GENERAL HISTORY. 25 



seem to be really the cut edges of perforated and incomplete 

 tabulae, such as are so characteristic of some types of Steno- 

 pora, Lonsd. (see the long section of 6". Hozvsii, Nich,, fig. 

 12, b). 



The genus Monticulipora, D'Orb., in the restricted sense in 

 which it is understood by Dybowski, is divided into two prim- 

 ary sections. The first of these is defined as comprising poly- 

 morphic coralla, with or without monticules (" Hugelchen") ; 

 the corallites tubular, of different diameters, with thick, lamel- 

 lar, amalgamated walls. No " Wandstrange " or " Wandrohr- 

 chen " {i.e., aborted or perfect spiniform corallites) are present. 

 Tabulae present. The forms included under this head are M. 

 rugosa, E. and H., which is, in the main, rightly described 

 and figured ; M. Wesenbeigiana, Dyb., which is very closely 

 allied to the preceding ; and M. csdilis, Eichw., which is related 

 to M. Treiitonensis, Nich. All these three forms belong to 

 the section Heterotrypa as defined by me ; but Dr Dybowski 

 has failed to recognise that the interstitial corallites are other 

 than young tubes, and he has not observed that they have the 

 structural peculiarity of being much more closely tabulate than 

 is the case in the laro-e corallites. The absence of aborted or 



o 



perfect " spiniform corallites " (" Wandstrange " and " Wand- 

 rohrchen"), upon which Dybowski relies in separating this 

 section of Monticnlipora from the second, as also from Orbi- 

 pora, Eichw., is, according to my views, a matter of no classi- 

 ficatory value at all. 



The second section of Monticulipora, D'Orb., according to 

 Dybowski, comprises forms quite like those just mentioned, 

 except that they possess numerous " spiniform corallites " 

 (" Porenkanalchen "). As just remarked, I attach no weight 

 to this circumstance. The only form described under this 

 section is one which Dybowski thinks to be possibly the so- 

 called Chcetetcs lycopei'doii, Say ; and the figures and descrip- 

 tions given of it show it to be allied to M. (^Heterotrypa) moii- 

 i I if or mis, Nich. 



The eighth genus in Dybowski's classification is one which 



