2 8 THE GENUS MONTICULIPORA. 



of these the author observes that it is distinguished by the 

 possession of thick strongly granulated " intercellular spaces ; " 

 and he adds that, " when slightly worn, the granules or 

 spines are seen to be simply surface-extensions of curiously 

 modified minute tubuli." This, so far as I know, is the first 

 clear recognition of the singular "spiniform corallites " of so 

 many of the Monticuliporcu ; since Dybowski seems to regard 

 his " Wandrohrchen " and " Wandstrange " as mere accessory 

 structures. The author, moreover, refers Alonticidipora {Chce- 

 tetes) Oj^toni, Nich,, to a new genus of Poiyzoa, which he 

 names Atactopora, and of which he supplies descriptions of 

 several new species, with which I am not acquainted. So far 

 as M. ? Ortoni, mihi, is concerned, I shall afterwards give 

 reasons for thinking that it will be difficult, with our present 

 knowledge, to separate it definitely from Monticulipora, with 

 some species of which it shows remarkable affinities, at the 

 same time that it has equally singular features of its own. I 

 fail, at any rate, to recognise in it the fundamental feature 

 which Mr Ulrich considers to separate his genus Atactopora 

 from Monticulipora, D'Orb. — namely, the presence of pseudo- 

 septa. 



Towards the close of 1879 I published a work on ' The 

 Structure and Affinities of the " Tabulate Corals" of the Palae- 

 ozoic Period,' in which I gave a general account of the struc- 

 ture, development, and systematic position of Monticulipora 

 and various allied types. I also submitted a provisional classi- 

 fication of the forms included usually under the comprehensive 

 genus Monticulipora, and I gave an account of the structure of 

 typical examples of some of the more striking and characteristic 

 forms of the group. I need not give any analysis of the above 

 work, since the bulk of that portion of it which dealt with 

 MontictUipora is incorporated, with great additions, and with 

 some alterations, in the present treatise. 



Lastly, in 1880, Mr E. O. Ulrich published a list of the 

 species of ]\Iontictilipora and allied genera known to him as 



