Plate 30 



Page 

 Figs. 1-4. Spinopora niitra Goldfuss, 1827 . 34 



1, 2. Colony, natural size, and the same enlarged. 



3. Longitudinal section, X9, showing the tu])es (o) with 



numerous diaphragms, and the solidified wide tubes 

 (.s), forming the spinous tuberosities of the surface. 



4. Tangential section, X26, showing the irregular spines 



which line the interior of the tubes. 

 (1-4, after Hennig, 1894.) 



Figs. 5-S. Neuroporclla ignabergensis Hennig, 1894 34 



5, 6. Colony, natural size, and the surface enlarged, show- 

 ing the nervures and the centers of convergence. 



7. Meridian section, showing the structure of the tubes, 



with luimerous diajjhragms, and of the solidified 

 tube (.s), corresponding to the nervures. 



8. Tangential section through a portion with nervures. 



(5-8, after Hennig, 1894.) 



Figs. 9-19. Neuropora conuligera Hennig, 1893 32 



9-12. Lateral view of four colonies, natural size. 



13. Superior view of a lobe, X12, showing the nervures 



and their center of convergence, a. 



14. Longitudinal section, X4. 



15. Portion of a longitudinal section, X25, showing 



the reciprocal arrangement of the tubes, with dia- 

 phragms and their thickened vesicular walls (p). 



16. Portion of a longitudinal section, X9, showing 



false zonal lines and the structure of the zooecial 

 walls. 



17. Portion of a transverse section, XIS. The central 



portion a is formed of ascending bundles of 

 tubes; the peripheral portion b shows the re- 

 curved part of the tubes, with their usual 

 structure. 



18. Central part of a transverse section, X75, showing 



the polygonal zooecia and the walls (p) of pari- 

 etal vesicles. 



19. Tangential section, X18, exhibiting the solidified 



tubes a, s, forming the nervures. 

 (9-19, after Hennig, 1893.) 



Fig. 20. Neuropora micropora, new species 33 



Longitudinal section, X50, showing the microscopic struc- 

 ture of the walls. 

 Lower Cretaceous (Aptian) : Faringdon, England. 



123 



