Further Notes on Australian Hydroids. 95 



Gonophores pedunculate, borne on the lower part of the 

 hydranth within the circle of tiliforra tentacles, umbrella with a 

 small opening and four radial canals, manubrium large. 



Larger branches deep red-brown, smaller ones lighter. 



^rt^.— Port Phillip Bay (Mr. J. B. Wilson). 



I have only seen a single mounted specimen of this species, 

 and cannot therefore give full particulars of its size and habit. 

 So far as it goes the specimen is monosiphonic, with the small 

 branches alternately directed slightly to the right and the left, 

 while the polypiferous i-amules are also directed slightly to right 

 and left, but are not strictly alternate, two often following on 

 the same side. The polypidom could be readily distinguished 

 from that of any other Australian hydroid known to me by the 

 extent and distinctness of the annular wrinkling of the perisarc, 

 which answers to Ellis' description of a " tubulous coralline 

 wrinkled like the windpipe " far more closely than does the 

 Tubularia larynx to which that description was applied. 



The hydranths differ from those of Pennaria aiistralis in no 

 important particular except in having the capitate tentacles 

 fewer in number and confined to a single circlet round the base 

 of the proboscis, instead of being scattered irregularly over the 

 body. It is possible that the number of the filiform tentacles is 

 habitually double that of the capitate ones, but I had not a 

 sufiicient number of hydranths in which the tentacles could be 

 counted to satisfy myself that such was the case.- 



The gonophores, which are borne one or two on a hydranth, 

 are small and regularly ovate, and like those of Ceratella as 

 figured by Professor Spencer, are quadrate in transverse view, 

 owing to the enlargement of the umbrella at the four sides where 

 the radial canals are situated. In side view the umbrella is seen 

 to thin rapidly away to the small orifice at the summit (which is 

 closed in by the ectotheca), and no traces of tentacles could be 

 detected. In these points they agree with the immature gono- 

 phores of Pennaria (except that the structure of the umbrella is 

 more distinct), and it is probable that they also agree with them 

 when mature in being completely open and in the possession of 

 rudimentary tentacles, which condition exists also in the species 

 of Halocordyle already known (H, tiarella). 



