590 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Homotrypa nodulosa, new species, p. 582. (See also Plate XXV, fig. 15.) 



Figs. 5, 6. Vertical sections X 20 and X 30, illustrating the internal i-haracters. 



7. Tangential section X 20, showing large acanthopores and few mesopore8,,| 



8. Tangential sectif»n X 20, with numerous mesopores. ': 

 9-11. Three fragments, natural size. 



Richmond formation, Hanover, Ohio. 



lb»nt)triipa ohliqua Ulrich, p. 575. 



12. ^'ertical section X 20. 



i:i Natural size view of a complete zoarium of the fi)rm found in the Fai' 

 mount beds. 



14. Natural size view of the prevailing form in tlie Bellevue l)etls. 

 Lorraine formation, Cincinnati, Ohio. 



Ilomotrijpa rurvdtd var. pritcipta, new variety, p. 575. 



15. Fragment of zoarium, natural size. Utica formation, West Co\ingtoj 



Kentucky. 



Plate XXIV. 



Homotrypa richmondemh, new species, p. 582. 



Fig. 1 . Tangential section X 20, through the fully matured region. 



2. Vertical section X 20. 



3. Tangential section X 50, illustrating the structure of the walls and acanth 



pores. 

 Richmond formation, Hanover, Ohio. 



4. Specimen of the natural size. 

 Richmond formation, Richmond, Indiana. 



Homoiriipa attstini, new species, p. 584. 



5. Tangential section X 20, showing the wide intermural spaces. 



6. Vertical section X 20, illustrating the distribution of the cystiphragms. 



7. Fully matured condition of a single zooecium X 50. 

 8,9. Fragments of zoarium, natural size. 



Richmond formation, Dutch Creek, near Wilmington, Ohio. 



Homotrypa vortheni (James), p: 583. 



10. Vertical section X 20. 

 11, 12. Tangential sections X 50 and X 20, illustrating the characters of the matu 



region, the latter showing communication pores. 

 13, 14. Fragments of zoaria, natural size, showing variations in size and surfa 

 characters. 

 Richmond formation, Richmond, Indiana. 



Homotr)jpa wurthevi var. pronmiens, new varietj', p. 584. 



15,16. Natural size views of two fragments. Richmond formation, Elkho 

 Creek near Richmontl, Indiana. 



Homotrypa wortliciii var. interce/lata, new variety, ji. 584. 



17. Tangential section X 35, through mature region. Richmond formatic 

 near Osgood, Indiana. 



