A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 113 



vertical fissure exteudiug its whole length, forming a large prominence on each side, 



witli the inner margin turned hackwards especially towards the hasc of the sinus ; 



the peristome frequently surrounded by a narrow raised line. A small avicularium 



below the thyrostome with the broad mandible pointed downwards, and below tha^,^^;,. x/'oT^x^ 



a small pore (lioth frequently absent). Dorsal surface divided into areas, angulrM" |,|.. 



above and below, separated by narrow raised vibiccs, smooth, with numerous smaJjj^fQf^TatH'^ 



nodular elevations and a few small pores ; scattered immersed elliptical avicularia, 



with the mandible expanded and sometimes almost spatulate. 



S.P.; M.C. ; B. ; C.B. 



Distinguished l)y the lofty peristome bulging on each side of the median 

 fissure, and by the elongated noduliferous areas on the back of the zoarium. 



5. Z?. avicularis, McG. 



B. avicularis, McG., T.R.S.V., 1882 ; P.Z.V., 94, 95. 



Zoarium fenestrate ; fencstrfc elongated, wider than the narrow trabecular. 

 Zoo3cia ovate, sejiaratcd by narrow raised margins ; thyrostome with a small sinus 

 in the lower lip, the angles on each side of the sinus produced into a sharp point ; 

 on the front of the zooecium a large bullate elevation supporting an avicularium, 

 and frequently a small elliptical avicularivim to one side ; several small pores on the 

 front of the zoa?cia. Dorsal surface strongly vibicate, with a few avicularia. 



S.P. Recent Victoria. 



I have only a single specimen, which seems referable to R. avicularis. In the 

 recent specimens there is a long spine on each side of the thyrostome. In the fossil 

 the processes on the sides of the sinus are not so distinct and the spines are only 

 shewn on one or two of the zocecia. In the recent form there are no anterior 

 avicularia except those on the bullate elevations. There are no ocEcia in the fossil 

 specimen, in the recent they are rounded and entire. I have little doubt, however, 

 of the identification. 



6. B. schiuqjperensis, n.sp. PI. XV., fig. 6. 



Zoarium fenestrate. Zoojcia wider in the middle, separated by prominent 

 raised lines ; thyrostome nearly circular, with a small rounded notch in the lower 

 lip, and two or three spines (usually absent) above ; peristome thickened all round, 

 more produced at the sides ; an avicularium about the middle of the zocecium. 

 Dorsal surface smooth, with raised vibices ; an avicularium usually towards the 

 inferior part of each area. 



S.P.; B. 



Q 



