Tertiary Polyzoa of Victoria. 21 



part of the thyrostome, but by tilting it longitudinally at an 

 angle of 45° it is seen as shown at Fig. Sa. The true character 

 of the rostrum can only be seen when viewing it from the side, 

 and Fig. 8;^ shows its appearance in this position ; it is only 

 magnified about half as much as the other figures. There ai-e 

 traces of a few spines on the distal margin of the thyrostome. 



Mucponeila conica, n. sp. (PI. I., Fig. 9). 



Zooecia elongated ; surface convex, covered with rather large 

 ^ores. Thyrostome orbicular, with a pointed median denticle 

 and two lateral ones. Peristome thickened and developed 

 proximally into a large thick, obtuse, conical mucro. 



Locality.— F\\tev Quarries (T. S. Hall). 



This is allied to M. proboscoides, but the zooecia are smaller, 

 convex and perforated with large pores ; the peristome is 

 thickened, the conical mucro is much broader in proportion to 

 its length, the median denticle in the throstome is small and 

 acute (Fig. 9^), and there are no traces of spines. 



Popella angustata, n. sp. (PI. I., Fig. 10). 



Zoarium encrusting. Zooecia very small and narrow, smooth, 

 with raised margins, two pores near the base of the cell. 

 Thyrostome orbicular, with a small acute mucro on the proximal 

 margin, and a small aviculai'ium below it on or within the 

 peristome, which is raised in that part. 



Locality. — Mitchell River (J. Dennant). 



A single specimen. This is one of those species which are 

 difficult to place generically ; the mucro would place it in Mucro- 

 nella, but the small avicularium being within the external 

 margin of the peristome, I place it in Porella. 



MucPonella irregularis, n. sp. (PI. II., Fig. 11). 



Zoarium encrusting. Zooecia irregular in shape ; surface rugose, 

 ■with raised ridges in places. Thyrostome transversely elliptical, 

 with a small pointed mucro in the proximal margin, with a small 



