66 Proceedings of the Royal Society of Victoria. 



Schizopopella terebrata, n. sp. (PI. VII., Fig. 3). 



Zoarium encrusting. Zooecia undefined ; surface slightly 

 granulated, with irregularly disposed pores of various sizes, but 

 occasionally they are in a row, indicating the margin of the 

 zooecia. Thyrostome with a long sinus in the proximal margin. 

 Large raised avicularia, with long acute mandibles, on one side 

 below the thyrostome and in a similar position, sometimes one, 

 occasionally two very narrow slender avicularia with tlie 

 mandible pointing downwards. Ooecia small, globose, partially 

 immersed, surface rough. 



Locality. — Mitchell River (J. Dennant). 



In this species the sinus is unusually long and in addition to 

 the avicularia above described, there is, in the portion figured 

 (near the top) a semi-elliptical avicularium with a small projecting 

 plate at one end, and two small pores at the other, sometimes the 

 long narrow ones are reduced in length, and elongated oval in 

 shape. 



Schizoporella convexa, McG. (PI. VII., Fig. 4). 



I have specimens of this species from the Mitchell River 

 deposits, which bear ooecia. They are subglobose, adnate upon 

 the ooecia above, with a bordered area in front bearing radiating 

 lines, surrounded distally with a narrow cross-ribbed depressed 

 area and they are remarkably like those of Microporella diadema. 



Schizoporella ovalis, n. sp. (PL VII., Fig. 5). 



Zooecia irregularly hexagonal, ventricose ; a row of pores 

 (sometimes two) round the margin, sometimes absent. Thyros- 

 tome small, subtriangular, with a very narrow sinus. Avicularia 

 elongated oval, slightly raised, with mandibular cavity pointing 

 distally. 



Zr7(:(7//(>'.- -Mitchell River (J. Dennant). 



In the place of the ooecia in this species there are suborbicular 

 smooth concave areas with raised margins which probably 

 represent the dorsal walls of oi'bicular ooecia, but as they are 

 perfectly smooth it is possible they may be deeply immersed 

 ooecia : therefore, as it is uncertain which they are, I have not 

 included them in the specific description. 



