346 NOTES ON SOME AUSTRALIAN POLYZOA, 



figure given on pi, 45, fig. 3, in Hincks's " Brit. Marine Polyzoa," 

 of Schizoporella hyalina, and it was only after repeated exatnination 

 that I saw the true oral aperture, owing to a belief that the pore 

 and the opening represented it. Although the true aperture is 

 not deeply immersed, it is difficult to see at first on account of the 

 peristome obstructing the view, but when once seen it presents a 

 well formed sinus in the lower lip at the opposite end of the mouth 

 to that of the pore. It is from the apparent double character of the 

 mouth that the name Bipora is given to the genus. 



(7.) Bipora {V) elegans. 



Flaldlofora elegans, d'Orb., Waters, Quart. J. Geol. Soc. Feb. 

 1887, p. 71. 



Zoarium free, bilaminate, flabelliform in large examples, | an 

 inch wide by f of an inch deep, with a projecting nodule in the 

 centre on the concave side ; zooecia wholly immersed, erect, side by 

 side, their bases separated by a thin cancellated layer, forming 

 alternate rows, and directed towards the projecting nodule ; oral 

 aperture rounded above, with a rather wide sinus below ; peristome 

 slightly higher above the mouth than below ; orifice nearly round 

 with a median pore above, a depressed avicularium on each side, 

 usually below the mouth, occasionally another in front ; mandibles 

 subcircular pointing upwards and outwards, a number of irregular 

 avicularian cells on the nodular projection similar to those on B. 

 angulopora. 



Log. — Port Jackson. 



If this species should prove to be difierent (as I think it will) 

 from the fossil form described by d'Orbigny as Flahellofora elegans^ 

 it can remain as B. elegans, Waters. D'Orbigny's figure (Paljeont. 

 Frang. Bryoz. Tom. V. pi. 661) certainly resembles the recent form. 

 The same may be said of B. umhonata, which comes nearest to 

 d'Orbigny 's species ; if it were not for the elevated nodules, the 

 last-named might pass for the fossil species. I have examined about 

 nine specimens in all, two of them being less than ^ of an inch in 

 their greatest diameter, which when placed on their convex edges and 



