112 A MONOGRAPH OP THE TERTIARY POLTZOA OP VICTORIA. 



S.P. ; M.C. ; B. ; C.B. Recorded by Waters also from S.W. Victoria, Mt. 

 Garnbier, and Aldinga. Recent Florida and Australia. 



In the typical form this is a well-marked species. The much-produced peristome 

 has a long narrow groove extending downwards, frequently closed over in whole or 

 in part to form a tube, in which case there may be another slight groove on each 

 side ; in many instances there is a small pore at its termination. The avicularium 

 varies much. It is mostly situated on a considerable elevation, the mandible, 

 frequently of considerable size, directed obliquely or straight downwards ; sometimes 

 it is quite small, with the mandible rounded. In many zooecia it is altogether 

 wanting. Waters' var. mucronata has a large oval avicularium below the thyrostome, 

 and above this the peristome rising into a mucro. It lias a considerable resemblance 

 to R. aciculifera, but Waters figures the characteristic ooecia of R.fissa. 



Var. insignis. 



Zooecia broad, flat, of nearly uniform width, with a narrow raised margin ; 

 lower lip of thyrostome widely hollowed, the angles pointed, and with a small sinus ; 

 frequently two small pores inferiorly ; no avicularia. 



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



Var. hexagona (fig. 9). 



Zooecia broad, flat, hexagonal, with narrow raised margins ; peristome much 

 produced ; lower lip with a small sinus from which extends a short ridge or tube. 



M.C. 



3. R. aciculifera, n.sp. PL XV., figs. 2, 3, 4. 



Zoarium fenestrate. Zooecia ovate, smooth, separated by distinct raised lines ; 

 thyrostome with a sharp aciculate mucro in the centre of the lower lip and a slightly 

 raised process on either side ; immediately below this a long raised sessile triangular 

 avicularium (occasionally absent), with the mandible pointing downwards and 

 reaching to the middle of the zocecium ; below this avicularium a small round pore. 

 Ocecia elongated, little prominent, smooth above or with a small fissure, grooved 

 below, and the lower margin forming a broad plate with a rounded notch on each 

 side. Dorsal surface smooth, with irregular raised vibices and a few ovate 

 avicularia. 



S.P. 



4. R. rimata, Waters. PL XV., figs. 12, 13. 



R. rimata, Waters, Q.J.G.S., 1881, 343. 



Zoarium probably fenestrate, trabecuhe narrow. Zoo3cia elongated, narrowed 

 below, separated by narrow raised lines ; peristome projecting forwards with a 



