390 Proceedings of tke Royal Society of Victoria. 



This i-esembles C. setosa in having a spine gi'owing from 

 the side of the tubular orifice, but the zooecia are very much 

 more elongated and exserted ; the spine is not always present. 



Crisia cuneata, nov. sp. (PI. XXIX.. Fig. 12). 



Zoaria branching, from twelve to twenty zooecia in an inter- 

 node. Zooecia very much exserted : the whole surface finely 

 punctured. Ooecia free, obconical, closely punctate ; compressed 

 laterally with a flattened distal end on which is an oval aperture. 

 This is a very distinct form. 



Specimens of Thalamoporella rosieri var. falcifera and of the 

 new species I have, with Dr. Porter's kind permission, mounted 

 for presentation to the National Museum, Melbourne. 



EXPLANATION OF PLATES XXVIII. and XXIX. 



Fig. 1. — Thalamoporella rosieri, var. falcifera. 

 2. — Thalamoporella howensis. 

 3. — -Schizoporella gibberula. 

 4. — Schizoporella heteromorpha (young). 

 5. — Schizoporella heteromorpha. 

 6. — -Schizoporella heteromorpha (ooecia). 

 7. — Schismopora cucullata (young). 

 8. — Schismopora cucullata (ooecia). 

 9. — Mucronella centrota. 

 10. — Crisia howensis. 

 11. — Crisia howensis (ooecia). 

 12. — Crisia cuneata. 

 Figs. 1, 10, 11 and 12. x 25. 

 Figs. 2, 3, 4, 5, 6, 7, 8 and 9. x 30. 



ERRATA. 



Page 386, line 3, for xviii., xix., read xxviii., xxix. 



Page 387, line 10, a/Zer PI. insert xxviii. 



Page 387, line 27, ajier PI. insert xxviii. 



Page 388, line 5, after PI. insert xxviii. 



