FA VOSITIDAL. 



35 



the Syringoporida. The genus Romingeria, Nich. (= Quenstedtia, 

 Rom.), is, again, curiously transitional between the Favositidce 

 and the Auloporidce, having the mural pores of the former 

 combined with corallites of the general type of the latter. 

 Lastly, the genus Nyctopora, Nich., affords a link between the 

 Favositidte on the one hand, and the apparently Aporose 

 group of the Columnariadce on the other hand. 



The following is a list of the genera which I include under 

 the Favositida, with the geological distribution of each. It 

 must be remembered, however, that two or three of these types 

 are at present imperfectly understood, and may prove to have 

 different affinities ; while two or three might with almost equal 

 propriety be included in the family of the Poritidce ; and future 

 researches will doubtless show that other generic forms will 

 have to be added to the list : 



Genus. 



Favosites, Lam., 

 Alveolites, Lam., . 

 Vermipora, Hall, . 



Michetinia, De Kon., . 



Pleurodictyum, Goldf., . 

 Chonostegites, E. and H. (- ) 



Haimeophyttum,tih,\ } 



Pachypora, Lindstr., 

 Striatopora, Hall, . 

 Trachypora, E. and H. (with 



Dendropora, Mich., and 



Rhabdopora, M'Coy), 

 Ccenites, Eichw., . 

 Columnopora, Nich., 

 Koninckia, E. and H. . 

 Favositipora, Sav. Kent (? ) 



Poritidcz), ) 



Arczopora, Nich. and Eth. ) 



Jun. (? PoritidcE), } 



Rosmeria, E. and H. (? Syr- 



ingoporidce), J 



Syringolites, Hinde, 

 Nyctopora, Nich., . 



Geological range. 

 . Silurian to Carboniferous. 

 . Silurian and Devonian. 

 . Silurian and Devonian. 



t Upper Silurian (?), Devonian and 

 J Carboniferous (perhaps = Pleuro- 



( dtctyum, Goldf.) 

 . Upper Silurian ? and Devonian. 



. Devonian. 



. Upper Silurian and Devonian. 

 . Upper Silurian and Devonian. 



. Devonian and Carboniferous. 



. Silurian and Devonian. 

 . Silurian. 

 . Cretaceous. 



. Recent. 

 . Devonian. 



. Devonian. 



. Upper Silurian. 

 Lower Silurian. 



I 



