Correspondence — Prof. G. Linchtrbm. 191 



commonly called Palceocijclus Fletcheri. One of tliem so exactly 

 resembles the figures 3, 3a, on plate 57 of M. Edwards' British 

 Fossil Corals, that it might well have been the original of that figure. 

 Now on this, as well as on the other specimen mentioned, the epithecal 

 scales are as jjlainly visible as on the Gotland spechnens. 1 have 

 not the least doubt that on closer examination more English specimens 

 with scales in situ will turn up. In consequence of the fact now- 

 adduced, the assertions of Prof. Duncan cannot any longer be upheld. 

 But even if the epithecal scales had not been found, there are such 

 fundamental discrepancies in the intimate structure of Cyathophyllum 

 and Pholidophyllum, as shown in the numerous figures of von Koch 

 and even in my memoir, that it is inconceivable how anybody still 

 can persist in placing Pal. Fletcheri or Phol. Loveni amongst the 

 Cyathophylla. 



I avail myself of this opportunity to correct some errors which 

 have crept into Prof. Duncan's quotations of my paper, on pp. 176 

 and 177 of the Quart. Journ. Geol. Soc, and for which I am not 

 responsible. In the translation of the generic description of Pholi- 

 dophyllum. Prof. Duncan has the following passage : " Loculi filled 

 with ' like-formed ' stereoplasma, numerous in the midst of the coral, 

 most frequently in regular equidistant tabula3." What this means I 

 for one am unable to understand. According to the Swedish original 

 there ought to stand : "Loculi filled with homogeneous stereoplasma, 

 in the midst of the coral are numerous tabulee, in most specimens 

 regularly distantiated." This description covers the English speci- 

 mens, as well as the Swedish, North American and Russian ones, 

 which I have examined. Further, Prof. Duncan has " Triplasma " 

 instead of Tryplasma, " Scurithodes " (/) for Acanthodes, " Halio- 

 phyllum " for Heliopliyllum, " Acanthocoenium " for Acanthoconium, 

 Palceocyclus, ^' porcatus " for P. prceacutus, etc. 



As to the genus Palceocyclus of Milne-Edwards, it contains at least 

 three generic types, viz. : 



1. Palceocyclus sensu, pr. T^'pe P. porpita, L., which probably 

 only occurs in Gotland. 



2. Pholidophyllum — Pal. Fletcheri. 



3. Genus novum. Pal. ragosus, altogether differing from the 

 former and pertaining to a special, as yet not defined genus. 



The retaining of Palceocyclus as an independent genus with P. 

 porpita as a type, does not imply that it must of necessity be kept 

 amongst the Fungidae. Already in 1865, I expressed my opinion 

 that it was to be regarded as a Rugose, in my first paper on the 

 operculated corals. The translation of this point in the Geological 

 Magazine, Vol. III. p. 144, not being exact, I give anew from the 

 original. " Its (= Pal. porpita) compact and solid structure, not 

 perforated nor spongy as in the Fungidce, its septa, which alternate 

 with the exterior folds (costas), give it a place in the Zoantharia 

 rugosa." G. Lindstkom. 



EoYAL Academy of Sweden, Stockholm. 



