26 . THE GENUS iMONTICULIPORA. 



he identifies with Trciuatopora, Hall. I am not aware that 

 any of the original types ascribed by Hall to Treniatopora 

 (Pal. N. Y., vol. ii. p. 149 ct scq) have as yet been investigated 

 by means of modern methods, or that such Investigations, 

 at any rate, have up to this date been made public. In the 

 absence of this essential preliminary, it seems impossible to 

 decide whether or not Treniatopora, Dyb., is identical with 

 Tre7natopora, Hall. The forms included by Dybowski under 

 this title appear, however, to constitute a peculiar group of 

 Monticuliporoids, and I shall defer their more full considera- 

 tion to an appendix at the end of this work. 



The ninth genus of Dybowski's system is one which is 

 founded for the first time under the name of Ditfopora. This 

 also appears, like the preceding, to embrace a peculiar group of 

 Monticuliporoids ; and I shall similarly consider its characters 

 in an appendix, as I am personally unacquainted with any 

 types that I could refer to it. 



Finally, Dr Dybowski includes amongst the Monticulipor- 

 oids the extraordinary genus Labcc/iia, E. and H. If, how- 

 ever, this type really has any genetic relation with the Mon- 

 ticuliporoids, as is very dubious, such relation cannot be a 

 close one ; and the genus is certainly the representative of a 

 special family (see Pal. Tab. Cor., p. 330). On the other hand, 

 there is the high authority of Dr Steinmann (Ueber die fossile 

 Hydrozoen aus der Familie der Coryniden : Palseontographica) 

 in favour of the view that Labcchia, E. and H., truly belongs 

 to the Hydractiniidc€. 



In 1877, a peculiar type of Monticuliporoid was described 

 by Mr R. Etheridge, jun., and myself under the name of 

 Prasopora (Ann. Nat. Hist., ser. 4, vol. xx. p. 38). 

 1S77 con- \Yg regarded this at first as a distinct oenus ; but I 

 have since examined other allied types, and I am 

 now disposed to regard it as a section or sub-genus of JMonti- 

 culipora, D'Orb. Its distinctive characters will be fully treated 

 of subsequently. 



