Zoophytes from Australia and New Zealand. 
101 
Sertularella Jolmstoni , Gray. 
Sertularia Jolmstoni, Hutton, Trans. N.Z. Inst. vol. v.; Cougktrey, 
Trans. N.Z. Inst. vol. vii. 
Sertularella gracilis, Allman, MS. 
Sertularella Jolmstoni, Allman, Journ. Linn. Soc. vol. xii. 
This species is well represented in the collections to which 
] have had access, and, indeed, seems to be of common and 
widespread occurrence. I have little or nothing to add to 
the full and accurate descriptions already published, save to 
corroborate Dr. Coughtrey’s account of the gonangia. These, 
according to Dr. Allman, possess a u tubular orifice, which is 
situated excentrically on the truncated summit.” My speci¬ 
mens, like Dr. Coughtrey’s, show three distinct variations in 
the form of the gonangium. In the first the neck is tubular 
and elongated; in the second it is everted and inf imdibuliform; 
and in the third it is absent or inconspicuous. 
I think it extremely probable that the excentric position of 
the neck, as shown in Prof. Allman’s specimen, was only an 
accidental or abnormal variation from the more common 
type. 
The specimens hitherto described seem all to have been 
obtained in New Zealand; but I also possess some sent home 
by Dr. Ferd. Muller from Van Diemen’s Land. 
Sertularella exigua . (PI. XVI. fig. 3.) 
Trophosome. Hydrorhiza rather stout, creeping. Hydro- 
caulus attaining a height of about 2 inch, unbranched, much 
twisted at the base. Hydrothecae rather large, barrel-shaped, 
tumid, smooth or indistinctly wrinkled towards the mouth, 
diverging for about half their length ; margin thickened, 
flexuous; aperture four-sided. Colour whitish. 
Gonosome. A single gonangium to each hydrocaulus, at¬ 
tached close to the proximal end. Globular or obovate, 
strongly corrugated with transverse folds. 
Locality. New Zealand {Dr. Harvey). 
This is another very minute species, but one which I have 
had better opportunities of examining than the last. 
The hydrothecfe are of a very definite and characteristic 
form, and differ entirely from all the varieties of S. simplex (?) 
figured by Dr. Coughtrey. The zoophyte occurs creeping 
upon small seaweeds. 
Sertularella , sp. (PI. XVI. fig. 4.) 
Trophosome. Hydrocaulus minute, simple, divided by ob¬ 
lique joints into short internodes, each bearing a single hydro- 
