70 G. LINDSTRÖM, HELIOMTIP;!':. 



Gen. Proheliolites. Ki^b. 



1858. Heliolites Fr. Schmidt. Untersiiclniiia; Silur. Estlands, Ai'cliiv, p. 228. 



1897. Proheliolites KliER. Faunistisclie Ueljeisicht der Etage 5 des Norweoischeii Silurgesteins, p. 10 (nomen 



nudum). 



Gorallum consisting of rninute circular calicles with twelve septa, the basis of which 

 reseinbles that of Heliolites, but the spines that are attached to them at regular distances 

 are directed downwards, contrary to what is prevailing in all other Heliolitida?. The 

 coenenchyraa is of the scarcest kind and only a few single tubes are foiind between the 

 calicles. A single tube, which has the tabulie raore close than the calicles, can by ex- 

 panding be changed into a calicular tube. Lower Silurian. As to its systeraatic place it 

 ought perhaps on account of its grcat structural deviations from other corals form a 

 family of its own, but it niay stånd as an appendix to the Heliolitidiie with which it 

 else shows the greatest affinity. 



Proheliolites dubius. Fr. Schmidt. 



Pl. XI, figs. 10—17. 



1858. Heliolites dubia Fr. SchMIDT. Untersueh. Silur. Estlands, Arcliiv, p. 228. 

 1861. » » Ferd. Roemer. Sadewitz, p. 26, tal). IV, f. 5— 5a. 



1861. » » TÖRNQUIST. Lagerföljden i Dalarnc, p. 19. 



1873. Heliol. favosus LiNDSTR. (nec M'COY). Svenska Undersil. Corall. p. 23. 



1879. Hel. dnbia DyBOWSKI. Cluietetiden der Ostbaltisclien Silurformation, p. 113, tab. IV, f. 2— 2ffl. 



1880. Heliol. dubius Ldm in ANGELIN, Fragmcnta Silur., p. 32, tab. I, figs. 1 — 4. 

 1880. Hel. dubia NiCHOLS. & P^THERIDGB. Girvan, p. 250. 



1883. Hel. dubius Ferd. Roemer. Leth. Geogn., p. 505. 



1885. » » ID. Leth. erratica, p. 313, Taf. IV, fig. 13 a, b. 



1888. » » LiNDSTR. Fossil Faunas Swcden, I, p. 23. 



1889. » » NiCHOLSON. Manual Palieontol., I, p. 336, tig. 217 A, B (upside down). 



1894. Hel. dubia Weissbrmel. Korallen Silurgesohiebe Ost-Westprenss., p. 666, pl. LIII, figs. 4a, 4/; (these 



tigures do not show the real characters). 



1895. Heliolit. dubius Wentzel. Zoanth. tabulata, p. 30. 



1896. » » SakdesoN. Foss. Tabulaten, p. 270, figs. 11—12, p. 285, fig. 19. 



1897. Proheliolites dubius Kl^R. Faun. Uebersicht der Etage 5, p. 10 (without deseription). 



The coral generally has grown in sphaaroid and even seiniglobose masses with a 

 flat basi.s, in the former cases with calicles on all sides. A speciinen from Lissberget in 

 Dalecarlia measures 10, 12 cm. by 9 cm. A characteristic feature in this species is that the 

 small and as a rule perfectly circular calicles are so closely crowded that there is verj' 

 little coenenchyma between them. Thej^ have a diameter of 0,8 millim. In some instances, 

 even on polyparies, which for the rest have quite normal calicles, some of these (fig. 12) 

 are irregular, almost polyedric, contiguous, without any coenenchyma. 



