ral- 



) 



vol. 



at tbo 

 t the 

 With 

 ; but 

 , atid 

 iatlij"', 

 L pores 



ON FOSSIL rOLYZOA. 



117 



1)2. CuinUTLlNA MONOCETvOS, Busk (iion Reuss) = Ze;;mZui ibid., Busk, 



P- 



(2 



Lepnilia ibid., MacGill., 



'Zool. Vict,* 

 '.]2 --=■ Crih'-ilina, Hincks, ' Proceed. Lit. & Phil. 

 Soc. Liverpool,' April, 1H81 ; ' Ann. 'Mag. Nat. Hist.,' Jaly, 1881. 

 Jtanfie. — Living : Bass's Straits. Fosril : Bairnsdale (Gippsland). 



'Mar. Poly.' 

 decade iv. p. 



Genus Mi:.mi!i;anii'ORi;lla (part), Smitt. 



Ijercnicca, (part) Flem. ; Lr^iraUa, (part) Johnston, Gray, Busk ; 

 Mcinhranipiira, {YAvi) Snaitt. 



' ZoariuDi incrusting, or rising into free foliaccous expansions, with a 

 single layer of cells. Zowcia closed in front by a number of flattened 

 calcareous ribs moro or less consolidated.' — Hincks, 100. 



03. Memhuanu'OHELla nitida, Johnst. (Hincks, p. 2U0) = Escharoides 



ibid., j\Iilue-Ed.=7it'm/i/t'i;a ibid., Flem. ; M. nitida, Waters. 



' Quart. Jour. Geol. Soc' vol. xxxix., p. 4;3G ; Lepralia cximia, 



Seguei'za, ' ije Form. Terz. R. Accad. dei Lincei ; (?) Fliophlcea 



sdrjcna, Gabb & Horn, Monogr. (Cret. Bry. New Jersey). The 



authors give the following synonyms for this species = Flustra 



sagena, Morton, ' Synopsis,' p. 70, pi. lo, fig. 7; Escharina ibid., 



Lons. 'Quart. Jour. Gtol. Soc' vol. i. p. 71; liepteschariyieAla 



ibid. D'Orb, ' Pal. Fr.' v. p. 420. 



liaiirje. — (?) Cretaceous, Timber Creek, New Jcr. ; Waurn Ponds, 



Australia (Waters) ; Zanclean Calabria (Seg.). Living: Northern Seas ; 



Capri, 225 fathoms (Waters) ; New Zealand (Hutton). 



Family XL MicuorOKELLiTt.i:, Hincks. 



Celhporidce, (part) Johnst. ; ^[emhrnniporidtp, (part) Busk ; Puriuidce 

 (part) D'Orb. ; EscJian'poridw, (part) Smitt. 



' Zixccia adnata and incrusting, or forming erect and foliated or 

 dendroid zoaria ; orifice more or less semicircular, with the lower margin 

 entire; a semilunate or circular pore on the front wall.' — Hincks, p. 204. 



This important family group is founded upon well-marked structural 

 features, one of which is the ' semilunate or circular pore,' in the front 

 wall, given in the diagnosis. Mr. Hincks indeed says, ' Wo do not know 

 the physiological import of this detinitely shaped ojiening .... but 

 the character which is constant may be fairly accounted of considerablo 

 importance, and taken in combination with the form of the apertui-e is a 

 good diagnostic mark,' (/. c. p. 2Uo). Further particulars of this mark 

 arc given by Mr. Waters (' Quart. Jour. Geol. Soc' vol. xxxvii., p. 313), 

 Ho says, ' In studying both recent and fossil forms, I have often been 

 impressed with the frequency with which open pores are replaced by 

 avicularia, and think that it is a matter worthy of most careful examin- 

 ation.' Mr. Waters says, however, that the 'genus MicroporeJIa must be 

 extended ; for we are able to trace relationship from M. rinhicra with a 

 round pore to the vnvicty Jissa with an elongated pore (tig. 7'S). Then 

 we have M. Yarranensis with two or three denticulated pores in the 

 depression, and, in this way on by ^f. rosrinopora and var. ai-mata to 

 M. symmctfii'd (fig. 83).' The fossil Microporellidic are well represented 

 in the Australian deposits, and the necessarily reduced number of generic 

 features in the group has increased the number of synonymous names ; 

 but in spite of this, the three genera which Mr. Hincks includes in the 

 family, in his ' Brit. Marine Polyzoa,' are well marked and easily 

 identified. 



