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and zoological affinities of the Stromatoporoids, which the authors divide into two 

 families, and refer to the Hydrocorallines. It would, however, be unprofitable to 

 discuss at length the views on the above subjects propounded in the work now 

 under consideration ; since it may be reasonably assumed that the authors would 

 have materially modified many of their statements had they been acquainted with 

 the previously published "General Introduction" to the present Monograph, of 

 the existence of which they appear to have been in ignorance. The authors 

 retain the genus Coenostroma, Winch., as the type of their family Ccenostromidae, 

 upon the ground that it possesses astrorhizce ; whereas they assert these struc- 

 tures to be wanting in Stromatopora concentrica, Goldf., the type of the genus 

 Stromatopora. As a matter of fact, however, astrorhizse are always more or less 

 largely developed in Stromatopora concentrica, Goldf., so that the alleged distinc- 

 tion between Coenostroma and Stromatopora cannot be maintained. The authors 

 further propose five new genera of Stromatoporoids under the titles of Garterina, 

 Gircopora, Disjectopora, Irregulatopora, and Bosenia. Having had no opportunity 

 of examining specimens of the first four of these genera, I do not feel myself 

 competent to discuss their relationships. The last-mentioned genus, however, is 

 proposed for the fossil described by von Rosen under the name of Stromatopora 

 astroites, and I have shown that this is really a species of Actinostroma. The most 

 interesting and important point established by the researches of Waagen and 

 Wentzel is that forms of the Hydrozoa related to Stromatopora proper occur in 

 the " Productus Limestone " of the Salt Range of India, the age of which is 

 regarded as Permo-Carboniferous. We may, therefore, look forward with 

 confidence to the future discovery of Stromatoporoids in the Carboniferous rocks 

 of Europe and America. 



In 1889 Herr Joseph Wentzel published a memoir entitled " Leber fossile 

 Hydrocorallinen (Stromatopora und ihre Verwandten) nebst einem Anhange" 

 (' Lotos,' Neue Folge, Bd. ix, pp. 1 — 24, pis. i — iii) ; but this is essentially a kind of 

 abstract of the earlier portion of the work just spoken of, and, for reasons given 

 above, does not require detailed discussion. 



In 1889 Professor Lindstrom published a memoir with the title " Leber die 

 Gattung Prisciturben, Kunth " (' Bihang till K. Svenska Vet.-Akad. Handlingar,' 

 Bd. xv, Afd. 4, No. 9, p. 10, pi. i). In this memoir Lindstrom shows that the 

 genus Prisciturben, Kunth, is not referable to a Perforate Coral, but that it is 

 founded upon a mixed organism resulting from the commensalism of a Stroma- 

 toporoid and a Cyathophylloid coral. 



In 1889 appeared the second part of the present Monograph, in which 

 Actinostroma fenestration and Glathrodictyon confertum are described for the 

 first time. 



In 1890 the present writer recorded the occurrence in Devonian deposits in 



