12( 



n. LINDSTRÖM, IIELIOLITID.I^. 



Flasmopora petaliformis Lonsdale p. 77. 



Fijf. 1 — 5. TrausvtTse ;iiul lons;itudinal sections of two ' Fig. 7. Portion of tlie same magnitled. ''/i. 



difierciit specimens from Dudley, England. 

 ''II. Fig. 3 is tlie basal part of tigs. 1 & 2. 

 Fig. 5 shows to tbe riglit liow tbe structure 

 jirevalent in tlie coenencbyma of fig. 2 

 originatcs from tlie aculfe. Tbe septa, espe- 

 cially in tig. 4, partially destrnyed and 

 absorbed. 

 Surface, nat. size, of a speciinen from Stora 

 Carlsö. 



8, 9. Sections of the same. "/i. Observe in 

 fig. 9, central coenencbyma, aculae placed 

 in longitudinal rows and at last forming 

 bacilli. 



10 — 12. Sections of a specimen also from Stora 

 Carlsö. ''/i. Tbe sliaded, vcrtically streaked 

 patcbes in figs. 11 & 12 probably walls or 

 tbeca:' of coenencbymal tubnli, tbe section 

 going alongside these. 



''ig. 13. Tbe surfacc magnifiod 

 Boge, Gotland. 



Plasmopora, variety of P. petalifornils p 

 ''/i. From Tjeblers in 



78. 



Fig. 14, 1.5. Sections of tbe same. The dotted lines in 

 tlie rigbt calicular tube are rows of sei)tal 

 spines scen en face. ''/i. 



Plasinopora foroenais n. p. 78. 



Fig. 16. Surface, magnitied, ''/i, of a specimen from [ Fig. 21. Longitndinal section of a specimen from Slitc. 



Tjclders in Boge, Gotland, irrcgnlarly grown. ; "/i- 



» 17. Surface, maguified "/ii of a ty])ical specimen : » 22. A similar of a specimen from Slitc, Läniia- 



from Ryssnäs, Farö. [ berget, ''/i. 

 >i 1 8 — 20. Sections of a specimen from tbe same 



locality. Vi- 



Plasmojjora calyculata Ldm. p. 79. 



Fig. 23. Typical specimen from Norderstrnnd, Wisby, ' Fig. 20. Section a little below tbe surface, sbowing the 

 iiat. size. dissimilarity witli section (f. 27) taken lower 



» 24. Portion of tbe same, magnifiod. ''/i- down. 



» 25. A bud from tbe surface of tbe saine, rudi- > 27 — 29. Sections of specimen from Wisby, stratum 



nientary tbeca and septa. "/i. b. 'Vl 



.. 30. Longitudinal section of a S])cc.imen from Dud- 

 ley, England, ''/i. 



