A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 59 



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

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



Zoarium encrusting, or erect and uni- or bilaminate, or cylindrical. Zooecia 

 confluent, the margins smooth and usually raised ; surface convex, with 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 

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

 other vicarious avicularia, with long triangular mandibles, between the zooecia. 

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



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



In the fertile zooecia, the upper 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. 14, 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 zooecia are nearly circular, the pores smaller and arranged in very 

 regular radiating grooves. 



6. C. dentipora, Waters. PL VIII., fig. 18. 



Cribrilina dentipora, Waters, Q.J.G.S., 1881, p. 326. 



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

 from the upper 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 sharp denticle on the inner side, 

 arranged in concentric series ; thyrostome nearly straight below, expanded and 

 arched above; one or two large spines above; an elliptical 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. elevata, n.sp. PL VIII., fig. 19. 



Zoarium very small, nearly spherical, with zooecia on the whole surface, and 

 probably free. Zooecia nearly circular, with a series of 8-10 short, thick, widely 

 separated ribs, rising abruptly and curved inwards to a thick plate, having round 

 its margin a concentric row of round pores and several others irregularly jnaced 

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

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



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