of the Authozoa TahnlaUi. 9 



BesuU'S tlje (lifVerence in their structure, there is also this dis- 

 similarity betwroii those aimli)<^ous structures in the Favositidic 

 and tlie Bryuzoa — that in the hitter they are re^uhir, and cause 

 the cliaracteristic patches and eminences, whereas in the former 

 they spread along the upper border of the epithcca, and thence 

 become scattered over single calices. 



In the Paheozoic strata there occur, besides the nowdescribed 

 MontiruI!j)orii\, a great many related Bryozrta. Of this nature, 

 for instance, is the Silurian MonticuUpora {Callopora) Fletcheri, 

 E. & II., with its regular oblique macular, and others with 

 narrow branches. Allied to these is a TremaUjpora with jointed 

 branches ; and this genus leads to others, such as the common 

 Gliinconome (/istir/m, Goldf. [=VincuIaria 7iO(/bsa, Kichw.), 

 which also had their stems divided by joints, just as in 

 the recent Bugida Murrayaiiaj Bean, and Cellaria horcalis, 

 Busk. 



In the next ])lace, I may give a list of all the genera wliich 

 by some authors are still regarded as Tabulate Corals, but 

 which, in my opinion, must be eliminated from that class, and 

 numbered amongst the Bryozoa. It may be objected that 

 most of these are provided with tabula?, which have never as 

 yet been observed m the zooecia or proper cells of the Bryozoa, 

 but only in the interstitial cells (Fr. Smitt, loc.cit. pp. 476, 477). 

 The development of the Palasozoic species, however, out of 

 ])olyzoaria which have such a decided affinity to the recent 

 Discoporelke and others, couj)led with the total absence of all 

 septa, points with logical necessity to the above conclusion 

 as to their systematic position. They must be placed with 

 the Bryozoa, in the same way that the Cirripedia were re- 

 moved from the Mollusca to the Crustacea, when their develop- 

 ment became known. Even as regards some genera the deve- 

 lopment of wliich is still unknown, there are points of struc- 

 tural affinity with unquestionable Bryozoa which render their 

 reference to this class highly probable. 



Callopora, Hall (Pal. N. Y. vol. ii. p. 144). To this genus 

 belong MonticuUpora Fletcherij E. & H., and M. pulchella, 

 E. & H. 



Cen'opora, Goldf. (Petref Germ. i. p. 32). According to 

 D'Orbigny this genus is Brjozoan; but ^lilne-Edwards iden- 

 tifies the Palaeozoic species with Monticnlipora. 



Chivtetes^ Fischer von Waldheim (Oryct. Gouv. de Mosc. 

 p. 159). Later authors have given this genus a much greater 

 expansion than that allowed to it by Fischer, who included in 

 it C. radians and its varieties. D'Orbigny (Cours de Pal. 

 vol. ii. p. liO) refers some species to the Bryozoan genus 

 Polytreina, Risso, and retains only four as corals. Lonsdale 



