142 Proceedings of the Royal Society of Victoria. 



Locality. — Wilkinson's, No. 4 (Hall cancl Pritchard). 



A small fragment only. This is near P. porosa (McG.), but 

 the zooecia are larger and there is no space devoid of pores below 

 the thyrostome as in that species. 



Schismopora cipcumvaliata, n. sp. (PL XVI., Fig. 4). 



Zoarium encrusting. Zooecia oval, ventricose ; surface coarsely 

 granular. Thyrostome arched distally, proximal margin straight, 

 with a small sinus in the centre ; peristoine oval, very thick and 

 much raised. 



Locality. — Spring Creek (T. S. Hall). 



I am doubtful whether to place this in Schismopora or Schizo- 

 porella, but the thyrostome is placed at a considerable distance 

 foelow the highly raised peristome and in this respect agrees 

 rather with Schismopora than with Schizoporella. I have only 

 the fragment illustrated and the two lower zooecia do not ajDpear 

 to be perfect, the lower portion is probably broken away. 



Schismopora otwayensis, n. sp. (PI. XVI., Fig. 5). 



Zoarium small, globular. Zooecia irregularly arranged, sub- 

 immersed, surface smooth. Thyrostome semicircular with a sinus 

 in the proximal mai'gin ; peristome highly raised, being produced 

 into a tubular, or subtubular elevated process on the distal 

 margin, surmounted by an avicularium with the mandible point- 

 ing upwards ; sometimes a small umbo, with a perforation, on 

 the proximal margin. Large spatulate avicularia scattered 

 among the zooecia. Ooecia hemispherical (kettledrum shaped), 

 with flat vertical front wall. 



Locality.— Ca,^e Otway (Hall and Pritchard). 



This resembles Cellepora granum but the thyrostome (or primary 

 -orifice) has a sinus in the proximal margin which removes it from 

 Cellepora, and the avicularium is at the summit of the tubular 

 pi'ocess and not near the base. 



Cellepora stellata, n.sp. (PI. XVI., Fig. 6). 



Zoarium discoid, raised in the centre. Zooecia oval ; marginal 

 ones produced distally, surface smooth, front somewhat flattened. 

 Thyrostome sub-orbicular with distal margin incurved and an 

 avicularium above. 



