KONGL. SV. VET. AKADEMIENS IlANDLINGAK. BAND 32. N:0 I. 



123 



Plate Y. 



Heliolites repletus n. p. 65. 



Fig. 1, 2. Transversc sections to show the altered coe- 

 nenchyma when there is a fascia formed. 

 Especially in fig. 2 it is much modified 

 with thick walled tubes having a false ap- 

 pearance as if provided with septa. I do 



not feel quite sure whether this mnch de- 

 viating structure raay not be due to the 

 intrusion of a semi-parasitic Favositoid co- 

 lony. Both from the lowest strata b near 

 Wisbv. 8/i. 



Heliolites parinstella var. intricata n. p. 63. 

 Fig. 3. Sorae incipient calicles to show their development out of the eoenenchyma. From Djupvik in Eksta. */i. 



Cosmiolithus ornatus n. p. 68. 

 Fig. 4. Transverse section of a speciraen from the j Fig. 8. Surface of another speciraen, nat. size; same 



5. 

 6. 



7. 



Arachnophyllum shale a uear Wisby. '^/i. 

 Lougitudinal section of the same. ^^/i. 

 Part of the surface, natur, size of a specimen, 



same locality. 

 The same raagnified. ^-/i- 



9. 

 10. 

 11. 



locality. 

 Transverse section of the same. ^Vi- 

 Longitudinal section of the same. ^^/i. 

 Lougitudinal section of a specimen with more 



slender walls, from Klinte. ^^/i. 



Cosmiolithufi halysitoides n. p. 69. 



Fig. 12. Part of the surface of specimen from Wisby, 

 stratum a. 

 » 13. The same magnified. ^^/i. 

 » 14. Longitudinal section of the same. '^/i. 

 » 16. Surface of another specimen, magnified. ■'^/i. 



Fig. 16. 



17. 



Longitudinal section of the same. 'Vi- Irre- 



gular lacunse in the septal laminte not struc- 



tural. 

 Transverse section deeper down of a third 



specimen from stratum a. ''"^/i. Coenen- 



chymal thecae tightened. 

 Longitudinal section of the same. '^/i. 



Plasmojjora Stella n. p. 83. 



Fig. 19. Part of the surface, specimen from the stratum 

 a Wisby. Vi- 

 » 20. Transverse section of the same. Vi- 

 3 21. Longitudinal section of the same. Vi- 

 3 22. Transverse section of another specimen, same 

 locality, "/i; with small projections like 

 costse on the outside of the theca. 



Fig. 23. Transverse section of a specimen from Katten- 

 tack, Estland. Vi- 

 3 24. Longitudinal section of the same. "/i. 



25, 26 Sections of a specimen from the stratum 

 a near Wisby. 



