Uiitopora and its Allies, H'-i 



Sp/Kpropliora fussn, 1 1 :i>« « rl 1 . 

 {in. VI. ligs. 1-3; U'Xt-li-. 2, a.) 



Si>]i(rntjihft)a foaaa, llas>n°ull, '* I'oly. from (^lU'i-ii.slniid Coast/" I'ltu-. 

 I.iiiii. ^>;oL•." N.S. Wales, vol. v. y. 12, \A. iii. liirs. /), <} (^IM.-Kt) ; 

 " Note on a Curious liitttaiice of J5viiibiu.sis," op. cit. vol. vii. p. ('08 



i'ellepora fossa, Watcw, " Foss. Clu-ii. Hrv. S. W. Australia," Quart. 



Jouru. tu'ol. .Soc. vol. x.wvii. p. ^4.'$, pi. xviii. lij;. b!» (1881); op. 



cit. Vol. xxwiii. p. iTo (IS^li); up. rit. vol. xxxix. p. 4l'<> t IHk;) ; 



op cit. vo!. xli. p. 3(»7, fi;.'. ti {\6^-'))\ -MacCiillivray, "'IVrt. I'oly. of 



\ iotoria," 'i ran.-*. If. .Soc. Nict. vol. iv. p. lOS, tijr.s. 8, !», 10 (l^it^>) ; 



Mnplfstont', "Tab. IJ.st Clicil. Poly, in Vict. Tert.," I'roc. IJ. 8oo. 



Viit.' vol. x\ii. n. s. p. '2l'> (I'JUl); "Ni'W or Litlle-knowu I'oly.," 



I'roc. Iv. S. \'ict. u. .". vol. xxv. p. .'{iil (li)13). 

 ? CvUejivra tuhulusa, l?Usk. 



On ir-cxjimination of tlie fossil specimen from Ciii'dics 

 ('reck, I tiiul tliat the grontli connncnces on the p;irt. 

 ()l>|)<)site to the pit, it then ijrous over to the nnder-ick*, in 

 which tlie |.it is .simated, Ji nio(h* of jjjrowtli wliieh we have 

 seen ocenrs in l{eu.>s's JJijjIoiaa i.s, so that when we nw' 

 h»wkin;i; at the pit it is at the eoniph.'tion not tlie hejjinnin;; 

 of the zoarinni. A simihii- })it, thoiiiih much smaller, has 

 hren dcserihed as the " primordial Zeile " in Bctopora and 

 olh(>r j^cnera (see paj^e 80). 



Ilaswell descrihcd the zoarinm as sul)S]:crieal, sli«;]i!lv 

 depressed, with a c ircnlar pit at the upper pole, a desci-i|)ti( n 

 quite deseribing specimens from Uueensland, wliieh he 

 kindly sent to mc, as one side is somewhat flattened and the 

 pit is at the opposite [)ole ; hut in some fossils* from 15atc>- 

 loid or Miuldy Cnek the sniface with the pit is the Haiti r, 

 showing the zoou'cia directed to the pit (I'l. VI. fig. 1), ai.l 

 these are the hest pn served of any specimens^ recent or fossil, 

 examined i)y me. In these the jiit is 0*55 mm. in diameter, 

 and from Percy Island the six specimens have pits 0*8 mm., 

 ()*0 mm., 055 mm. In Bntopura muUiraJiata, Kss., the pits 

 are much smaller, heing 0*25-0"27 nun. from Ferraia di 

 Monte Hahlo, Miendola, Muntccehio Maggiore, and ^ al di 

 L'jute ; a \)\t in Orbitulijiura jx'tiolus measures 0*3(> mm. 



/talopoia was described as with a single "aufiecht stcheiide 

 Zelle." This so-called "primordial Zelie" also in Sji/ueru- 

 phora stands out surrounded by a border, and is much 

 laiger than any of the zocecial openings, but we must now 

 call it a pit and this is referred to on paj;<' 80. 'ihis reversal 

 of the posititm of the zotecia, though not (juitc; the same as 

 now known in ('onesc/itirtliina,\vt reminds us of that genus. 



♦ " Fosa. Cliil. IJiy. fnuu .Muddv Crcik," (^uart. Jouin. (Jcoi. JSoc. 

 Vol. xx.\ix. p. li»G (1883). 



