A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 93 



3. S. cribraria, McG. PL XII., figs, 16, 17. 



Smittia cribraria, McG., T.RS.V., 1885. 



Zoarium encrusting. Zooecia large, separated by narrow raised lines, slightly 

 convex ; surface with close-set rather large pores or deep pits ; thyrostome large, 

 with a round avicularium with the peristome below, in front of a large denticle. 



M.O. 



4. S. ordinata, n.sp. PI. XII., figs. 18, 19. 



Zocecia ovate, alternate, in longitudinal series, separated laterally by deep 

 furrows at the bottom of which is a narrow raised line from which branches extend 

 to the middle of the thyrostomes ; surface with numerous round pores ; thyrostome 

 somewhat pyriform with a rounded sinus below; a quadrate median denticle, having 

 in front a small avicularium within the lower edge of the peristome. Ocecia small, 

 rounded, subimmersed in the zooecium above. 



S.P.; M.C.; M. 



5. S. reticulata, J. McGh, sp. PL XII., figs. 20, 21. 



Lepralia reticulata, Busk, B.M.C., II., 66 ; Smittia reticulata, Hincks, 

 B.M.P., 316. 



Zoarium crustaceous or unilaminate. Zocecia elongated, separated by narrow 

 raised lines with a row of large areolse round the margins ; surface smooth ; 

 thyrostome subcircular, with a quadrate median denticle and a small sharp one on 

 each side ; secondary orifice with a rather narrow and pointed or rounded sinus ; 

 several spines on the upper edge of the thyrostome; below the lower lip an 

 avicularium with the long triangular mandible directed straight downwards. 



Var. calceolus, McG., T.R.S.V., July, 1886. Ocecium much elongated, 

 prominent, and frequently with a depression across the middle ; its surface punctate 

 with small or bordered pores, sometimes with a narrow smooth rim. 



S.P. ; M.C. ; M. Living. Europe, Australia. 



Var. nitida. Zocecia narrower and more prominent ; an avicularium, usually 

 spatulate and of unequal sizes, on each side below the lower lip. 



B. 



In the well-known living European form the ocecia are semicircular and 

 globose, prominent and punctured. In the usual living Australian form, as well as 

 in the fossil, they are of the calceolus form, as shewn in fig. 21. 



