. nrw si;ecies (p. i:-!::!). 



1. SurfiK'e o( the iiicrustii.;;- /.(Kiriuiii. X "Jd, .■xliiliitins tlie elonsatwl z. -i;!, williuut 



ovicells. 

 Lower Jjicksouiaii (Mocxl.vs iiiiirU : Jni-ksmi. Mississiiiiii. 

 ('Mf. No. 63902, T'.S.N.M. 



2. Z(M,<"cia, X 20. with ovicells. Tlie biM,la'U ovirells show the finely porous w;Uls. 



Several calcified zooeeia are present. 

 Middle Jacksonian : Kicli Hill, Crawford Cdnnty. (Jeorgia. 

 Cat. No. 03903, U.S.N.M. 

 Figs 3-5 Mciiihniuiiuiri'lra UUicclUi. ww sv^net^ {\).V.'r,\. 



3. Tlie incrnsting zoarimn, X 20. Tlie zooeeia Have a convex gymnocyst and several 



of tliein show total regeneration. 



4. Another zoarium, X 20, with minicrons cases of regeneration, zri represents a 



regenerated zooeciiiui replacing a normal one inversely. 



5. Surface, X 20, illustrating a case of regenerati.ni in which an ovicelled zooeciniu 



succeeds .a normal one {zro). 

 Middle Jacksonian (Castle Ilayne limestone »: Wilmington. Nc.rth Carolina. 

 Cat. No. 03904, F.S.N.M. 

 Fics. 0-13. Mciiihroiiiimiidni iii,rn;tii Ciinn and P.:issler. 1917 (p. 1351. 



6. Four fragments of the free, liifoliate zoarium. natural size. 



7. Surface of zooeeia, X 20, exbihiting both ehmgate and dw.-irfed zooeeia, 



8. Another zoarium, X 20, with the usual characters of the species. 

 9 10 Two fragments, X 20, showing variations in the width of the zooeeia, 



\l. A zoarium with ovicelled zooeeia, X 20, Tlie separating furr..w is replace.l in some 

 case bv a thread like projection, 



12, Sketch of a tangential section through a zone,-inm, X 20, si, hiteral septula : st. ter- 



minal se|itula: n: zooecial w.ill ; c. zooecium, 



13, Tangential thin section through the mural rim and the gymnoeyst, X 1(H>. 



' Middle Jacksonian (Castle Ilayne limestone): Wilmington, Nurlh Carolina, 

 Cat. No, 6257S, r.S,N,M, 



