Genera of the jN'okth American Palaeozoic Bryozoa. 573 



" The last of these modes is entirely restricted to the Aloyonabia ; 

 the second seems chiefly so, while the first has been observed up 

 to the present time in Fayositid^ and some Hexacoralla. 



"If we regard the MouTicuLieoRiDjs as a whole as they have 

 been circumscribed by Nicholson, we find in the forms thus com- 

 prised under the name that two of the above distinguished modes 

 of gemmation are observable, the intermural and the coenen- 

 chymal gemmations. According to the occurrence of the two 

 modes of gemmation two different groups of forms can be dis- 

 tinguished within Nicholson's Montiooliporidje, of one of which 

 the genus Mo.stioulipora, whilst of the other the genus Fistuli- 

 PORA may be considered the types. We take the two groups as 

 forming two different families, for the one of which we retain 

 the name Montiouliporid^, whilst for the other we create the 

 name F sTULiPORiD^. The latter family must, however, be removed 

 to the Alctonaria, a mode of proceeding which will be justified 

 later on. 



" In the MoN f iculiporidje, in this restricted sense, there remains 

 only* one method of propagation, the intermural one, which is 

 chiefly characterized by the circumstance that the young animal 

 formed by gemmation has no part in common with the mother 

 animal, so that it is impossible to say from which of. the surround- 

 ing animals the new one took its origin. It looks as if the new 

 animal were only filling up a void space between several old 

 animals. * * ^ 



" This gemmation is certainly very far different from the mode 

 of gemmation of Bryozoa as described above. The most radical 

 difference always consists in the circumstance that in the Bryozoa 

 the fully developed animals do not produce gems, but only the 

 quite young ones, which are themselves still more or less in the 

 state of buds. After this the next important difference is, that 

 in Bryozoa the mother animal can always be made out, which is 

 not the case in Monti julipora. 



"On the other hand the gemmation of Monticulipora is abso- 

 lutely identical with that occurring in the Favositid^. 



" If thus the mode of increase of the colonies of the Montiouli- 

 PORA seems not to be in favor of the supposition of these organ- 



