BY W. M. BALE. 787 



the mesial sarcotheca, but with the free part usually directed more 

 forward ; terminal and lateral apertures distinct. Cauline sarco- 

 thecae conical, with terminal and lateral apertures sometimes 

 united two on the stem at the base of each pinna, and one on 

 the pinna itself. 



Gonangial pinnae supporting a hydrotheca on the first intemode, 

 and on each of the next two (or sometimes on one only) a gonotheca, 

 which springs from a prominence consisting of a modified hydro- 

 theca with mesial and lateral sarcothecae ; the rest of the pinna 

 forming a nematocladium of several internodes, bearing sarcothecae 

 mostly arranged in sets of three (one mesial and two lateral). 

 Gonothecae ovate or rounded, much flattened, and provided with 

 a marginal wing, the sporosac surrounded by a circle of highly 

 refractive granules. 



Colour, light brown. 



Hob. Moreton Bay, Queensland, very common, obtained in 

 the dredge (Mr. John Brazier) : Manila (Kirchenpauer). 



The specimens which I received from Mr. Brazier included the 

 gonosome, which, as well as the trophosome, agrees very well with 

 Kirchenpauer's figures and description. The ramification of this 

 species is peculiar, the straight or slightly curved stem giving 

 origin to a number of branches which are almost always directed 

 to one side : examined closely, however, they are usually found to 

 form two series, being directed alternately a little to the right and 

 left. Normally, each side of the hydrotheca forms an angular lobe, 

 but these lobes are often rounded off so that the sides are only 

 slightly elevated. 



Among the first hydroids sent to me from the Australian 

 Museum were two specimens which I referred in the "Catalogue," 

 but with much doubt, to the Aglaophenia urens of Kirchenpauer. 

 According to Kirchenpauer the hydrotheca-margin of A. urens is 

 entire, while in the specimens referred to it forms angular or 

 rounded lobes at the sides, a difference, however, which did not 

 appear of great import \nce. But the branches of A. urens are 

 51 



