28 A MONOGRAPH OP THE TERTIARY POLYZOA OF VICTORIA. 



projecting downwards from the upper margin; lateral zocecia more oblique and 

 with the outer part produced as a wing-like expansion of the thin edge of the 

 zoarium. Avicularia on the extreme edge of the zoarium on separate areas replacing 

 zooecia, transversely linear or narrowly elliptical, pointed at each side and with the 

 margin thickened and finely crenulated ; from each angle internally a slender, 

 acicular, calcareous denticle or spine extending horizontally inwards. 



S.P. ; M.O. ; B. ; B.R. ; O.B. 



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

 a sinus, but this structure is in reality two internal nearly horizontal spines or sharp, 

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

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

 upper part of all these zooecia is broken off, so that no pore, if such exists, is seen, 

 but they are almost certainly fertile. 



The genus Melicerita, as proposed by Milne Edwards and adopted by Busk, 

 differs only from Cellaria ( = Salicornaria) in having the zoarium compressed instead 

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



2. C. acutimarginata, n.sp. PL III., fig. 17. 



Branches compressed, ligulate, bilaminate, with sharp edges. Zooecia alternate 

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

 surface dejaressed 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 by a slight plate, and two small 

 similar denticles from the upper edge. 



S.P.; M.C. 



Readily distinguished from the last species by the different arrangement of 

 the zooecia. I have not seen avicularia or ovarian pores. 



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



Cellaria malvinensis, Waters, Q.J.G.S., 1881, p. 321. 



Branches cylindrical. Zooecia contiguous in longitudinal series, elongated, 

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

 minutely granular ; thyrostome lofty, lower lip bulging forwards and upwards, with 

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

 laterally, mandible long, acute, directed upwards. 



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



