Plate 12. 
Figs. 1, 2. Membrendoecium parvicapitalum, new species, (p. 36.) 
1. The incrusting type specimen X 20, with ancestrular, normal, ovicelled and regenerated 
zooecia. 
Miocene (Choctawhatchee marl): Jackson Bluff, Ocklocknee River, 25 miles southwest of Talla¬ 
hassee, Florida. 
2. An Early Miocene specimen, X 20, referred to this species. 
Lower Miocene (Bowden marl): Bowden, Jamaica. 
Fig. 3. Callopora parviroslris, new species, (p. 41.) 
A portion of the type specimen, X 20, with normal and ovicelled zooecia, exhibiting the small, 
triangular, suberect avicularium. 
Miocene (Calvert formation): 1 mile south of Parkers Creek, Calvert County, Maryland. 
Figs. 4-5. Alderina cesticella, new species, (p. 39.) 
4. Ancestrular region of the incrusting zoarium, X 20, showing regenerated, calcified and ovi¬ 
celled zooecia. The ovicells have a prominent collar. 
5. Another view of the same zoarium, X 20, exhibiting regenerated zooecia and numerous salient 
spines on the zooecial walls. 
Miocene (Duplin marl): Natural Well, 2 miles southwest Magnolia, Duplin County, North 
Carolina. 
Fig. 6. Ogivalina parvula Ulrich and Bassler, 1904. (p. 37.) 
The incrusting type specimen X 20. A small cryptocyst and often a small convex gvmnocyst 
are present. 
Miocene (Calvert formation): Reeds, Maryland. 
Fig. 7. Membraniporidra parva, new species, (p. 39.) 
The imperfect type specimen, X 20, with two ovicelled zooecia. 
Miocene (Choctawhatchee marl): Jackson Bluff, Ocklocknee River, 25 miles southwest of Talla¬ 
hassee, Florida. 
Figs, 8, 9. Dakaria torquata D’Orbigny, i839. (p. 98.) 
8. Portion of the incrusting zoarium, X 20, with ovicelled zooecia. 
9. Normal zooecia, X 20, illustrating the characteristic broad sinus. 
Miocene (Yorktown formation): 3 miles southwest of Petersburg, Virginia. 
Fig. 10. Hippodiplosia bigibbera, new species, (p. 131.) 
The incrusting zoarium. X 20, showing the aperture deformed by two frontal gibbosities. 
Miocene (Yorktown formation): 3 miles southwest of Petersburg, Virginia. 
Fig. 11. Callopora lanceolata, new species, (p. 41.) 
The incrusting type specimen, X 20, showing ovicelled and normal zooecia, diatellae and the 
large lanceolate avicularia. 
Miocene (Yorktown formation): 3 miles southwest of Petersburg. Virginia. 
Fig. 12. Callopora dumerilii Savigny-Audouin, 1826. (See also pi. 1, fig. 2; pi. 2, fig. 23.) (p. 40.) 
Photograph of a specimen, X 20, referred to this species. 
Lower Miocene (Chipola marl): Chipola River, Calhoun County, Florida. 
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