Plate 33. 



Figs. 1-3. Rcctoninhnfi Jin hilanii Ilaiin. new species (\t. '210). 



1. The free, bilamellar zoariiiui, X 20, showing the general symineti-y of the zooecia 

 and onychocellaria. 

 ~ -2; A narrow zoaritim, X 20, With long zooecia. 



3. An exampJe, X 20, with broader zooecia and more distinct polyjiidian convexity. 

 I'plier .Jacksonian (Ocahi limestone) : West bank of Sepnlga River, Escambia County, 



Alabama. 



Cat. No. G3966, TJ.S.N.M. 

 Figs. -i-Ct, Rectoniichocelhi toiuia. now species (p. 211 1. 



4. The incrusting zoarinni, X 20. with one ovicelled zooecium (at the top of the figure). 

 Jacksonian (Zeuglodou zone) : Cocoa post ofiBce, Choctaw County, South Carolina. 



Cat. No. 63967, TJ.S.N.M. 



5. The surface of zoarium, X 20, showing zooecia without a polypidian convexity and 



onychocellaria with the point of the opesium directed to the top. The mural rim 

 surrounding the zooecia is very thin. 



6. Zooecia. X 20, in the region of the ancesirula. 



Lower Jacksonian (Moiidys marl) : Jackson. Mississiiipi. 

 Cat. No. 63968, U.S.N.JI. 

 Figs. 7,8. ReclonychoccUa elliiiti<ii. now species (p. 212). 



7. Surface of the incrusting zoarium. X 20, showing a calcified zooecium. 

 Upper Jacksonian (Ocala limestone) : Bainbridge, Georgia. 



Cat. No. 63969, TLS.N.M. 



8. Another example, X 20, illustrating the characters of the species, especially the 



fusion of the distal canal of the onychocellarium with the eryptocyst of the distal 

 zooecium. 

 Upper Jacksonian (Ocala limestone) : Chipnhi River, east of Marianna, Florida. 

 Cat. No. 68970, T'.S.N.M. 

 Figs. 9-13. Rectonychorella seiiiiliiini. new species (p. 21'n. 



9. Under side of the free unilamellar zoarium, X 20. e.xhibitiug irregular, convex zooecia. 



10. \'iew of the interior of the frontal, X 20. The great length of the oiiychocellarian 



opesia is shown. 



11. Surface iif zoarium, X 2<i. The large oposium nf the onychocellnriuni ( o» ), charac- 



terizing the species, is visible. 



12. Tangential thin section of the zooecial walls. X 20. showing their vacuolar olocyst 



structure. The large size of the onychocellaria is also evident. 



13. Another zoariain, X 20, exhibiting zoaria with wider and also narrow opesia, due to 



different stages in calcification. 

 Jliddle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina. 

 Cat. No. 63971. U.S.N.M. 

 34 



