lNal323. STRUCTURAL FEATURES OF IIOMOTRYPA-BASSLER. 591 



Plate XXV. 



ITomo(ri/j>((. mmulo.su, new species, p, 585. 



Figs. 1, 2. Vertical and tangential .sections X 20, illustrating the internal characters 



3. Tangential section X 50, through fully matured region of several zocecia. ' 



4. Natural size view of a nearly complete zoarium. 



Richmond formation, Versailles, Indiana. 



llomntrupa nitida, new species, p. 586. (See also Plate XX, fig. 15.) 



5. Tangential section X 20. 



6. Vertical section X 20, showing form and dislril.ution of cystiphragms and 



diaphragms. 

 7, 8. Natural size views of fragments. 



Richmond formation, near Osgood, Indiana. 



Homotrypa dawsunl (Nicholson), p. 581. 



9. Vertical section X 20, showing distribution of cystiphragms. 

 10. Tangential section X 20, through fully matured region. 

 Richmond formation, Waynesville, Ohio. 



Homotrypa spkndens, new species, p. 587. 



11, 12. Vertical and tangential sections X 20, illustrating the internal characters 

 of the species. 



13. A single zoa-cium X 50, as seen in tangential section. 



14. Natural size view of a fragment of a frond of this species. 



Richmond formation, Wilmington, Illinois. 



Homutri/pa nodulosa, new species, p. 582. (See also Plate XXIII, figs. 5-11.) 



15. Tangential section of a single zocecium X 35, showing communication 



pores. Richmond formation, Hanover, Ohio. 



