Tertiary Polyzoa of Victoria. 141 



ter does not appear in my specimen of it, or in D. pyriformis ; 

 the front wall of the zooecial cells has no foramen, and the peris- 

 tome of A. triton is simply a slightly thickened margin, and in, 

 D. pyriformis it is almost imperceptible. Therefore, the zooecial 

 cells in both these species being without a foramen, I do not 

 consider they can i-ightly be placed in Adeonella, or that they 

 belong to the Adeoneae, though closely allied. 



Dimorphocella pyrifopmis, n. sp. (PL XYI., Fig. 1). 



Zooecia rhomboidal, flat ; margins linear, raised ; a very few 

 small pores round the margin. Thyrostome lofty, with slightly 

 raised peristome ; a deep narrow sinus in the proximal border. 

 An avicularium on each side below the thyrostome, with the 

 mandibles pointing horizontally, and nearly meeting in the 

 median line. Ooecial cells large, pyriform, ventricose distally ; 

 aperture transverse, lenticular ; an avicularium on each side 

 below it with mandibles pointing horizontally inwards ; a small 

 perforated oval raised area below the aperture ; a few minute 

 pores, chiefly margii)al. 



Locality. — Mitchell River (J. Dennant). 



This differs from Diniorphocella (Adeonella) triton, in the 

 following respects : both the zooecial and the ooecial cells are 

 smaller ; in the infertile zooecia the avicularia are horizontal, not 

 vertical ; the thyrostome has a deep narrow sinus instead of a 

 very broad one ; the ooecial cells are pyriform, not oval, and the 

 distal part is ventricose ; the perforated area is small, somewhat 

 raised ; the aperture much smaller and narrower, and the pores 

 on the surface are very small and easily overlooked. 



I have drawn an ooecial cell and part of a zooecial one of D. 

 triton (Fig. 2), to show the diflerence between the two species, 

 and also because the ooecial cell has a more perfect perforated 

 area than that shown in Dr. MacGillivray's flgure. The two- 

 speeies are mounted on the same slide, as under a simple lens they 

 appeared to be the same. 



Phylactella cpibrosa, n. sp. (PL XVI., Fig. 3). 

 Zoarium encrusting. Zooecia irregularly oval, covered with 

 large perforations. Thyrostome oblong ; peristome much raised, 

 and rugose. 



