102 Proceedings of the Royal Society of Victoria. 



Sertularella macrotheca, Bale. 

 (Plate IV., fig. 3.) 



The gonangia are smaller than those of my former specimens, 

 and have the transverse undulations much deeper, closely approxi- 

 mating to those of S. solidula. 



Port Phillip Bay (Mr. J. B. Wilson). 



Sertularella Johnstoni, Gray. 



Some of the specimens have the hydrothecse more conical than 

 the commoner forms, therein resembling specimens from New 

 Zealand, but agreeing with other Victorian specimens in the 

 shape of the gonotheca?. 



Port Phillip Bay (Mr. J. B. Wilson). 



Sertularella angulosa, n. sp. 

 (Plate IV., fig. 6.) 



Shoots simple, short, zig-zag, divided by slightly-twisted joints 

 into internodes, each bearing a hydrotheca on its upper part. 

 Hydrothecaj adnate from one-third to one-half their height, large, 

 divergent, barrel-shaped, but smaller towards the summit, with 

 about six distinct sharp annular ridges ; aperture expanding, 

 with four teeth ; three internal compressed vertical teeth, two 

 of which are within the two upper emarginations of the border, 

 and the third opposite the inferior marginal tooth. 



Gonothecse % 



Hab. .? 



In habit resembling S. polyzonias, but the lower internodes are 

 mostly more strongly zig-zag than in that species, while the hydro- 

 thecse are less contracted above in proportion to the diameter of the 

 lower portion, are not adnate for so far, and are more particularly 

 differentiated by the distinct ridges encircling them. The internal 

 vertical teeth are arranged exactly as in S. polyzoiiias and S. 

 microgona, and, as in those species, are so delicate and trans- 

 parent as to be easily overlooked, especially when the hydrothecie 

 are not perfectly free from the soft parts. 



