38 A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 



12. M. concinna, n sp. PI. V., fig. 4 



Zoarium bilaminate. Zocecia irregular in shape, rounded above, separated by 

 thick, raised, strongly-granulated margins, surmounted by a narrow smooth raised 

 line and descending abruptly to the flat granular lamina; aperture occurring about 

 one-fifth of the area, extending laterally to the margins, the lower edge straight or 

 with a slight sinus at each angle ; avicularian cells intercalated among the zooecia, 

 granular, the triangular mandible directed upwards. 



S.P. 



Distinguished by the abruptness with which the margins descend to the broad, 

 nearly flat, granular lamina, and the width of the aperture which extends quite to 

 the margins. 



13. M. delicatula, Busk. PL V., fig. 5. 



Biflustra delicatula, Busk, Crag Polyzoa, p. 72 ; McG., P.Z.V., 57 ; Mem- 

 branipora delicatula, Hincks, A.M.N. EL, July, 1880; M. savartii, Waters, Q.J.G.S., 

 1885, p. 286. 



Zoarium bilaminate. Zocecia quadrate but bulging on the sides ; margins 

 granular ; a granular lamina filling part of the area below ; aperture rounded or 

 elliptical, occupying three-fourths of the area. 



B. Living. Australia. 



Var. acicidata, McG. PI. V., fig. 9. 



Biflustra acicidata, McG., T.R.S.V., Nov., 1890. 



Having a row of very minute acicular denticles projecting inwards from the 

 edge of the aperture. 



M.C. Living. Port Jackson. 



14. M. savartii. PI. V., figs. 6, 7. 



Biflustra savartii, McG., T.ll.S.V., Nov., 1890 ; ? Membrawvpora trifolium, 

 var. minor, Hincks, A.M.N.H., July, 1880. 



Zoarium encrusting. Zooecia ovate or elliptical; area partly filled in by a 

 sloping, finely- granular narrow lamina; aperture elliptical, occupying the greater 

 part of the area ; zocecia extending slightly below the area ; small avicularia, with 

 the mandibles directed upwards, generally placed on each side of the base of a 

 zoceciuni. 



M.C Living. Australia. 



