Marine Polyzoa of Victoria. 207 



tially filled in below and occasionally on the sides, by a calcareous, 



usually granulated, lamina, which generally slopes downwards from 



the margins. 



B. delicatula, Busk. RZ.V., 57. 



B. perfragilis, J\PG. P.Z.Y., 57. 



? B. Lacroixii, Aud. sp. B.M.C., Part II., p. 60 ; B.M.C., p. 129 ; 



P.Z.V., 26. 

 B. papulifera, M^G. P.Z.V., 106. 



Port Phillip Heads, J.B.W. 



B. bimamillata, M^G. P.Z.V., 106. 

 Portland, CM. 



Caleschara, M^G. 



Zoarium encrusting, or erect, and uni- or bilaminate. Zooecia 

 separated by distinct, raised, calcareous margins ; front covered by 

 a thick epitheca, beneath which the calcareous front wall is bevelled 

 to the depressed centre ; on each side of the calcareous front is a 

 longitudinal fissure, and across the upper part a thickened bar, 

 leaving a membranous portion above containing the mouth, the 

 operculum of which is incomplete. Ooecia altered and expanded 

 zooecia. 



0. denticulata, M^G. P.Z.V., 48; C.P., p. 76. 



Family. Microporid^. 



Zoarium encrusting or free and unilaminar. Zooecia quadrate, 

 separated by distinct, thick, raised margins ; front depressed, cal- 

 careous, beneath a thick epitheca ; operculum complete. 



Thairopora, M'G. 

 ( = Membranipora in part.) 

 Zooecia quadrate, in transverse and linear series ; surface uniform, 

 but the sub-epithecal, calcareous lamina sometimes with a transverse 

 fissure ; chamber single ; mouth straight ; a stout, erect, un- 

 articulated process on each side above. Avicularia replacing 

 zocecia. 



T. dispar, M^G. P.Z.V., 26. 

 T. Woodsii, M^G. P.Z.V., 26. 

 T. mamillaris, Lamh. P.Z.V., 26. 

 T. armata, M'G. T.R.S.Y., 1881. 



T. Jervoisii, Hmcks sp. T.R.S.Y., July, 1886. 

 Sorrento, Rev. Dr. Porter. 



Diploporella, if' G. 



Zocecia quadrate, divided into two parts, the anterior depressed, 

 the posterior forming a box-like elevation ; surface beneath the 

 epitheca calcareous, perforated, and in the anterior portion with 

 a transverse fissure ; a stout, hollow, unarticulated, calcareous 

 process on each side of the mouth. Avicularia replacing zocecia. 



D. Cincta, Hutton sp. T.R.S.V., April, 1880. 



