28 A MONOGRAPH 0¥ THE TERTIARY POLYZOA OF VICTORIA. 



projoctinti' downwards from the uppor margin ; lateral zoax'in more oliliqiic and 

 Avitli the outer part produced as a wing'-like expansion of tlie thin edge of the 

 zoarium. Avicularia on the extreme edge of th(! zoarium on separate areas replacing 

 zooecia, transversely linear or narniwly elliptical, jioiiited at each side and Avith the 

 margin thickened and tiucly crenulated ; fi'om eacli angle inlernally a slender, 

 acicular, calcareous denticle or spine extending horizonially iuAvards. 



S.F. ; M.C. ; f?. ; B.R. ; C.B. 



Waters describes and figures the avicularium as having an internal plate with 

 a sinus, hut this structure is in reality two intcnial nearly horizontal spines or sharp, 

 elongated denticles. In one specimen there is a longitudinal series of several zooicia 

 which are wider and have the thyrostome wider and shallower ; lurfortunately, the 

 nppcr part of all these zoa^cia is broken off, so that no pore, if such exists, is seen, 

 but they are almost certainly fertile. 



'I'hc genus Melicerita, as pro]iosed by Milne Edwards and adopted by Busk, 

 diifers only from Cellaria (^JSalicornaria) in having the zoarium com2)ressed instead 

 of being cylindrical as in the latter, a character obviously of no generic value. 



2. C. acutimm'ginata, n.sj). PL III., fig. 17. 



Branches conij)ressed, ligulate, bilaiuinate, with sharp edges. Zoa3eia alternate 

 in longitudinal series, hexagonal or rliomboidal, margins narrow, slightly raised, 

 siu'face dejiressed minutely granular ; thyrostome occupying the second fourth of 

 the length, large, arched above, nearly straight or slightly projecting below, with 

 two sharp denticles from the lower lip connected Ijy a slight plate, and two small 

 shnilar denticles from the upper edge. 



S.r.; M.C. 



Readily distinguished from the last species by the dilfereot arrangement of 

 the zotecia. 1 have not seen avicularia or ovai'ian pores. 



3. C. contigua, n.sp. PI. III., fig. 18. 



Cellaria maloincnsis, Waters, Q.J.G.S., 1881, p. 821. 



Branches cylindrical. Zorccia contiguous in longitudinal s(>rics, elongated, 

 usually hexagonal, margins raised ; surface considerably depressed, smooth or very 

 minutely granular; thyrostome lol'ty, lower lip bulging forwards and upAvards, Avith 

 two short, stout, sharp denticles. Avicularia intercalated between the zooccia 

 laterally, mandible long, acute, directed u])wards. 



S.P.; M.C; B.; B.li.; C.B.; Belm.; W.P. and C.C. (W.). 



