626 LINDSTRÖM. ON THE »CORALLIA BALTICA» OF LINN^US. 



this uncertainty may be still followed in his last edition of 

 Systema Naturs, in which he places most of the fossil corals 

 araongst the recent ones, but some of them also in »Regnura 

 Lapideum». 



In »Corallia baltica» he divided the Madreporee into three 

 artificial groups, simple, composite, in which the polypierites 

 cohere only with their base, and aggregate, in which they have 

 coalesced and are enveloped all around by a common epitheca. 

 In his descriptions of them he employed the term stella for 

 calyx, as it is now called. radii, or lamellce for septa, diaphragma 

 for tabulas, but also for the broad expansions around the calices 

 of Syringophyllum. Instead of stella he used porus for the 

 minute calicuiar openings of the Milleporge. 



I shall now give a review of the Gotland species described 

 by LiNN^us and try to identify them as far as possible, with 

 those described by later authors. He gave a wide expansion to 

 his species and in severa-l of them included different forms, as 

 for instance, his N:o I below. The difficulties arising form this 

 circumstance may be lessened by comparing the figures with the 

 descriptions, when we shall find that he bad a typical specimen 

 for both. In doubtful cases I have, when the descriptions are 

 not quite clear, given the preference to the figures and, when 

 these are too incorrect, to the descriptions. Rarely are both 

 unintelligible. 



In a few instances only I have given the complete synonymy, 

 but the Linnean synonymy as complete as needed, with the 

 latest established name of each species, where it was possible. 



Pag-e loj^) N:o I. Madrepora simplex, turhinata etc. Fig. 

 I, II, III, IV, VII. This species is more than any of those 

 mentioned below made up of corals belonging, not only to diß'erent 

 species but even to difl:erent genera. Linn^us also divides it 

 into the tbllowing five varieties, marked a — £, each corresponding 

 to one figure in the same order. 



') Refers to the page in the »Corallia», original edition, the next uumber is 

 that given by Linn.-eus and his »diaguoses» are printed in italics. 



