KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 32. N:0 I. 87 



Plasmoporaf reticulata n. 



Pl. VII, figs. 34—36. 



Corallum disciform. The calicles circular, 1,5 millim. without the least vestiges of 

 septa, the narrow theca being only a little indented at the point, where the radii of the 

 aureola meet it. The tahulce are closely set and regularly horizontal. The aureola is 

 distinct though very narrow, in width a third of the calicular diameter. Its twelve 

 compartments are unequal, often broader than long, the abundant coenenchyma has seemingly 

 regular polyedric tubes of greatest brevity, but these are in fact formed by the transver.sally 

 sectioned coenenchymal lamellte. The short aculie have in great abundance grown upon the 

 convex lamellse of which the whole vesicular coenenchyma is composed. This species has 

 been frequently found in the Arachnophyllum stratura a around Wisby. The lougitudinal 

 section fig. 36 also informs us, how an older set of calicles has been overgrown and 

 destroyed by coenenchymal growth and how this has turned sideways above a lacuna, 

 now filled with clay and formed new calicles which have budded up out of it. 



In the transverse section fig. 35, on the right hand, the short tubuli lie alongside 

 convex lamina3. It is with some doubt that I place this coral amongst the Plasmoporas 

 as its coenenchyma rather is more like that of the next genus. 



MiLNE Edwakds and Haime have described in Hist. Nat. Cor. III, p. 241 a species 

 of Plasraopora, Pl. micropora, as appertaining to the Devonian formation of Eifel, and they 

 have identified it with Astrea micropora Goldfuss (nomea nuduin) in the Museum of Bonn. 

 Professor Clemens Schluter has been kind enough to inform me that this fossil is no 

 Plasmopora, but a Devonian »Fistulipora», nearly allied to, if not identical with Schlutee's 

 Fistulipora cyclostoma, »Anthozoen des Rheinischen Mitteldevons», p. 161, Tab. xi, f. 7 — 8. 

 There is tlius no Plasmopora found younger than those from the uppermost beds of the 

 Upper Silurian. 



Gen. Propora M. Edw. & H. 



1838. Astrfea p. p. Anqelin, Museum Paleoiit. Scand. 



1839. Porites p. p. LONSDALE, MuECH., Sil. Syst., p. 687. 

 1844. Sarcinuhi DALE Owen, Uept. lowa, Wisconsin etc, p. 76. 



1849. Propora Edw. & H., Comptes Rendus, XXIX, p. 262. 



1850. Astrseopora p. p. d'Orb., Prodr., I, p. 50. 



1851. Paleeopora p. p. M'C0Y, Palaeoz, Foss., p. 18. 



1851. Lyellia p. p. Edw. & H., Pol. palaeoz., p. 150. 



1852. Heliolites p. p. Hall, Billings etc. 



1878. Pinacopora Etheridge & NiCHOLS., Girvan, p. 52. 



1885. Plasmopora LlNDSTR., Foss. Gotl., p. 18. 



