A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 11 



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

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

 and minutely sulcate. 



8. C. pulchella, Maplestone. PI. I., fig. 15. 



C.ptUchella, Maplestone, Journ. Mic. Soc. Vict., May 1880 ; McG., P.Z.Y. 89. 



Zocecia broadly ovate, smooth; a row of about 10 round, sub-marginal fenestras 

 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 zooecia. In the fossil they are worn off. 



9. C. elongata, n.sp. PI. I., fig. 16. 



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

 fenestrae 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 of the single zooecium 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 zooecia 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. Kev., April, 1858 ; McG., P.Z.V. 

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



Zooecia broadly ovate ; 7 or 8 rounded or pyriform fenestrae 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 



