Plate 25. 



Figs. 1, 2. Holoporella (?) echinala, new species, (p. 177.) 



1. The globular zoarium, natural size. 



2. Zooecia, X 20, showing two oral spines and the absence of areolar pores. 

 Miocene (Yorktown formation): Yorktown , Virginia. 



Figs. 3-6. Holoporella orbi/crii, new species, (p. 177.) 



3. 4. Two examples of the irregular, massive zoaria, natural size. 



5. Portion of the zoarium, X 20, mth large interzooecial avicularia. The areolar pores, the 

 convex frontal, and the form of the apertura are well shown. 



Pliocene (Waccamaw marl) ; Waccamaw River, Horry County, South Carolina. 



6. Another surface, X 20, illustrating the usual characters noted. 

 Miocene (Duplin marl): Wilmington, North Carolina. 



Fig. 7. Holoporella viassalis, Ulrich and Bassler, 1904. (p. 177.) 



Surface of the original type, X 20. 



Miocene (St. Mary's formation): St. Marys River, JIaryland. 

 Fig. 8. Cellepora cribrosa Ulrich and Bassler, 1904. (p. 1S3.) 



Photograph of the type specimen, X 20. 



Miocene (Calvert formation): Reeds, Maryland. 

 Fig. 9. Holoporellasubturrita, new species, (p. 176.) 



The incrusting zoarium, X 20, illustrating the four prominent rostra with avicularia, about each 

 apertura. 



Miocene (Duplin marl): Tweuty-eight miles northwest of Wilmington, North Carolina. 

 Figs. 10-13. Cellepora minula, new species, (p. 182.) 



10-12. Two zoaria, natural size, with a thiixl cut through the middle, showing growth upon gas- 

 tropod shells. ... 



13. Surface of a zoarium, X 20, illustrating the small size of the zooecia, a single row of areolar 



pores and the occurrence of small tuljular avicularia only. 



Miocene i, Duplin marl); Wilmington, North Carolina. 



FiG.s. 14-20. Cellepora viaculala Ulrich and Bassler, 1904. (p. 182.) 



14-lG. Three zoaria, natural size, growing as usual upon gastropod shells. 



17. Drawing of the surface, X 17, illustrating the shape of the apertura and the two kinds of 

 avicularia as well as the areolar pores. 



18. Photograph of zooecia, X 20, illustrating the large interzooecial avicularia. 



19. A section through a zoarium, X 10, showing the accumulation of the zooecia. 



20. An enlargement of the same. X 25, showing the arrangement and structure in more detaU. 

 Miocene ( Calvert formation): Plum Point, Maryland. 



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