136 



G. UNDSTHOiM, IIELIOLITID.E, 



Fig. 23. 



24. 



25. 

 26. 

 27. 



Acantlwlithus lateseptatua n. p. 11.8. 



A caliulc magniticd, '"/i, witli thc surroundiug 

 coeucuchyina. Specimen belougiug to the 

 Geological Survej' of Sweden, fouiul iu a 

 inorainic mäss ncar Kopparsvik, Wisby, 

 Gotland. 



Section of the same, a littlc below thc surfacc. 



Section 

 Surface 

 Bottom 



hjwer down. '^/i. 



in natural size. 



stratum of the polypary just above 



12/ 



Fig. 28. 



29. 



30. 



the epithecal stratum. '^/i. The black 



branching figures probably caused by para- 

 sites. 

 Microscopic structurc of thc epithecal stvatum 



Longitudinal section showing thc scarce, cou- 

 cave tabulce iu the cocnenchyma and in the 

 calicle, and also the epithecal stratum iu 

 bottom, like a crusta. '^/i. 



Auother longitudinal section with denser coe- 

 nenchynia and the same epithecal stratum. 

 Lacunte througb parasitcs or iuorganic. '^/i. 



Acantholitkus asteriscus p. p. Feku. Kdemeu p. 113. 



Fig. 31. Calicle aud coenenchynia of a specimen from 



Wormsö, Estland, '^/i. 

 » 32. A transverse, somewhat oblique section of the 



same. ''^/i. The left part deepest. 

 » 33. Longitudinal section of the same. ^^/i. 

 ■o 34. Magniticd part of a surface, from Wormsö, 



Estland. ^Vi. 



^'ig. 35. Surface with two caliules, niagnirtcd. ^^/i. 

 From the original specimen of Ferd. Roe- 

 mer's Heliolites interstinctus in Silur. Diluv. 

 Geschiebe von Sadevvitz, Taf. iv, fig. 4, 

 belonging to the Palseontological Museum 

 at Breslau. 



Plasmopor a Stella n. p. 83. 



Fig. 36. Transverse section of a specimen from the 

 stratum a near Wisby. To observc the 

 most regular aureolas. ^/i. 



Fig. 37. Longitudinal section of the same. The larger 

 aurcolar space on both sidcs of the calicular 

 tube clearly discernible from the other coc- 

 nenchyma. Vi- 



