A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 43 



6. A. annulus, Manzoni, sp. PL VI., fig. 3. 



Membranipora annulus, Manzoui, Bryoz. Foss. Ital., 4a, cont., p. 7 ; id., Bryoz. 

 di Castacaro, 12; Waters, Q.J.G.S., 1887, p. 47; M. deirfata, Waters, Q.J.GLS., 

 1883, p. 263 ; ? M. gatelta, Busk, P.M.C., Pt. II., p. 62 ; id., Zool. Kerguelen 

 IsL, Phil. Tr. OLVIIL, 195. 



Zoariuin encrusting. Zooecia irregularly arranged, distinct, short and wide; 

 margins raised, the upper part thickened and projecting forwards, with four large 

 spines situated two on each side; area largely filled in by a depressed calcareous 

 lamina ; aperture large and nearly circular with a thickened annular rim ; a small 

 elliptical or pointed avicularium .surmounting the zooecia, and frequently one or two 

 at the base. 



M.C. ; B. ; M. Living, Falkland and Kerguelen Islands. 



Waters (Q.J.G.S.), 1887, p. 47) describes the ooecium as " widely open with a 

 raised line arching across the front, a short distance above the opening, enclosing a 

 narrow depressed area." 



7. A. cylindrlfonne, Waters, sp. PI. VI., fig. 2. 



Membranipora cylindriforme, Waters, Q.J.Gr.S., 1831, p. 323 ; id., 1882, p. 263. 



Zoarium small, cylindrical. Zooecia separated longitudinally by a small tract 

 which may be considered an extension of the cell downwards ; area broad below, 

 narrowed above, triangular, with the angles rounded ; lamina smooth or subgranular ; 

 aperture large, subcircular ; four spines above, of which the lateral are considerably 

 the larger ; an avicularium, with pointed mandible, directed upwards or occa- 

 sionally laterally, on a raised process at the apex of the zocecium ; another 

 avicularium, with the mandible directed transversely, on an elevation below the 

 area. 



S.P.; M.C; B.; M. ; C.C. (W.). 



8. A. occultatum, Waters, sp. PL V., fig. 15. 



Membranipora ocadtata, Waters, Q.J.G.S., 1887, p. 48. 



Zoarium encrusting. Zooecia quadrate ; aperture large, occupying about half 

 the area, lower edge straight, arched above, sides straight or slightly contracted 

 about the middle, granular; with age the sides and lower parts of the zooecia 

 elevated by a calcareous overgrowth, those of the contiguous zooecia coalescing and 

 becoming continuous so that the aperture appears to be deeply buried ; a small 

 rounded avicularium below or on one or both sides of the elevated portion. 



G2 



