Plate 103. 



(Figs. 9-13, IS, 19 are after Ulricli.) 

 Figs. 1-14. Parfrctocycloecia duinosa Ulrieti, 1901 (p. 830). 



1. Fi'agments of the free, hollow, branched zoarium, natural size. 



2. Zoarial fragment, X 12, bearing an ovicell which is perforated by tlie tubes accom- 



panied by mesopores. 



3. Transverse section of a branch, X 12, cutting an ovicell. 



4. Branched fragment, X 12, showing that the dichotomization lias occurred in different 



planes. 



5. Branched fragment, X 12, with nonsalient peristomes. 

 6, 7. Specimen with salient peristome, X 12 and X 25. 



8. Transverse thin section, X 25. 



9. A branch broken longitudinally, X 9, showing central cavity. 



10. Small branch, X 9, showing two ovicells. 



11. A .specimen, X 20, showing an ovicell pierced by both the tubes and mesopores. 



12. A broken ovicell, X 20, showing tubes passing through it. 



13. Portion of the fractured end of a branch, X 20. 



14. Longitudinal thin section, X 25. The .solid portions are formed of flrmatopores. 

 Lowest Eocene (Bryoznan bed at base of Aquia formation) : Upper Marlboro, Mary- 

 land. 



Cat. No. 6.5239 U.S.N.M. 

 Figs. 15-17. Diplosolcn compactiim, new species (p. 746). 



15. Surface of the incrusting zoarium, X 12. Each tube is accompanied sometimes by 



several tubules. 



16. Normal aspect of the zoarium, X 12. 



17. Surface, X 25. 



I Lowest Eocene (Bryozoan bed at base of Aquia formation) : Upper Marlboro, Mary- 

 land. 



Oat. No. 65240, U.S.N.M. 

 Figs. 18-19. Ccriopora micropora Goldfuss (p. 079). 



The globular zoarium, X 6, and surface view of the same, X 20, of the .specimen 



referred to this species by Ulrich. 

 Eocene (Aquia formation) : Two and one-half miles above Popes Creek, Maryland. 

 104 



