of the AntJiozoa Tahulata. 15 



fluted by pseuclo-costae. As in Syringopora^ a pair of diver- 

 ging stolons shoot out from the lip of the affixed surface. 

 These are converted into new corallites, but after attaining 

 a certain size become detached from their parent ; so that a 

 compound colony is never produced. In Litltostrotion^ e. g. 

 in L. irregulare and L. harmodites (in which true connecting- 

 tubes are present), similar expansions may give rise to new 

 corallites. In some [Litliostrotion ccespitosmn^ Mart., De 

 Koninck, An. Foss. 1872, pi. ii. fig. 2) they were very 

 short, and are seen as knobs on the surface of the corallum. 

 In DiphyphyUum the large hooked processes are most nume- 

 rous, and either coalesce with other corallites, or abut on their 

 epitheca without actual fusion. Often new corallites which 

 grow erect, and thus enlarge the corallum, are produced out of 

 these processes (Edw. & Haime, Pol. Foss. des Terr. Pal. 

 pi. X. fig. 4). It is assumed by various authors that such 

 calicular expansions are only prolongations of the epitheca, 

 and that they are formed of this. These rootlets, however, 

 were in many genera clearly formed only when the corallum 

 was young J and hence they are only found round its lower 

 extremity. In others (as Litliostrotion^ Diphyjihyllumj and 

 Syringopora) they continued to be formed during life. By 

 sections it can be readily shown that the rootlets are in imme- 

 diate connexion with the interior calicular walls of the coral, 

 and that they themselves are not only covered by the epitheca, 

 but are also provided with endothecal dissepiments. In Nodit- 

 lipora acuminata this outflow (of rootlets) takes its origin from 

 several corallites in common, and has the form of reclined root- 

 like processes, from which corallites are budded forth and form 

 a new colony at the side of the former. 



From what I have here stated concerning the internal 

 structure and mode of propagation of Syringopora^ it seems to 

 me evident that its systematic place should be rather in the 

 vicinity of Lithostrotion and DiphyphyUum than of the Favo- 

 sitidge (as proposed by Duncan), or of Halysites (as placed by 

 M.-Edwards). 



As a summary of the above statements, I append a list of 

 the genera which constitute the order of the Zoantharia Tabu- 

 lata of M.-Edwards and Haime, with remarks on what I hold 

 to be their natural place in the zoological system : — 



Name of Genus. To be removed to 



Millepora. Hydrozoa ? 



Heliopora. Alcyonaria (Moseley). 



Polytr-emacis. Alcyonaria. 



Jfeliolite.t. Heliolitidfe (special family). 



Fistulipora. Some species to Ileliolites ; others 



to the Bryozoa. 



