ON FOSSIL rOLYZOA. 



^421 



IV. 



115. MoNOPOKKM-\ oiiLONaA, Watot'H, 'Quart. Jour. Geol. Soc' vol. 



xxxviii., p. 271, pi. vii. fig. d. 

 Jftwgc. — Mioconc, AuHtralia (Wau-rs). 



116. MoNOl'(tiii;t,i,A si:\ANt;ir,Ai;:s, (joltlf. =: Eschnrn ihid., lln<fenow, 



' Maostr. Krcid,' jt. Hi, pi. x. tigH, Ili.') =: Ksr/mra (Jlarh'l, 'V. 

 Wood.M, 'On some Tcit. An.stralian I'olyzon,' A(!.= Monnpoi-fUd 

 srjuiiijuhiriti, Waters, ' C^uait. Juur. (Jeol. Soc' vol. \xxix. p. 

 435. 

 Tlanrje. — Cretaceous, ^lacstricht (Hagenovv) ; ^Miocene, Australia 

 (Waters). 



117. ^[oNd'OUKLl-A AMilCANS, Hincks, ' Coiitrlb. towards (ion. Hist, of 

 Alar. Poly.," Ann. :\Iafj. Nat. Hist.' IVI). l.sSi>, ser. .'., vol. ix. p. 

 1'2:{, pi. V. figs. .'>, r>ii, .'")b = CflU'pora nlhlcdiiti, Water.s, 'Quart. 

 Jour. Geol. Soc.' vol. xxxviii., p. ol'J. 



Ttuvge. — Miocene, liairnsdalc, Australia (Waters) ; Living, Australian 

 seas (Hincks). 



In certain remarks on the above species Air. Waters saya (/oc. cH. p. 

 512), ' I liavo already imintcdout that Cvllepora sdnluiiica, Watei'.s (" Bay 

 of Nap. liry./' A. M. N. H. March lH7i>, p. I'.Mi) ; C. Ynrracnsis, W. ; 

 C. intermedia, MacG ; C. ciiiii2)rcii8it, liusk ; and C fossa, llasw., should 

 be formed into a s>ib-g{ inis ; and the present form should bo added to 

 the list. I am not, however, inclined to think that they will ultimately 

 find their place with Mimoiiori'lln, Hincks.' These forms, as Mr. Waters 

 is inclino<l to leave them with Cilh'jxiva ])rovisionalIy, will bo found 

 further on. This form alter due consideration I place in the genus 

 MoHa)iorclla. Mr. Hincks describes other forms besides the one given, 

 but of which I have no fi^ssil record. M'lnoiwrdla was originally placed 

 as ]Ia})hi}tordla in the family Mirroporclllda'. 



I'^amily XIII. I'oiuxiD.i: (part), D'Orbigny. 

 Memhmiiij^iorido', (part) Busk; Escharoporihv, (part) Smitt. 



' Zoariitm incrnsting, or erect and ramified. Zoacia with a raised 

 tubular or subtubular oritice, and frequently a sjjecial pore on the front 

 wall.'— Hincks, p. 220. 



In the absence of the special pore, and also the ovicell, it would be 

 very easy to mistake fossil specimens of I'orina iiibuhimi for Dlastopora, 

 or even liidlastujiani — but the .special characters ought to be sufticient to 

 keep the genera distinct ; and although I have met with fossil si)ccimens, 

 which I place fcarle.s.sly with Jh'axtdpont, yet in some of the zooocia there 

 ai'C faintly indicative structural peculiarities that cannot be accepted as 

 normal features of Cyclostomatous Polyzoa. These, however, should bo 

 closely studied and noted. In some of the Torinuhv described by Air. 

 Waters, the characters are still very diflicult to understand or identify ; 

 yet, notwithstanding the apparent anomaly in his synonyms, I think that 

 we cannot but be thankful to him for the labours he has bestowed upon 

 the group, especially so when we look over synonymous genera given 

 below from Hincks. 



Genus PoraNA, D'Orbigny. 



Eschara, (part) auctt. ; Bidiastopora, (part) D'Orb. ; Pustulipora, 

 (part^ Sars ; Lcpralia, (part) Busk ; Oachopiora, (part) Busk ; Quadri- 



