144 MADREPORARIA. 



it is the same, and why it slioukl suddenly find its way into specimens of Stony Corals, also 

 wliether it only attacks stray specimens, or is normal to certain varieties, are points to he 

 investigated. In Vol. I. p. 47 of this Catalogue (Madrepora) Brook seems to have regarded it 

 as purely accidental, for one of the " species " accepted hy him, with the suspicious name 

 " multiformis " (Ort.), included a few blue specimens, and further the specimens labelled by 

 Brook Mad. sccalc are also blue and white mixed. In neither case did he mention tlie fact 

 in his descriptions. 



