14 A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 



thyrostome, with a narrow vertical ridge from its upper part. Posterior surface 

 smooth. 



S.P. ; B. ; C.C. (W.) 



A well-marked species, readily distinguished by the prominent raised ridge 

 surrounding the fenestrate area. 



17. C. dcedala, n.sp. PI. I., fig. 28. 



Geminate zocecia broad, inclined at an angle to each other; fenestra? 7-12, 

 pyriforin, surrounded by a raised margin ; thyrostome wide, rounded above, with 

 entire lower margin and a denticle above the angles ; peristome thickened above ; a 

 narrow raised ridge extending upwards, with a depression (supra-avicularian 

 chamber) on each side ; avicularian chamber short, broad, and with a small 

 avicularium opening outwards ; two depressions directed outwards and slightly 

 forwards below the avicularium ; a long, narrow depression between the zocecia. 

 Posterior surface convex, smooth. 



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



At once distinguished by the massiveness and obliquity of the zocecia. I have 

 only seen geminate pairs. 



18. C. cincta, n.sp. PI. I., 29. 



Zocecia cuneiform ; 7 fenestra? opening into tubes diverging from the central 

 line, surrounded by a thick convex rim continuous with the thickened peristome ; 

 thyrostome rather lofty, straight below and with a small denticle above the angles ; 

 a narrow, raised, vertical ridge from the middle of the peristome ; avicularian 

 process wide, with a moderate sized avicularium opening outwards ; on each side 

 above the avicularium a long tubular process extending nearly directly upwards ; 

 two lateral depressions or chambers below the avicularium. Posterior surface 

 convex, smooth. 



M.C. 



19. C. Uneata, n.sp. PI. L, fig. 30. 



Zocecia much elongated, narrow ; a linear elevated tract extending nearly the 

 whole length and formed by a double row of about 15 narrow tubes on each side, 

 extending outwards from the central line, separated by deep grooves or fissures, and 

 opening at the extremities by small round pores ; lateral processes absent ; thyros- 

 tome lofty, lower margin seemingly straight. Posterior surface convex, smooth. 



S.P. 



A very peculiar species, totally unlike any other. The tubes, with their 

 terminal pores, are very distinct, and the dividing grooves in the only two specimens 

 I have seen are mostly fissured right through. 



