54 A MONOGRAPH OF THE TERTIARY POLYZOA OE VICTORIA. 



or a fourth part of the area, with the tubular opening for the polypide situated to 

 one side. 



M.C. 



This species is readily distinguished by the long nearly tubular polypide opening 

 being situated to one side. At the bottom of the opesia, in front of the tubular 

 orifice, are two rounded openings, possibly communication pores. The specimens are 

 all in a single layer, but have probably been bilaminate. 



4. S. patula, Waters, PL VI., figs. 19, 20. 



Microflora patula, Waters, Q.J.Gr.S., 1881, p. 326; Steganoporella patula, I.e., 

 1882, p. 265. 



Zoarium broadly ligulate, bilaminate. Zooecia in regular linear series, much 

 elongated, quadrate, the lateral margins distinct and crenulate ; lamina depressed 

 anteriorly, finely granular and perforated ; opesia occupying about a fifth of the 

 area, having on the sides and above a thick beaded rim strongly projecting above 

 and cucullate ; from the inferior edge of the opesia a smooth calcareous plate curving 

 forwards and backwards and with a small round opening on each side. Ocecia taking 

 the place of zooecia, broad, flat, granular on the surface and opening into the 

 zooecium below. Avicularia on special tracts encroaching on the base of one 

 zooecium at a bifurcation, and on the corresponding side of the preceding zooecium 

 in the series. 



S.P.; M.C. 



In the specimen from which figure 20 is taken there are three ocecia, One 

 is similar to that figured, and another is mitriform. 



Family Microporid^e. 



Zoarium encrusting, or erect and uni- or bilaminate. Zooecia with distinct, 

 raised margins ; front depressed, calcareous, usually covered by a thick epitheca ; 

 operculum complete. 



Macropora, n.g 



Zoarium unilaminate and encrusting or bilaminate. Zooecia large, broad, front 

 entirely calcareous ; thyrostome raised, semicircular or nearly so, not reaching the 

 margins ; jieristome thickened. 



I propose this genus for the reception of two species, which it seems to me 

 ought to be included in the Microporidce. It differs from Micropora in the thicker 

 calcareous front wall and the thickened raised peristome. Waters includes 



