BUB-CLASS II 



ANTIIo/oA I1K\.\< <|;.\l.!..\ 





concerned in tin- fiiriiiatinii it" i! //<//,. //liojtliyllum, 



Oiii/ilti/iii", I'ti/i-lnifiliiflliiin, >'//-., ///*/ : .iiia, Auhirjihi/llniii, Cyxti- 



/ihl/lllllii. etc., <>f tlic T'fr'l'-","//'!, Koides llUIlleroi; 



and Kchinodernis. Tin- / f "<-0raUa arc not ma in tin- \> 



specially in the Middle and I n <>l the Kif.i 



;. Mar/.. I '.onlo^n,-. Kn.u'land. and Nort: .ndant 



here are the .u'eiiera 1'f/tith/iltyllinn, < V//M//I, 



. ,''/'// /V/I//X Anifil'-niji, Lift 



i, etc.. predominate in t he ( 'arlMHiifen.ii- I .inn-stone of B< ! : 



Ireland, and North . \nieii. -a ; while in tin- Xn h-tein the >n|ifary x'"U> i 



/. ( )n the other hand, the iVrnio ( '.u -I,,,,, . ,j the Salt 



L'aiiLTf in l-'arther India and of the i-l;iml Timor contain the -, 

 ./////</ /////////////. and L>,H/II/. \ h. the . 



(i'i<iinifi>.<fi/li.<, /'iiKtr,, ],/<,,//, mi, and Goecophytt\ ;IIL: in tl 



lielun^ to tin- '/''f>;i'-"i-'i/l'' ; and to this ^r-iuji al> ha\c been assigned //o/oryx/ix, 

 K. and II., from the Cretaceous, and the recent genera /A/y/oy,//////!//,-. 

 and ti'iii/nin, Duncan. A numlier of Palaeozoic Tetrawralla, such a / 



.lii/lli". and Sfnurin, are referred )>y Duncan and Nicholson to th<- 



Sub-Class 2. HEXACORALLA. HaeckeL 

 (Zoantharia, Blainville ; //..//////// and /V//</.Y/,,/,,, Klnvn berg.) 



'e or composite pvliij*, ">/// /w.AW ///<///, //<.< ///>//"/ in cyd* -' 

 es of si. r frjiii nf/i/ ii-'ifh riil/;i, 

 lint xiHiH-tiiiH'* jl.<h;i or with 





83957 2759S8 

 :10 :12: 15:18:1 4:17: 1C : 11 : 11:1:17:M JI:1 



To the HexaCOi'iiUii belong the calcareous 



buildiDg and deep-sea corals (.17 

 poraria) of the present day, the fleshy sea- 

 anemones (Ai-tiiiimi-i), and those forms 

 characterised by the secretion of a horny 

 axis (Jnti/Hifh'iri't). ( >f these three on 

 (jnly the MadnpOTQtia are kno\\-n in a fossil 

 These forms are di-t MIL: li-hed from 

 the T'trii'-nilln by the lu-xann-ral system 

 and radial arrangement of m- - and 



septa : and from tli> 100, in addition 



to the abore-named characters, by their 

 simjile tentacles. In the M-nlf /"n'ri". -i\g 

 oi- more rai'ely t\\el\e principal sej t;. spring 



from the l)a|e of the theca, and bet \\een 





ii 



these new septa originate in >udi manner 'i,'. 

 that all similarly situate.! mesenteries be ;;; 

 come simultaneously provided with an 



J ' 



130. 



Miln.-- K.lwnnU !>>! 

 i th- II, j- 



ti, 



;;;;;; 

 "" A 



.... . n . mark *e beginning m 



additional septum. The corallum, accord 



in.icly, consists of at least six, but usually j"'j{ ^.VlTut'..'^'!"'^!-'- ' 

 of a larger numl>er of septa, \\ hose disposi- 



tion is strictly radial. The six principal septa form the first cycle, and at the 

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