208 A Catalogue of the 



Micropora, Hinclcs. 



Zooecia with the lower edge of the mouth thickened by a cal- 

 careous band ; oral spines, when present, slender and articulated. 

 Avicularia at the base of the zooecia. Ooecia external, prominent. 



M. perforata, M^G, P.Z.V., 25, 36. 



M. COriacea, Esper sp. B.M.C., Part II., p. 57 ; B.M.P., p. 174. 

 Var. angUSta, M^G. T.R.S.V., July, 1886. 



Family. Steganopoeellid^. 



Zoarium encrusting or free and uni- or bilaminate. Zooecia quad- 

 rate, arched above, separated by thick calcareous margins ; divided 

 into two chambers, an upper closed by the thick epitheca, and a 

 lower separated by a perforated calcareous lamina and opening 

 anteriorly by a tubular orifice. Ooecia altered zooecia. 



Steganoporella, Smitt. 

 The only genus. 

 S. magnilabris, Bush sp. B.M.C., Part II., p. 62 ; P.Z.V., 60 ; 

 C.P., p. 75. 



Family. Ceibrilinid^e. 



Zoarium encrusting or erect, foliaceous, and unilaminar. Zooecia 

 contiguous or disjunct j front occupied by a series of ribs converging 

 to a median line, and separated by grooves, which are either closed 

 or perforated ; or with variously arranged large, rounded, smooth- 

 edged foramina. 



Membraniporella, Smitt. 



Zoarium adnate or foliaceous. Zooecia contiguous or disjunct ; 

 front closed by a series of flattened, more or less consolidated, cal- 

 careous ribs. 



M. distans, M^G. T.R.S.7., July, 1882. 

 Cribrilina, Gray. 



Zoarium encrusting, or adnate or erect. Front of zooecia with radiat- 

 ing furrows occupied by regular series of perforations, or irregularly 

 pierced by large, more or less rounded, foramina; mouth semicircu- 

 lar or suborbicular, entire below. 

 C. radiata, Moll sp. B.M.P., p. 185; C.P., p. 131. 

 0. setirostris, M^G. T.R.S.Y., Oct., 1882. 



Port Phillip Heads. 

 C. monoceros, JBusL B.M.C., Part IT., p. 72 ; P.Z.Y., 35. 

 0. acanthoceros, M^G. T.R.S.V., July, 1886. 

 Hiantopora, M'G. 



Zoarium loosely adnate, attached by radical fibres. Zooecia with 

 the anterior surface occupied by irregular, rounded foramina ; mouth 

 sub-triangular, one or more sharp, calcareous denticles on one side, 

 and on the lower edge of the peristome a large sessile avicularium, 

 with the mandible opening upwards. 



I 



