BY W. M, BALE. 763 



the gonangia are of a totally distinct type. Only one of tlie latter 

 ^vas present, which was slightly distorted, so that its exact form 

 was rather doubtful, but it aj)peared to have two lateral wings 

 terminating upwards in angles at each side of the aperture. 



Sertularella microgona, von Lendenfeld. 

 (Plate XVI., fig. 8). 



Hydrocaulus simple, about 5 inch in height, composed of long, 

 slender internodes which are abbreviated above close to the 

 hydrothecte, and are undulated somewhat spirally in their lower 

 jtortions. Hydrothecae barrel-shaped, rather slender, somewhat 

 contracted towards the aperture, with about three transverse 

 rug* ; adnate ^ of their height or somewhat more, directed out- 

 wards and but slightly forwards ; aperture with four teeth and a 

 fL>ur-sided operculum ; 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 1 



Hab.—Vort Phillip. 



This species is a close ally of the S. ienella of Hincks, and is 

 very slender throughout. The portions of the internodes below 

 the hydrothecie are slightly waved, long, and tubular, often being 

 fully doiih)]e the length of the hydrotheca. The internal teeth 

 are three in number, and are arranged precisely as in S. indivlsa ; 

 but as S. microcoria has four marginal teeth, the internal ones do 

 not alternate regularly with them, the lower one being opposite a 

 marginal tooth, while the others are between the three upper 

 marginal teeth. A close examination of specimens of >S. jwlt/zonias 

 from Port Phillip sliows that a similar arrangement exists in that 

 species, thougii the internal teeth are so delicate and transpaieut 

 that they are easily overlooked. 



Dr. von Lendenfeld says that the gonangia of S. microyoiia 

 are without rings, but his outline hgiire siiows them transversely || 



wrinkled. 



