KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 32. N:0 I. 27 



Every one of these pseudosepta is continued downwards by a narrow, not much 

 prominent ridge, the interiör wall of the calicle being consequently fluted, as it were, 

 through cjuite as manj' grooves as there are ridges or pseudosepta round the aperture. 

 The ridges are regularly provided with short knobs. 



The tabuUe in the calicles, as well as in the coenenchymal tubes are by far not 

 so numerous as one could think by the figures given by several authors. They are very 

 thin, concave and situated at a great distance from eaeh other and moreover often de- 

 ticient in the most narrow coenenchymal tubes. ^ 



Houghtonia, see Calapoecia. 



Lyopora, see Calapoecia. 



Milleijora L. Much needs not to be said concerning this genus, since the discoveries 

 of Agassiz and Moseley have shown that it is a Hydrozoon and their vievvs have been 

 accepted by all authors. 



Polysolenia Reuss in »Reise der Novara. Geologischer Theil» 2'' Bd, p. 172, Taf. 2, 

 tig. 3. — This fossil coral, which Zittel regards as one of the Helioporidaä, and conse- 

 quently according to his views as nearly related with Heliolites, was found in the tertiary 

 formation of Java and by its founder compared with Polytremacis and Heliopora. The 

 calicles have eight constant septa, seemingly in two cycles of four septa each, the coenen- 

 chyma consists of circular tubes with thick walls and are tra^^ersed by regular, horizontal, 

 though scarse tabulse. In the calicles, if I understand the section fig. 3rf rightly, the tabulaä 

 are more numerous and intersected by the septa. Thus far, as the figures show. In the 

 descriptive letterpress, however, Reuss tells that there are no »Quersepta», and that the 

 Avalls of the coenench3'mal tubes are perforated through »Quercanäle» (traverse tubes). 

 It seems, ho\\'ever, that he has mistaken the tabulse for tubes and that he thinks the 

 loculi between the septa to be the septa themselves. By what now lias been stated, con- 

 cerning its structure, sufficientlj' is showii tliat this genus b^^ no means can be considered 

 as related to the Heliolitidaä. 



Polytremacis D'Orbigny. I cannot find that this author ever gave a clear de- 

 finition of this genus. It seems that he considered Pol. Blainvilleaua (Heliop. Blainvilleana 

 MiCHELiN loonographie p. 27 fig. 6a — 66 not fig. 8) as the type species as he inentions 

 this first. Milne Edwards & Haime, \v\\o follow him, sa}^ that the septa in this genus 

 are \\'ell developed and so large that thev nearly meet in the centre of the calicles, but 

 this is not the case in any of the species known, excepting that which Reuss, according 

 to my view, wrongly called Pol. Blainvilleana and which if exactly figured can not pos- 

 sibly belong to this genus." All the others have short septa and the surface is as in a 

 Heliopora. That remarkable coral again has according to the figures of Reuss twelve regular, 

 equalsized septa, stretching near to the centre surrounded by a tubular coenenchyma 

 with horizontal tabulte and the calicles have concave tabula^, the whole thus giving a real 

 Heliolitideaii appearance. But when wt- turn to the printed descriptioii it is stated that 



^ BOURNE (Heliopora) romiirks oti tbe difforenco in tlic ijropagatiou of the copiiencliyinal tiibps in Heliolites 

 in opposition to that of Helioi)ora and Favosites. — Favosites can seai'cel}' lie J>rought iu comparisou witli 

 these as there is no coenenchyma. 



- Wiener Denlvschriften vol. 7 (1854) \,\. 24 fig. 4—7. 



