52 A >tONOGRAPn OF THE TERTIARY POLYZOA OF VICTORIA. 



lower soiKuatcil l)y ;i usually porfovated calcareous lamina Avitli a lari^e variously 

 shaped opeiiiny (opesia) at the anterior end and eontaining the polypide. 



Thalamoporolla, Hi neks. 



Zoa'cia with the anterior extremity of the calcareous lamina separating the two 

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

 the cell to which it is united, foi-niing an orifice which is partly closed hy the 

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



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



Zooecia short and hroad, lamina with numerous whitc-hordered pores and with, 

 anteriorly, a large foramen on each side; opesia arched ahove, straight Ix-low ; 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 UiploporeUa and 

 Thairapora. 



2. T. rozicri, Andoin, sp. PI. VI., fig. 10. 



Mciiibfaiiipora Rozicri, Busk, B.M.C. Pt. IL, 59 ; Steijiiioporclla Bozieri, 

 Smitt, P.P. Pt. II., 10 ; Thalamoporella, id. Uincks, A.M.N.U., Pehruary, 1887 ; 

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



Zoa^cia elongated; oj)csia arched ahove, hollowed helow ; surface granular with 

 a large ()l)li([ue oval opening on either side helow the ojiesia. 



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



The typieal T. rozieri has a small tuherosity on each side of the opesia. This is 

 very ohscurely seen in the figured s])ecimen, hut is wanting in the others, in w hich 

 respect the present form would agree with that descrihcd hy llincks (A.M.N.H.) 

 as var. Indica. None of ray specimens have avicularia or zowcia. I'he ooicium in 

 recent specimens is descrihcd hy Busk as glohose, carinatc in front. 



Steganoporclla, Smitt. 



Zorecia with the ahoral compartment divided into two chambers hy a diaphragm, 

 the lower of which is eonncctcd hy a tubular passage with the upper and contains 

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

 in by the o2)erculum and membranous front wall. Operculum very large. External 

 ooicia wanting, represented by an internal chaiiil)er. 



