I'l.ATE 4. 



Kk;. 1. VnlhiiKjid sHiiald, lu'w siitrii's ( |i. 1-".;;). 



Siirt'iK-e (if tlie inciiisthiic Zdnriuui, X UO. illustratiui; csiiccially tlir iiuiiiciniis lariJit; 



iuterzuut'ciMl a\iculari;i. 

 MUUvayan (Clayton limestone 1 : liniiulidgL', Ahiliaiiia. 

 Cat. Xo. Ga7!t5, U.S.X.M. 

 Fics. 2, 3. Aiiii>ltilil('sliiiin iinidKctKiii, new spet-u-.s (p. 1.")!)). 



L'. The inei'ustin.i; zoarinni, X lid. sliowini;; length ot zooccia. 



Mulwayan (Clayton liinestcnie i : 1 mile west of Fort Caines. (;cor;;ia. 

 Cat. Xo. (vITIH;. U.S..\..M. 

 3. A zoarinni, X I'll, exhiliitini;' .a sli.:;litl.v different aspect of the zoocc-ia. 

 Midwayan (Clayton linirstono) : LnveiMie, Crenshaw Comity, Alalia'iii.-i. 

 Cat. Xo. 037U7, U..S.X.M. 

 FiCi. 4. I'diHiilKiHotiifi shiaiii, new species (p. liUi. 



Snrface of the iuernstinir zoarinm, X 20. with lioth ovicelled ami nono\ icelled zooecia. 

 Midwavan (Clayton limestone) : lirimdidi^e, Alahania. 

 Cat. Xo. (53708, U.S.X.M. 

 FiiiS. 5-il. StdmeiiorclUi iiiiiliraiinnica, new species (p. 1(50). 



."i. The lower portion of the free, bilamellar, claviform zoarium. X 20. willi radiiMil.ar 



zooecia. 

 (5. Tile upiier, broader portion of the zoarium, X 20. 

 7. A fra.sjnient. X 20, with radiiailar zooecia and jirominent avicularia. 

 S. A broad zoarium, X 20. exhibitin.c the normal .-iiiiiearance of the zooecia and avicularia. 

 9. An example, X 20, with stron.dy develo|ieit radicular zooecia. 



Midwayan (Clayton limestone) : Mabelvalc. near I,ittle liock. Arkansas. 

 Cat. Xo. 63700, U.S.X.M. 

 Figs. 10-1."i. Ncllin iiiiiJiniininicn, new .species (p. 107K 



10-11. Three fraj-'ments of the articulated zoarium, X 20, showing two aspects of the lii-oail 

 zooecia. 



12. An example, X 20, illu.strating the nari'ow zoooci;;. 



13. A fragment, X 20, with a radicular pore at the base of certain opesia, 



14. Knd view of .a segment, X 20, exhibiting its ((uadrangul.ar form .and the b.is.ai pore. 

 Midwavan (Clayton limestone! : Luverne, CrensU.iw (_'oimty. Alaliama. 



Cat. Xo. 63S00, U.S.N.M. 



15. Another fragment. X 2.5. 



Midwayan (Clayton limestone! : Mabelvale. near Little Itock. Arkansas. 

 Cat. Xo. 03801, U.S.X.M. 

 Flos. 10-10. ^iniWiMjra iiti(liva!ianic<i. new species (p. 22.")!. 



16. .V fi'agnient. X 20, showing the liase of the c,yliuclrieal .segment. 



17. Pmtion of a segment, X 20. illustrating the u.sual asiiect of the zooecia. 



IS. An examiile, X 20. The zooecium in the centei' with small narrow opesium is probalily 



an on.vchocellarium. 

 10. A fragment, X 20, with well develoiied mui'al rims. 



Jlidwavan (Cla.vton limestonei : Mabelv.ale, near Little Itock, Arkansas. 

 Cat. Xo. (53S02, U.S.X.M. 

 Figs. 2(V22. ilicroitova roihici-ii Esper, 1701 (p. 23.5). 



20. The incrtisting zoarinni, X 2i), witli three ovicelled zooecia. The o)iesiules are closed 



by fossiljz.ation. 

 Upper .J.acksonian (Ocala limestone! : M miles above Bainbridge, (ieorgia. 

 Cat. Xo. 63X03, U.S.X.M. 



21. Portion of a zoarium. X 20, showing region about the ancestrula. The opesiules are 



quite visible. 



22. The normal aspiect of the zooecia. X 20. 



Middle Jacksonian (Castle Ilayne limestone) : Wilmington. Xorth Carolina. 

 Cat. Xo. 0.3804, U.S.X.AI. 

 Fi(i. 23. ilicropora Diiiiiiticrllii. new sjieeies (p. 2.37). 



The inerusting type-specimen, X 20, exhiliitiiig the extreme minuteness of the zooecia. 

 Midwavan (Clayton limestone) : 1 mile west of I'ort (iaines, (ieorgla. 

 Cat. Xo. 0.3.S0.5, U.S.X.M. 

 FifiS. 24. 2.5. }feiiihr(i)iii)firell(i crdnnicrjlliK. new species (ji. 280). 



24. Fr.agmeiit of the free, bilani(>llar zoarium. X 20. The thick ]iei'istome is .a prominent 



feature. 



25. An example, X 20, bearing ovicelled zooecia. 



Midwavan (Clayton limestone) : Mabelvale, near Little Kock. Arkansas. 

 Cat. Xo. 0.3800, U.S.X.M. 



5 



