A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 89 



proposed by Whitelegge. The species agree with. Schizoporella in the structure of 

 the thyrostome and I, therefore, include them in the same family. 



1. B. cancellata, Busk, sp. PI. XII., fig. 1. 



Lunulites cancellata, Busk, B.M.C., II., p. 101 ; Waters, Q. J.G.S., 1882, pp. 257 

 and 512 ; Bipora cancellata, Whitelegge, Proc.L.S.N.S.W., 1887, p. 310 ; Cones- 

 charellina cancellata, Waters, A.M.N. II., Sept., 1887. 



Zoarium small, conical, nearly plane below. Zocecia alternate in rows radiating 

 from the apex, surface raised round the thyrostome; thyrostome nearly semi- 

 circular, lower lip straight, with a small sinus below ; peristome leaving a depression 

 below the lower lip of the true thyrostome, a small pore on the upper lip ; avicularia 

 small, with semicircular or rounded mandibular opening, disposed between the 

 zooecia usually one on each side. Base of zoarium inside the marginal fringe of 

 zooecia cancellated. 



B. 



2. B. philippinensis, Busk, sp. PI. XII., fig. 2. 



Lunulites philippinensis, Busk, B.M.C. II., p. 101; Bipora philippinensis, 

 Whitelegge, I.e., 311. 



Zoarium orbicular, raised in the centre. Zooecia alternate in radiating series, 

 raised round the thyrostome ; thyrostome nearly semicircular with a rounded sinus 

 in the lower lip ; peristome leaving a space with straight lower edge below the 

 under lip of the true thyrostome ; avicularia small, rounded or elliptical with cross- 

 bar for articulation of mandible ; a small pit in upjoer lip. Base with central part 

 inside zooecial fringe flat, covered with round bullate elevations, perforated or 

 having small avicularia similar to those on the front. 



S.P.; M.C. 



These two species are very closely allied and sometimes difficult to distinguish. 

 In B. cancellata the zoarium is conical with a sharp apex, while in B. philippinensis 

 it is much less elevated in the centre ; the thyrostome differs a little, the space 

 within the peristome below the lower lip being hollowed in its lower margin in the 

 former, and in the latter wider and nearly straight across. The avicularia also 

 differ, in the former having no distinct cross-bar for articulation, while in the other 

 it is usually well marked. In my specimens of L. cancellata the lower surface of 

 the zoarium is cancellated, possibly from the fracture of hollow elevations, while in 

 L. philippinensis it is closely covered with small round bullate elevations, having 

 numerous small avicularia. In both the supra-oral pore, although frequently well 

 marked, is frequently indistinguishable. 



N 



