ON FOSSIL POLTZOA. 121 



115. Monoporella oblonga, Waters, 'Quart. Jour. Geol. Soc.' vol. 



xxxviii., p. 271, pi. vii. fig. 9. 

 "Range. — Miocene, Australia (Waters). 



116. Monoporella sexangularis, Goldf. = EscJiara ibid., Hagenow, 



'Maestr. Kreid,' p. 81, pi. x. figs, 345 = Eschara Clarlcei, T. 

 Woods, 'On some Tert. Australian Polyzoa,' &c.= Monoporella 

 sexangularis, Waters, ' Quart. Jour. Geol. Soc' vol. xxxix. p. 

 435. 

 Range. — Cretaceous, Maestricht (Hagenow) ; Miocene, Aush*alia 

 (Waters). 



117. Monoporella albicans, Hincks, ' Contrib. towards Gen. Hist, of 



Mar. Poly.,' 'Ann. Mag. Nat. Hist.' Feb. 1882, ser. 5, vol. ix. p. 



123, pi. v. figs. 5, 5a, 5b = Cellepora albicans, Waters, ' Quart. 



Jour. Geol. Soc' vol. xxxviii., p. 512. 

 Range. — Miocene, Bairnsdale, Australia (Waters) ; Living, Australian 

 seas (Hincks). 



In certain remarks on tbe above species Mr. Waters says (loc. cit. p. 

 512), ' I have already pointed ont that Cellepora sardonica, Waters ("Bay 

 of Nap. Bry.," A. M. N. H. March 1879, p. 196) ; C. Yarraensis, W. ; 

 C. intermedia, MacG ; C. compressa, Busk ; and C. fossa, Hasw., should 

 be formed into a sub-genus ; and the present form should be added to 

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

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

 is inclined to leave them with Cellepora provisionally, will be found 

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

 Monoporella. Mr. Hincks describes other forms besides tbe one given, 

 but of which I have no fossil record. Monoporella was originally placed 

 as Haploporella in the family Microporellidce. 



Family XIII. Porinidj; (part), D'Orbigny. 

 Membraniporida?, (part) Busk ; Escharoporidce, (part) Smitt. 



' Zoarium incrusting, or erect and ramified. Zooicia with a raised 

 tubular or snbtubular orifice, and frequently a special pore on the front 

 wall.'— Hincks, p. 226. 



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

 very easy to mistake fossil specimens of Porina lubulosa for Biastopora, 

 or even Bidiastopora — but the special characters ought to be sufficient to 

 keep the genera distinct ; and although I have met with fossil specimens, 

 which I place fearlessly with Biastopora, yet in some of the zocecia there 

 are faintly indicative structural peculiarities that cannot be accepted as 

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

 closely studied and noted. In some of the PorinidcB described by Mr. 

 Waters, the characters are still very difficult 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 Porina, D'Orbigny. 



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

 (part) Sars ; Bepralia, (part) Busk ; Onchopora, (part) Bask ; Quadri- 



