Plate 20. 



Fir.s. l-fi. Mirroporcllii riliata Linnaeus, 175!). (See also pi. 3(i, figs. 4, 5.1 (p. 119.) 



1. Incrusting portion of zoarium, X20, showing the typical zooecia. 



2. Bilamellar expansion of the same zoarium, X 20. The zooecia have large tremopores and no 

 granules. 



Miocene: Kuhns, Carteret County, North Carolina. 



3. Typical zooecia, X 20, with their frontal provided with granules and small tremopores. 

 Miocene (Choctawhatchee marli: .Jackson I'.luff, Cjcklocknee River, 25 miles southwest of Talla- 

 hassee, Florida. 



4. The original type specimen of MicroporeHa pracciiiala Ulrich and Bassler, 1004, X 2S, hither- 

 to distinguished on account of its large tremopores, 



5. Se\'eral zooecia of the same, further enlarged. 

 Miocene (Choptank formation i; .Jones Wharf, Maryland. 



(i. The type specimen of Micmporclla in'latii I'lrich and Bassler, 1904, now considered a synonym 

 of .1/. clllata. 



Miocene (Choptank formation!: .Jones Wharf. Maryland. 

 Fici.s. 7-11. ilkropnrcUa liifaliala I'lrich and Bassler, 1904. (p. 121.) 



7. Photograph of the Ijifoliate type specimen, X 20, with both ovicelled and unovicelled zooecia . 



8. A drawing of two ovicelled zooecia. 



9. .'\ zooecium and an avicularium highly magnilied. 



10. Mature uno\dcelled zooecia, X 20. 



11. Uno\acelled zooecia, X 20, illustrating appearance in young specimen, 

 a Miocene fChoptank formation); Cordova, Maryland. 



Figs. 12, 1.3. Cyclocolposa (?) spinifera new species, (p. 136.) 



12. The incrusting zoarium, X 20, with ancestrular zooecia. The pleurocy.st is incompletely 

 developed. 



13. A zoarium witli mature zooecia, X 20, showing the very thick frontal and the globular smooth 

 ovicel!. 



Miocene (Yorktown formation): 1 mile west of Fort Nonsense, Gloucester (.'ountv, Virginia. 

 I'iGS. 14, 15. Microporelln hexagona, new species, (p. 120.) 



14. The incrusting zoarium, X 20, showing the strongly calcified hexagonal zooecia. 



15. Another portion of the same specimen, X 20, illustrating the hexagonal shape of the zooecia, 

 the large ascopore with its salient peristome and the triangular avicularia. 



Miocene (Duplin marl): Darlington Courthouse, South Carolina. 

 Fig. 1G. Dakaria grnndis, new species, (p. 97.) 

 The incrusting zoarium, X 20. 



Miocene (Yorktown formation): Yorktown, Virginia. 

 264 



