20 Proceedings of the Royal Society of Victoria. 



Popella otwayensis, n. sp. (PI. I., Fig. 6). 



Zooecia small, elongated ; surface covered with pores. Thyros- 

 tome orbicular, with a small sinus below, in which is a small 

 avicularium ; margin thickened and raised. Ooecia globular, 

 subimmersed, with a small circular depressed area in front 

 minutely punctured. 



Locality. — Cape Otway (J. Dennant). 



This is a curious little species. The surface is covered with 

 large pores, the dividing line between the zooecia is scarcely 

 discernible, the thyrostome is thickened and raised, more 

 especially in the fertile zooecia and in them with the ooecia form 

 a pyriform elevation. The ooecia have a round perforated area 

 and are curiously like those of Shizoporella ambita Waters. 



Popella dennanti, n. sp. (PI. I., Fig. 7). 



Zoarium encrusting. Zooecia obscurely hexagonal, flat, with a 

 more or less regular row of large pores round the margin ; 

 margins slightly raised. Thyrostome orbicular, with a wide 

 sinus in the lower part, within which is a small avicularium. 

 Ooecia large, globular and partly immersed. 



Locality. — Mitchell River (J. Dennant). 



A single specimen, but clearly distinct from any described 

 species ; the nearest to it is Porella ordinata (Smittia ordinata,. 

 McG.). 



Mucronella ppoboscoides, n. sp. (PI. I., Fig. 8). 



Zooecia very large, elongated, quadrate ; surface nearly flat, 

 covered with small pores. Thyrostome orbicular, with a broad 

 square denticle (lyrula) in the middle of proximal margin and a 

 small pointed one (cardella) on each side. An enormous elon- 

 gated mucro or rostrum immediately below the thyrostome, 

 projecting at nearly a right angle to the surface. 



Z^ra//0'.— Griffins, Moorabool (T. S. Hall). 



A single specimen consisting of one zooecium only. In the 

 front view the enormous rostrum, or mucro, hides the proximal 



