Tertiary Folyzoa of Victoria. 3 



Amphiblestrum cpassissimum, n. sp. (PL I., Fig. 7). 



Zoai'iura very robust, somewhat glomerate. Zooecia with very 

 thick cell walls, ovate ; margins of area broad, raised, slightly 

 concave on the surface ; in the dorsal wall there is on each side 

 a large perforation, and on the lower median portion a still 

 larger one; 2- 10 spines on distal margin. 



Locality. — Filter Quarries (T. S. Hall). 



This is a remarkably robust species, with thick smooth walls. 

 It is quite distinct from any other. Some of the zooecia are 

 truncate, with the distal and dorsal wall incurved, while others 

 are not truncated, but have the distal margin convex, with traces 

 of spines. In these the peculiar perforated structure of the 

 dorsal wall is not seen, save in one (the extreme left hand one), 

 in which one of the lateral perforations is visible, and in the 

 lowest one in the figure, in addition to the thickened distal 

 margin with spines, there is a semicircular structure with a row 

 of spines or perforations, which probably represents the front of 

 an ooecium, as, at the extreme proximal part, there is apparently 

 the remains of the distal portion of a zooecium. 



Amphiblestpum pobustum, n. sp. (PL I., Fig. 8). 



Zoarium cylindrical, branched dichotomously, robust. Zooecia 

 large, oval, four in lateral series ; surface smooth, a few spines 

 round the margin. 



Z^^rtZ/Vj'.— Filter Quarries (T. S. Hall). 



This also is a very robust species. The margins probably bore 

 spines all round, but the bases of a few only (in different positions) 

 are preserved. 



Amphiblestrum bispinosum, n. sp. (PL I., Fig. 9). 



'Zoarium in vincularia form, quadrate. Zooecia in single linear 

 series on each of the four faces, very large, quadrate, elongate ; 

 area oval or subquadrate, opesia subquadrate, narrower at distal 

 end ; a large pore on each side of the margin, near the distal end ; 

 whole surface minutely granular. 



Locality. — Mitchell River (J. Dennant). 



This is a very large- celled species; the pore on each side of 

 the opesia may represent either a small avicularium or, more 

 probably, the base of a large spine. 



