A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 59 



5. C. termincda, Waters. PL VIII., figs. 13, 14. 

 Cribrilina terminata, Waters, Q.J.G.S., 1881, p. 326; 1882, p. 507. 



Zoarium encrusting, or erect and nni- or bilaminate, or cylindrical. ZooBcia 

 confluent, tlie margins smooth and usually raised ; surface convex, Avitli numerous 

 large round pores (with a minute denticle on the inner edge) arranged concentrically 

 and obscurely radiately ; thyrostome straight below, arched above and nearly semi- 

 circular; several small rounded avicularia round the thyrostome, usually one or 

 tAvo above and one or two in the neighbourhood of the angles below ; occasionally 

 other vicarious avicularia, with long triangular mandibles, between the zoa-cia. 

 Ocecia subimmersed, smooth, with a large pore (probably avicularian) on each side. 



S.P.; M.C.; B. ; C.B. ; W.P. ; L.I3. ; C.C. (W.) 



In the fertile zocecia, the ujiper margin of the peristome is a broad crenulated 

 band, the opening of the ocEcium seeming to be above it. 



The small specimen shewn in fig. 11, which I was at first inclined to regard as 

 a distinct species, I believe to be a younger state of the same, or at all events only a 

 variety. The zocecia are nearly circular, the pores smaller and arranged in very 

 regular radiating grooves. 



6. C. dentlpora. Waters. PI. VIII., fig. 18. 



Cribrilina dentipora, Waters, Q.J.G.S., 1881, p. 320. 



Zoarium filiform, erect. Zocecia on one side only, in single series, each arising 

 from the U2)per part of the zooecium below and to one side, directed obliquely 

 upwards and outwards and springing alternately from opposite sides, so that the 

 series is zigzag ; numerous pores, with a small sharj) denticle on the inner side, 

 arranged in concentric series ; thyrostome nearly straight l)elow, expanded and 

 arched above ; one or two large sjjines above ; an ellii)tical avicularium on each 

 side of the base of the thyrostome. Dorsal surface of zoarium with a sinuous 

 depression following the direction of the zocecia. 



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



7. C. elecata, n.sp. PI. VIII., fig. 19. 



Zoarium very small, nearly spherical, Avith zocecia on the whole surface, and 



probably free. Zoa'cia nearly circular, with a series of 8-10 short, thick, Avidely 



separated ribs, rising abruptly and curved iuAvards to a thick i)late, having round 



its margin a concentric row of round pores and several others irregulai'ly placed 



within these, the anterior edge of the plate being straight ; thyrostome subcircular, 



with a sinus beloAV, sloping backwards from Lhe edge of the plate ; an avicularium 



la 



