340 NOTES ON SOME AUSTRALIAN POLYZOA, 



The shape of the oral aperture generally approaches that of 

 Cellej)ora eatonensis as figured by Busk in the "Challenger' 

 Polyzoa, PI. XXIX., fig. 5b, but the sinus varies in width so 

 much that in some cases the aperture might be described as oval 

 with two lateral denticles at the base. 



It is evident that the seven species already enumerated are 

 closely allied to each other, and can no longer remain in the 

 various genera to which they have been referred. They do not 

 belong either to the genus Lunulites or to Gupularia ; and the 

 genus Conescharellina as at present defined would not admit them • 

 the same may also be said of Flabellopora. Mr. A, W. Waters in 

 referring to Lunulites incisa H. says it "is a species of the 

 Schizoporellicke." Nevertheless to whatever family they may 

 ultimately prove to be related, at present I venture to make a new 

 genus for their reception. 



BiPORA, n. g. 



Zoarium uni-or bilaminate, conical, or forming lobate or flab- 

 ellate expansions ; growth intercalary ; zocecia immersed, erect, 

 side by side, with their bases resting on a cancellated lamina, 

 forming alternating rows directed to the primary part of the 

 zoarium ; oral aperture with a well-marked sinus in the lower lip. 

 A special pore above the mouth ; peristomial orifice formed by 

 the gradual extension of a narrow slit and the removal of a portion 

 of the calcareous lamina. Ocecia external, globose. 



(1.) BiPORA CANCELLATA, Busk. 



Lunulites cancellata, Busk, Brit. Mus. Cat. Polyz. 1854, Part 

 II, p. 101, pi. CXIII, figs. 4-5-6-7. 



Zoarium conical, plane or slightly convex beneath ; zooecial 

 apertures I'ounded above, with a distinct sinus below ; peristome 

 elevated above, depressed below, with a circular pore on its upper 

 border • an avicularium on each side of the mouth, with a sub- 

 circular mandibular space. 



