A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 11 



A marked variety (fig. 14) occurs, having the zooecia wider and the lateral 

 processes very wide and slightly retrocedent, and with the posterior surface convex 

 and minutely sulcate. 



8. C.pulcheUa, Maplestonc. PI. I., fig. 15. 



C.pulchella, Maplcstone, Journ. Mic. Soc. Vict., May 1880; McG., P.Z.V. 89. 



Zooecia broadl}' ovate, smooth; a row of about 10 round, sub-marginal fenestra) 

 extending to each side of the thyrostome ; thyrostome straight below with a round 

 sinus in the centre. 



S.P. A living Victorian species. 



In recent perfect specimens the lateral processes are conspicuous and extend 

 nearly the whole length of the zocecia. In the fossil they are worn off. 



9. C. elongata, n.sp. PI. I., fig. IG. 



Zocecia ovate, produced above and below; about 10 or 11 small, pyriform 

 fenestrre arranged round the margin of an oval space occupying most of the front of 

 the zocecium and bounded by a thick, raised, marginal rim ; thyrostome lofty, 

 peristome of arched portion much thickened, contracted towards the straight lower 

 margin and having a minute denticle above the angle on either side ; a vertical 

 thickened band extending from the middle of the peristome with a large supra- 

 avicularian chamber or depression on each side ; a tubular avicularian chamber on 

 each side, opposite the middle of the thyrostome, lodging a minute avicularium . 

 a long, narrow, infra-avicularian chamber or depression ; on each side of the inferior 

 prolongation ot the single zoo3ciuni or geminate pair a long, narrow chamber or 

 depression. Posterior surface sharply convex. 



S.P. ; M.C. 



Allied to C (data, from which it differs in the narrower zocecia and their 



superior and inferior prolongation, and the thicker margin enclosing the fenestrate 



space. Some of Waters' figures of C. alata are referable to this species. The two 

 seem to me, however, to be sufficiently distinct. 



10. C. alata, Wyville Thomson. PI. I., fig. 17. 

 C. alata, Wyv. Thomson, Dublin Nat. Hist. Rev., April, 1858 ; McG., P.Z.V. 

 24; Waters, Q.J.G.S., 1881, p. 317. 



Zooecia broadly ovate ; 7 or 8 rounded or pyriform fenestrpe In a distinct space, 

 the margin of which is very slightly thickened ; thyrostome with a straight entire 

 lower margin and a minute denticle on each side ; lateral processes very wide, 

 bearing a tubular avicularian chamber terminated by a minute avicularium, and 



C2 



