Plate 21. 
Figs. 1-4. Cyclocolposa tenuiparietis, new species, (p. 136.) 
1. The incrusting zoarium, X 20, with some of the zooecia hearing a round avicularium. The 
thinness of the zooecial walls may be noted. 
2. Ovicelled zooecia, X 20, showing the ovicell deeply imbedded in the distal zooecium. 
3. Zooecia, X 20, exhibiting regular arrangement, the two rows of areolae and the granulated 
pleurocyst. 
4. Interior of the zooecia, X 20, illustrating the condyles on each side of the apertura. 
Miocene (Duplin marl): Harvey’s Mills, Leon County, Florida. 
Figs. 5-9, Cycloperiella rubra, new species, (p. 137.) 
5. Surface of an incrusting lamella, X 20, with several ovicelled zooecia, showing that the ovicell 
entirely covers the apertura. 
6. Normal zooecia, X 20. 
7. Interior of the zooecia, X 20, illustrating the two lateral condyles on which the operculum 
oscillates. 
Miocene (Duplin marl): Wilmington, North Carolina. 
8. Zooecia, X 20, preserving a frontal gibbosity. 
Miocene (Duplin marl): 8 miles east of Snow Hill, North Carolina. 
9. A Pliocene example of this species, X 20; the zooecia are slightly less regular than in the 
Miocene form. 
Pliocene (Waccamaw marl): Waccamaw River, Horry County, South Carolina. 
Figs. 10-14. Aimulosia aculeata, new species, (p. 139.) 
10. The incrusting zoarium with ovicelled zooecia, X 20. 
Miocene (Duplin marl): Harvey’s Mills, Leon County, Florida. 
11. The ancestrula and surrounding zooecia, X 20. The first zooecium is an avicularium while 
the other four zooecia are normal. 
Miocene (Duplin marl): Muldrow’s Mills, South Carolina. 
12. A very irregular incrusting zoarium, X 20. 
Pliocene (Waccamaw marl): Waccamaw River, Horry County, South Carolina. 
13. Zoarium with ovicelled zooecia, X 20. The orifice of the ovicell is distinct from the apertura. 
14. Broad marginal zooecia, X 20, without ovicell. 
Miocene (Duplin marl): Wilmington, North Carolina. 
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