6 Proceedings of the Royal Society of Victoria. 



avicularia which, however, are very much longer than the zooecia, 

 those of Indica being oialy about half the length ; and it difiers 

 from all the forms in being bilaminate, and in the calcareous 

 extension below the opesia, Vietween the foramina being very 

 narrow and depressed proximally below the surface of the ooecia, 

 causing the proximal margin of the open space to be continuous, 

 and the foramina, consequently, not be so distinctly, or distally, 

 separated, as in the other varieties. This feature is much more 

 marked in the following species, in which, hosvever, there are 

 other characteristics which separate it from T. rosieri and its 

 varieties. 



Thalamopopella gracilis, n. sp. (PI. IL, Fig. 13). 



Zoarium cylindrical, about six zooecia in transverse direction. 

 Zooecia elongate, sides straight, arched above, margins raised ; 

 opesia subcircular, below it an opening with a downward 

 prolongation of the upper margin, reaching and united to the 

 under surface of the lower margin ; avicularia oval, pointed 

 proximally. 



Locality. — Jimmy's Point, Gippsland Lakes (J. Dennant). 



I found numerous specimens of this species in the deposit. It 

 differs from the preceding one in the following particulars : — The 

 zoarium is cylindrical or in Vincularia-form, the zooecia are 

 much smaller, there is a very slight tuberosity on each side of the 

 opesia, the calcareous process dividing the two foramina is much 

 narrower, is not always central, and in some instances does not 

 appear to be connected with the proximal mt^rgin causing the two 

 foramina to appear as a single opening in a much more marked 

 manner than in the preceding species ; the avicularia are shorter, 

 have a stout bar, and point proximally, not distally as they do in 

 all the varieties of T. rosieri which have them. 



Palmicellaria quadrifrons, n. sp. (PI. IL, Fig. L5). 



Zoarium free, erect, quadrate. Zooecia in single series on 

 each of the four faces, tubular, with perforations on the inner 

 margin, distal part projecting ; thyrostome suborbicular, with 

 raised thin peristome, on one or both sides of which is an avicu- 

 larium with a globular base, on the inner edge of which are two 

 small tubular projections ; the mandible is triangular, and opens 

 into the inside of the peristome. 



