Plate 99. 



Figs. 1-10. AdeoneUopsis galeata, new species (p. 568). 



1. Three fragmentary zoaria, natural size, including one almost complete example. 



2. Young zooecia, X 20, exhibiting the specific characters. 



3. Another zoarium, X 20, showing development of total area. Two, and sometimes 



three, jjores may be noted on the distal thickening of the peristome. 



4. A more advanced stage, X 20, with the median avicularia more elongated and im- 



bedded. 



5. Surface of a zoarium, X 20, in which the total area includes the apertura, cribriform 



area, and median aviculariuni. 



6. Surface of old zooecia near the base of a frond, X 20, where the distal thicliening of 



the peristome disappears. 



7. Surface of an old zoarium, X 20, in which the adventitious avicularia are still visible. 

 8, 9. Tangential thin section, X 25. and a small portion, X 100, exhibiting the large 



pleurocystal elements. 



10. Sketch of longitudinal section, X 50, illustrating structure. 



ap. apertura; av. f, frontal aviculariuni; av. 1. lateral aviculariuni; ?. p. perforated 



lamina; p, pore; pic, peristomice; p. li. false hypostege; ;■, zooecium. 

 Vicksburgian (Byram marl) : Byram, Mississippi. 

 Cat. No. 64318, IJ.S.N.M. 

 Figs. 11-lS. Adeonellopsis graiuUs, new species (p. 568). 



11. Four zoaria. natural size, aimost complete. 



12. Surface of zoarium, X 20, with gonoecia showing the cribriform area and the 



peristomial aviculariuni well developed. 



13. Broad zoarium, X 20, exhibiting numerous areolae, frontal avicularia and the 



peristomial avicularia deeply imbedded. 



14. Toung zooecia, X 20, with the ascopore visible below the peristomial aviculariuni. 



15. Surface of young zoarium, X 20. with prominent peristomial avicularia. 



16. Thin transverse section, X 20. The zooecia are thick and the pleurocystal elements 



are grouped transversally. 

 17, 18. Tangential thin section through the frontal, X 20, and a portion, X 100. The 

 relations of the apertura, peristomial avieularium, ascopore, and areolae are 

 illustrated. 

 Vicksburgian ("Chimney rock" of Marianna limestone) : One mile north of Jlonroe- 

 ville, Alabama. 



Cat. No. 04319, U.S.N.M. 

 100 



