BY W. A. HASWELL, M.A., B.SC. 35 



Sub-order Cyclostomata. 



1. Orisia terrEe-reginse, sp. nov., Plate I., fig. 1. 



Cells 16 — 22 in each, internode, closely punctate, prominent, 

 the free portion inclined forwards ; mouth circular, entire ; 

 branches arising from the eighth to the thirteenth cell of the 

 internode ; joints black. 



The free portion of the cell in this species is not so long as in 

 C, incurva ; the length of the internodes distinguishes it from the 

 other described Australian species. From C. elongata, M.-Edw., as 

 figured and described by Busk, is is distinguished chiefly by the 

 general habit, and the colour of the nodes ; from C. ehurneo- 

 (lenticulata, Smitt, to which it is also allied, it is distinguished by 

 the number of cells in each internode and the point of origin of 

 tbe branches. 



2. Idmonea radians, Lamk 



3. Idmonea milneana, jyOrligny. 



A much more delicate variety than that met with in Port 

 Jackson, and having the mouths of the cells relatively larger. 



4. Idmonea irregularis, Ilenegliini. 



5. Idmonea marionensis, Husk. 

 Colour light purple. 



6. Pustulipora delicatula, Busk. 



7. Pustulipora proboscidea, U. Forbes. 



8, Pustulipora australis, JBusk, var. ? 



Resembles P. australis, in habit and in the form of the cells ; 

 but the summits of the papilla) are not black. 



9. Pustulipora fragilis, sp. nov., Plate I., fig. 2. 



Zoarium very slender, sub-cylindrical, cells elongate, exserted, 

 curved outwards, separated by wide intervals ; the general surface 

 covered with numerous minute black-pointed spinules. 



