KOXGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 32. N:0 I. 51 



septal areas lie others with partly destroyed or as it were dissolved septa and again 

 further on calicles without any septa at all, that is to say, as decipiens. Such changes 

 make the determination and distinction very difficult or almost irapossible and necessitate 

 a series of transverse sections for comparison. 



There may have been very slight exteriör impalses to modify or alter and give a 

 multiplicity of deviating characters to some polyparies which fundamentally or by descent 

 are of the same stock. 



A list of synonj^ms now foUows enumerating the varlous forms which I consider 

 as identical with Heliolites interstinctus-decipiens, thus completing the list of synonyms 

 given above as pertaining solely to the typical form. 



1837. Astrsea porösa, HiSlNGER. Lethsea Suecica p. 98, pl. XXVIII, fig. 2. 



1850. Fistulipora decipiens, Mac Coy. Ann. Mag. Nat. Hist., 2^ Ser., vol. VI, p. 285. 



1851. » j Id. Palaeozoic Fossils p. 11, pl. iC, fig. 1, la, U. 



1854. Heliolites Miircbisoiii, M. Edw. & H. p. p. Brit. Foss. Cor., p. 250, pl. 57, fig. 6a, 6ä. Only the 



figures cited, not the description, indicate the identity. 



1854. Heliolites megastoma, M. Edw. & H. p. p. Brit. Foss. Cor., p. 251, pl. 58, figs. 2, 2a, 2h. The figs. 



2c, 2d belong to a Lower Siluriaii species of Coccoseris, of which see below. 

 There are no septa in the calicles, only in those of the Coccoseris figures, which 

 may have caused the authors to speak of »twelve small septa». I have examined 

 the original specimens which are preserved in the Mnsenra of Jardin des Plantes 

 in Paris and these do not present the least trace of septa and correspond to the 

 figures. 



1854. Fistulipora decipiens, M. Edw. & H. Brit. Foss. Cor., p. 298. 



1854. » » M'C0Y. Contrib. Brit. Palfeontol., p. 172. 



1860. Heliol. interstincta, Ferd. Eoemer, Tennessee, p. 23, Taf. II, fig. 5, bn. The enlarged figure. Sa, 



clearly shows the identity. 



1873. Fistulipora decipiens, I. W. Salter. Catal. Foss. Carabr. p. 103. 



1878. Heliol. interstincta, QUENST. Petrif. p. 143, pl. 148, fig. 25 (enlargement of coeuenchyma falsely drawn). 



1878. Heliol. megastoma, ID. Ibid. p. 143, 144, pl. 148, fig. 27, 30, 31. 



1880. Heliol. Murchisoni, NiCHOLSON and ETHERIDUE, Girvan p. 244. They say that it is closely allied to 



Hel. porosus and uevertheless they describe it as wanting septa. 



1880. Heliol. interstincta, Id., ibid. pl. XVI fig. 3, 3a, 4, 4o. 



1883. Heliol. decipiens, LINDSTRÖM in Eichthofen's China, Bd IV, p. 56, pl. V, fig. 6. 



1885. Heliol. pyriformis, Davis, Kentucky Fossil Corals, pl. l, fig. 5, 6. 



1885. Heliol. subtubnlatus, ID. Ibid. pl. l, fig. 7—8. 



1888. Heliol. decipiens, LINDSTRÖM, List of U. Sil. Foss. of Sweden, p. 21. 



1891. Fistulipora decipiens, WOODS, Catal. Type Spec. Cambridge, p. 18. 



1895. Heliol. decipiens, WentZEL. Zoanth. tabulata p. 33, Tab. IV, fig. 2 — 9. 



1895. Heliol. bohemicus, ID. Ibid. p. 31 Tafl. I, f. 8—9, Tafl. II, f. 1—4. 



1895. » » var. major, ID. Ibid. p. 33, Tafl. III, f. 8—9, Tafl. IV, fig. 1. 



There are local varieties in great abundance. From the stratum c of Tofta Gotland 

 we have semiglobose colonies with calicular openings rather more distant than else. The 

 circular, non indented Avall raised a little above the coenenchyma, which is faintly ele- 

 vated all around it or rather there is a minute mound of the coenenchyma with the 

 calicle on the top. 



