253 



CHAPTER XII. 



CH/ETETID^ AND MONTICULIPORID^. 



Using the name ChcEtetida: in the wide and general sense in 

 which it has been usually employed, and temporarily including 

 under this title the genus Monticulipora and its allies, we 

 find that the group now under discussion comprises massive, 

 ramose, laminar, or encrusting corals composed of contiguous 

 tubular corallites, which are intersected by complete tabulae, 

 and are destitute of mural pores. There are either no struc- 

 tures of the nature of septa, or, at most, mere rudiments of 

 such. All the corallites may be like one another, or the 

 corallum may be composed of two distinct and differing sets 

 of tubes. 



The ChcBtetidiE were regarded by Milne- Edwards and 

 Haime as a " tribe " of the Favositidce, and the genera Chcstetes, 

 Fischer, Dania, E. and H., Stenopora, Lonsd., and Constellaria, 

 Dana, were regarded as constituting this division (Brit. Foss. 

 Cor. Introduction, p. Ixi, 1850). Monticzclipora, D'Orb., was 

 originally included by Edwards and Haime under Chcstetes, 

 but they subsequently admitted its generic distinctness (Brit. 

 Foss. Con, p. 264, Note, 1854). The genus Fistidipora, 

 M'Coy, on the other hand, was placed by the French observers 

 in the family of the Millcporidce, in the immediate neighbour- 

 hood of Heliolites. In their great work, the ' Polypiers 

 Fossiles des Terrains Palseozoiques,' Milne - Edwards and 

 Haime established the three additional genera Beaumojitiay 

 Dekayia, and Labeckia, which they placed in the Chcstetince ; 



