KONGL. SV. VET. AKADEMIENS HANDLINGAI?. 



BAN 



D 32. 



n:o 



117 



Plate IL 



HeliolUes inierstinctus L. p. 41. 



Fig. 1 . Transverse sectioii of a variety from the upjier- 

 most limestoue of Gotland (Tjelders Boge). 

 The black döts in the centra are sections 

 of the vertical reds. ^/i. 

 » 2. Longitudinal section of the same showing a 

 number of vertical rods on the tabulae, 



probably residiies from the coenenchymal 

 thecse out of which the calicular tube has 

 through gemmation been develojjed. The 

 microscopic fibrillae of the septal and thecal 

 lamell» are seen at left in the left tube. 



Vi. 



Heliolites interstinctiis-decipiens p. 48. 



Fig. 3, 4, 5, 6. Four calicles, that have grown on 

 the surface of the same polypary. F. 3 

 youngest with not fully developed septa, 

 f. 4 with twelve long septa nearly as Hel. 

 porosus, f. 5 like the regular Hel. iuter- 

 stinctus, f. 6 the commou typical sdecipiens» 

 without any septa and like all other calicles 

 of the same polypary, excepting the three 

 first mentioned. ''/i. 



3 7, 8. Transversal and longitudinal sections of a 

 variety from the Arachnophyllum stratum 

 near Wisby. ^/i. Concave tabulfe. 



» 9, 10. Sections of another speciraen, same lo- 

 cality, quite circular calicles without the 

 least indication of indentures. '^/i. 



» 11. Surface, nat. size, of a variety from Petes- 



vik, every calicular tube is raised on a little 

 elevation of the coenenchyma so as to be 

 thereby separated from its neighbours. 



» 12, 13. Sections of the same. The regularly cir- 

 cular calicles are environed by regular 

 coenenchymal tubes, of which some 13 — 14 



Fig. 14. 



15. 

 IG. 

 17. 



18, 



20. 



21. 



22. 



are regularly placed like an aureola around 

 the calicle. In the longitudinal section is 

 seen how the calicular tube arrises directly 

 out of the coenenchyma. *'/i. 



Surface, nat. size, of specimen from Wisby, 

 stratum d, with the large calicles osculat- 

 ing and raised above the coenenchyma. 



The same enlarged. ^/i. 



Var. bohemicus from Kozel in Bohemia. ^/i. 



Another specimen of the same, large calicles, 



nat. size. 

 19. Sections of n:o 17, approaching to inter- 

 stinctus. ^/i. 



Specimen from Biichel bei Paffrath Cöln, 

 like a decipiens. ^/i. 



Cast of Mac Coy's type specimen for bis 

 figure of Fistulipora decipiens pl. i, C, 

 fig. 1, »British Palffiozoic Fossils», now 

 preserved in the Woodwardian Museum, 

 Dniversity of Cambridge, England, natural 

 size. 



Part of the same enlarged. ^/i. 



Favosites (Fistulijjora) canadenns Billings p. 49. 



Fig. 20. 



s 27. 



Fig. 23. Surface of specimen from Widder, Canada, 

 nat. size, presented by Mr. Billings. 

 » 24. Enlargement of the same. Vi- 

 » 25. Part of the interiör showing oscula (pores) 

 and broken tabulsB. i**'!. 



K. Sv. Vet. Akad. Handl. 



10/ 



Band 32. 



Nio 1. 



Another specimen, same locality, beiiig more 

 highly silicified. 



Surface of the same, one large calicle en- 

 vironed by smaller, "/a. 



15 



