52 A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 



lower separated by a usually perforated calcareous lamina with a large variously 

 shaped opening (opesia) at the anterior end and containing the polypide. 



Thalamoporella, Hincks. 



Zooecia with the anterior extremity of the calcareous lamina separating the two 

 chambers, having a narrow calcareous wall carried up to a level with the margin of 

 the cell to which it is united, forming an orifice which is partly closed by the 

 operculum ; on each side of it a large foramen. Ooecia external. 



1. T. lata, n.sp. PI. VI., fig. 11. 



Zooecia short and broad, lamina with numerous white-bordered pores and with, 

 anteriorly, a large foramen on each side ; opesia arched above, straight below ; a 

 radially grooved hollow mamilliform process on each side of the opesia. 



S.P. 



A well marked species of which I have only seen the small fragment figured. 

 The mamilliform processes are strikingly similar to those found in Diploporella and 

 Thairapora. 



2. T. rozieri, Andoin, sp. PL VI., fig. 10. 



Membranipora 'Rozieri, Busk, B.M.C. Pt. II., 59 ; Steginoporella Rozieri, 

 Smitt, P.B. Pt. II., 16 ; Thalamoporella, id. Hincks, A.M.N.H., Eebruary, 1887 ; 

 Waters, Q.J.G.S. 1882, p. 505 ; A.M.N.H. September, 1887. 



Zooecia elongated ; opesia arched above, hollowed below ; surface granular with 

 a large oblique oval opening on either side below the opesia. 



M.C.; M. Living. Florida, South America, Australia, New Zealand, etc. 



The typical T. rozieri has a small tuberosity on each side of the opesia. This is 

 very obscurely seen in the figured specimen, but is wanting in the others, in which 

 respect the present form would agree with that described by Hincks (A.M.N.H.) 

 as var. Indica. None of my specimens have avicularia or zooecia. The ocecium in 

 recent specimens is described by Busk as globose, carinate in front. 



Steganoporella, Smitt. 



Zooecia with the aboral compartment divided into two chambers by a diaphragm, 

 the lower of which is connected by a tubular passage with the upper and contains 

 the polypide ; the whole of the upper part of the cell forming a large cavity, closed 

 in by the operculum and membranous front wall. Operculum very large. External 

 ocecia wanting, represented by an internal chamber. 



