PLATE XLVIIi. 



PAGE. 



Fig. 1. FISTULIPOKA COMMUNIS Ulr. (See also PI. XLVII) 476 



1. Vertical section, x!8. 



1. a. Tangential section, x!8, showing circular form of zooecia the absence of 



lunaria, and what appear to be minute perforations in the walls of the 

 interstitial vesicles. 



Fig. 2. FISTULIPOBA MONTICULATA Ulr. (See also PI. XLVII) 477 



2. Tangential section, x!8, showing slight development of lunaria, and rela- 



tive size of zooscia and mesopores. 

 2 a. Vertical section. x!8. 



Fig. S. FISTULIPOKA ASTRICA Ul.. (See also PI. XLVII) 477 



3. Tangential section, x!8, showing strongly developed lunaria and other 



features of the species. 



Fig. 4. FISTULIPOKA FOORDI Ulr. (See also PI. XLVII) 479 



4. Portion of vertical section from the surface down, x!8. 



4 a. Tangential section, x!8. showing form and relative size of zooacia and 



mesopores and the conspicuous lunaria. 



Fig. 5. FISTULIPOHA COLLINA Ulr. (See also PI. XLVII) 475 



5. Tangential section, x!8. The lower lelt hand, portion of the figure repre- 



sents a macula. To the right the zooeeia are separated by gradually 

 decreasing interspaces. 



5 a. Vertical section, x!8, showing the thin and lightly flexuous walls and 



several diaphragms wh'ch appear to be minutely perforated. 



Fig. 6. FISTULIPOBA ? COKKUGATA Ulr. (See also PI. XLVII) 480 



6. Tangential section. x!8, showing the structure of the zoarium just be- 



neath the surface, where the interspaces between the zooscia are 

 almost entirely filled with solid tissue. 



6 . Tangential section, x!8. showing the structure just above the basal 

 lamina. Here the zooecia are arranged in longitudinal series between 

 vertical plates, precisely as in Dichotrypa. 



6 b. Vertical section, x!8, showing the full length of the zooecial tubes, the 



interspaces filled with solid tissue above, moderately developed super- 

 ior hemisepta, and the wavy basal plate. 



