628 LINDSTRÖM, ON THE >CORALLIA BALTICA» OF LINN^US. 



but the figure may with a high degree of certainty be set down 

 as Cyathophyllum mitratum HiSINGER. 



P. 19, N:o IT. Madrepora simjolex, orhicularis, plana; 

 Stella convexa. Fig. V. 



1749 The same description in Am. Acad. I, p. 91. 



1753 Porpita, Helmiutholithus, Hafspenning, Kräksten af 

 Manetter. Museum Tessinianum p. 96, 97. 



1767 Madrepora Porpita L. S. N. ed. XII, 1272. 



1819 » » Wahlenberg, Petrific. Teil. Sue- 



canse p. 95. 



1850 Paleeocyclus porpita Edw. H. Brit. Foss. Cor. XL VI. 



Strangely enough LlNN^us does not mention this most 

 common Gotland fossil in S. N. X, nor in Fauna Suec. In 

 S. N. XII he raixes it up with several other fossil corals and 

 says »frequens inter Petrificata Europaea». 



P. 21, N:o III. Madrepora composita, corporibus proliferis 

 e centro plurihus undique -coadunatis; Stella convexa, centro- 

 concava fig. IX and fig. n. 2 and also flg. VIII. 



1749 » » Am. Acad. p. 92. 



1758 Madrepora ananas, L. S. N., ed. X, 797. 



1761 » » L. F. Su., ed. II, 536. 



1767 •> » S. N., ed. XII, vol. I, p. II, 1275, 



1819 » » Wahlenb., p. 97. 



1850 Acervularia ananas Edw. H., Pol. palaeoz., p. 421. 



In Corallia baltica LiNN^us distinguishes plainly between 

 the two different forms which Fougt has delineated in fig. VIII 

 & IX and he says expressly, concerning the latter »radiis cen- 

 trum cavum occupantibus», which is not the case Avith the former. 

 In Syst. N. ed. XII p. 1275 again he confounds it with a recent 

 coral and refers both figures to M. ananas, contrary to what he 

 did in F. Suec, where he cites only fig. 9 & fig. 2. He says 

 (S. N. 1. c.) about the transversal section, after comparing it 

 to the back side of playing cards, »maculis sexangularibus et 

 inträ singulas maculas annulum album ( = the interiör wall) cum 

 striis inter rete et annulum, non vero inträ ipsum annulum», a 



