BY WILLIAM A. HASWELL, M.A., B.SC. 355 



diameter of tlie cell in length. Central area and intermediate 

 spaces occupied by numerous polygonal cancelli, bounded by 

 slender trab eculrc, from the point of anastomosis of which frequently 

 arises a short perpendicular spinule ; cancelli smaller than the 

 mouths of the cells, and occupied in turn by a series of very 

 minute secondary cancelli. 



Sab. On Fucus, Clark Island, Port Jackson. 



12. Discoporella tridentata, sp. no v. 



Zoarium strongly convex, of circular outline ; margin thin, 

 marked with radiating ridges ; cells free, distant, in radiating 

 rows ; peristome produced into three points, two (smaller) internal, 

 and one external. Whole surface divided into angular arese by 

 smooth, semicylindrical, anastomosing trabecule, the area) 

 punctate. 



Common on Fucoids, Port Jackson. 



Genus Crisia, Lamx. 



13. Crisia punctif era, sp. nov. 



Cells 9 — 14 in each internode, elongate, often projecting 

 considerably, with numerous punctations ; mouth circular, or 

 elliptical, usually with a small tooth-like thickening behind. 

 Branches arising from the third or fourth cell, usually the third ; 

 joints black. Radical tubes 4 — 5 jointed, punctated, arising 

 from the third or fourth cell, usually the third. Growing in close 

 tufts. 



Hal. Manly Beach, Port Jackson, etc. 



Allied to C. denticulata, but of thicker habit and much more 

 numerous punctations. 



14. Crisia incurva, sp. nov. 

 Cells 6 — 1 1 in each internode, cylindrical, curved forwards, 

 annulated, with tolerably numerous small punctations ; branches 



