212 Proceedings of the Royal Society of Victoria. 



A single specimen. The highly raised avicularium projects 

 over the tliyrostonie so much as to give it the appearance of being 

 hour-glass shaped, but the true shape can be distinguished, it is 

 suborbiculai*, slightly broader distally, with a denticle on each 

 side near the pi^oximal portion. 



Ovaticella, nov. gen. 



Zooecia ovate, ventricose ; a large perforated area in front. 

 Tliyrostonie transversely elliptical, opening upwards. 



Ovaticeila turbinata, n. sp. (PI. XXXV., Fig. 21). 



Zoarium unilaminate. Zooecia oval, much raised, distinct, 

 arising from a flat surface ; the actual margins or junction of the 

 zooecia being indistinguishable. In the centre there is a large 

 cii'cular perforated area, above which are a large and small poie 

 on each side below the thyrostome. Thyi'ostome transversely 

 elliptical, at the summit of the zooecia, opening upwards. 



Locality, — Mitchell River (J. Dennant). 



A single specimen, which is not in very good preservation. 

 The perforated area has broken away, leaving a large stellate 

 opening. This area and the shape and aspect of the thyrostome 

 are very distinctive. 



EXPLANATION OF FIGURES. 



Plates XXXIY., XXXV. 



Fig. 1. — Membranipora ligulata. a. vicarious avicularia. 

 2. — Macropora cribrilifera. 

 3. — Cribrilina turgida. 

 4. — Micropora elegans. 

 5. — Micropora lunipuncta. 

 6. — Micropora carinata. a. front view of zooeciuni with 



pores. 

 7. — Membraniporella decorata. 

 8. — Membraniporella rugosa. 

 9. — Corbulipora ampulla. 



