390 APPENDIX. 



rugae. Moutli as large as the diameter of the cup, margin 

 very slightly everted. 



Hah. — Prince of Wales Channel, Torres Strait, 9 fathoms. 

 Off Cumherland Islands, in 27 fathoms, fine grey mud. 



I see no reason why the present species should not come 

 under Sertularia. It is peculiar from the position and 

 extreme contiguity of the alternate cells. The ovicells 

 arise from the hack of the rachis towards the side. When 

 viewed posteriorly, the cells are seen through the trans- 

 parent rachis, and it might thus at first sight appear as 

 if the rachis itself were cellular and not tubular, but such 

 is not the case. The tube is wide and continuous from end 

 to end. 



2. Cells opposite — (sometimes alternate on the stem.) 

 {Dynamena.) 



a. Cells distichous. 



5. S. subcarinata, n. sp. 



Cells tubular, upper half divei^ent, ascending. Mouth 

 looking upwards, circular, with an anterior and two lateral 

 broad, expanding teeth. A narrow angular hne or keel 

 down the front of the cell. Ovicell — ? 



Hab. — Bass Strait, 45 fathoms dead shells. 



Colour white, transparent, growth small, straggling. 

 Branches irregular, divaricate nearly at right angles, sub- 

 alternate. The three expanding teeth and the anterior 

 ridge or keel, besides its habit, distinguish it from a Tas- 

 manian species with which alone can it be confounded. 

 The cells are large. 



6. S. patula, n. sp. 



Cells tubular, upper third free, divergent ascending. 

 Mouth perfectly round, looking upwards and outwards, 

 margin entire everted. Ovicell — ? 



Hab. — Bass Strait, 45 fathoms, dead shells. 



Colour whitish. A small parasitic species, with opposite 

 branches. 



7. S. orthogonia, n. sp. 



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