Pl.uf. 86. 



Figs 1-6. Schizomarella arhorea. new siwoies (p. 3.">7). 



1 Fragments of the roaiike zoariuiu. luitural size. 



2'. Fonr-sided zoarium, X 20, with .-ectangulnr si.les and small aviculana, 



3. Profile view of small fragment, X 20. 



4 A rounded fragment, X 20. with small avicularia. ,,..., 



t Inother roun.rod znariun,. X 20. exhibiting variations in length of the elUpl^'al 



G. P.rncWng'rai-ium. X 20, with the salient pnnctate ovicell preserved on the upper- 

 most zooecium. •■ , ^ ., „»,, ,,f M,„,vno 

 Vicksburgian ("Chimney rock" of ilarianna limestone) : One mile north of Mouioe 



ville, Alabama. 



Cat. No. 64271. U.S.N.M. 

 Figs. 7-1.5. HiOpoporcUa perforntd. new siiecies (p. 3TS). 



7 The free, orbicular zoarium, natural size. ^. , «, , 



8 Lower face of zoarium, X 20, showing perforations, probably for radical fibe.s. 

 o' Ordin-irv zooecia, X 20, with areolae frequently occurring above the ai>erture. 



10. Tangential thin section, X 20, showing olocystal elements of frontal wall radmtiag 



from the aperture toward the areolae. 



11. Zooecia at the center of the zoarial surface, X 20. These zooeca are erect and 



have large auricuhited vibracula. 



12. Ovicelled zooecia, X 20. The ovicell is formed of three closely arranged calcareous 



13. ZoaHnm, X 20, showing hydrostatic tuberosities accompanying the perforations of 



VicksbTgL ("Chimney rock" of Marianna limestone) : One mile north of Monroe- 

 ville, Alabama. 



Cat. No. 04272, U.S.N.M. 

 Firs 14-10 Hippowenclln ro.«/»?(r/(i. new species fp.385). 



■ ■ 14 Group of the more or less cylindrical free zoaria, natural size. 



in Zoarium X 20, in which the interareolar costules are little developed. 



16 Ovicelled zooecia, X 20. showing the two perforations and the costules on the ovicell. 



17 Ovicelled zooecia, X 20, with transverse avicularia. , , , ^ 



18 Zoirium X "0 in which the interareolar costules are strongly developed. 

 19' Portion of zoarium, X 20. with more than the usual six rows of zooe-ia. 



vSsburgian ("Chimney rock" of Marianna limestone) : One mile north of Monroe- 

 ville, Alabama. 



Cat. No. 64273, U.S.N.M. 

 T?ir« 00-04 HmwrneneUa tramversoni. new species (p. 3S8). 



'S Fragment of the unilamellar zoarium, X 20, illustrating the saliert proximal mucro 



of the aperture and the transverse avicularia. 

 91 Ovicelled zooecia, X 20, showing resemblances to HippomeneUa costulata. 

 22. Zooecia about the nncestrnla, >: 20, The latter is the small oval zooecium at the 



center of the figure. , i, . ,_ ■ 



00 Basal side of a zoarium. X 20. with some zooecia broken so as to show the interior. 

 Z' Zoarium with a broad salient mucro on some of the zooecia X 20. 



^°cksburgian (Marianna limestone) : West bank of Conecuh River Kscambin County, 

 Alabama, and Murder Creek, east of Castlebury, Conecuh County. Al.nbama (fig. 23). 

 Cat. Nos. 64274, 64275, U.S.N.M. 



