Zoophytes from Australia and New Zealand. 
Ill 
Thuiaria monilif era. 
Sertularia moniliferit, Hutton, Trans. N.Z. Inst. vol. v. p. 25G: Cough- 
trey, ibid. vol. vii. p. 282, &c. 
Thuiaria cerastium, Allman, Journ. Linn. Soc. xii. p. 271. 
The very excellent figures and description given by Prof. 
Allman leave no doubt whatever as to the identity of his species 
with S. monilifera of Captain Hutton and Dr. Coughtrey. 
The latter gentleman, in a paper communicated to the Ann. 
& Mag. Nat. Hist. (Jan. 1876), expressed considerable doubt 
as to the generic relations of this curious species, and appears 
to have become convinced that, to whatever genus it should 
be relegated, it could not be retained in Sertularia. Accord¬ 
ing to Prof. Allman’s definition of the genus, however, the 
present form is quite admissible as a species of Thuiaria. 
My collection contains a single example from Idokianga, 
New Zealand, collected by Dr. Jolliffe, and differing from 
Allman’s figure only with regard to the gonangia, which are 
considerably narrower and less tumid in my specimens. In 
this respect they approach very closely to Dr. Coughtrey’s 
figure ( 2 . c.). According to Captain Hutton’s original de¬ 
scription, the apertures of the liydrothecas are entire or furnished 
with two obtuse teeth ; these latter, which are only indistinctly 
visible in my specimen, have been overlooked by Dr. Allman. 
Thuiaria ambigua , sp. nov. (PI. XIX. figs. 2, 2 a.) 
Sertularia -?, Coughtrey, Ann. & Mag. Nat. Hist. Jan. 1876, p. 29, 
note. 
Trophosome. Hydrorhiza small, consisting of short twisted 
fibres. Ilydrocaulus attaining a height of about 6 inches, 
dark brown in colour. Main stem very much stouter than the 
pinnae. Pinnae alternate or subalternate, short. A number of 
large branches arise in a cluster near the upper part of the 
stem. Hydrotheca?—on the pinnae, opposite, in pairs, closely 
adnate, a joint between every three or four pairs; on the stem, 
in two rows, one going up each side, with very short inter¬ 
spaces ; tubular, deeply immersed, smooth ; orifice with two 
broad lateral teeth. 
Gonosome. Gonangia attached to the main stem and prin¬ 
cipal branches, close to the origin of the pinnae ; large, obovate, 
smooth, margin slightly everted, operculate. 
Locality. Sealer’s Cove [Dr. Ferd. Muller). 
I am not quite confident about the generic relations of this 
species ; but I think that it will most naturally come under 
Thuiaria as newly defined by Prof. Allman (Journ. Linn. Soc. 
vol. xii. Zool.; see also { Hydroids of the Gulf-Stream’). 
