A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 17 



as to have a Imstatc form. Posterior surface with a grooved vertical ridge, on eacli 

 side of which it is smooth. No fenestras or true vitta3. 



1. *S'. soUda, Waters, sp. PI. II., figs. 7, 8. 



C. sollda, "Waters, Quart. Journ. Geol. Soc, 1881, p. 318. 



Zooecia ovate or hroadly cuneiform ; a raised vertical band directed downwards 

 from the thyrostome ; the sides depressed and smooth and entire, or with a row of 

 pores ; lateral processes extending from the ujiper angles as an acute triangular 

 exjiansion with a conspiciious avicularium opening forAvards or outwards. Posterior 

 surface of the single zoojcia much dcjiressed, with an irregular central series of pores 

 and thickened margin on either side ; in the gemiuate zoa?cia a double ridge 

 separating the zooecia, and a raised central band down each zooecium especially 

 marked in the lower or primary ; surface imder the central band convex, and in 

 some specimens with an almost globular elevation. 



S.P., M.C., B., M. ; C.C. and W.P. (W.) 



It is difficult to place this form in any of the other divisions of the Catenicellidse 

 and I have, therefore, proposed a new genus for its reception. It differs from 

 Catenicella proper in the structure of the thyrostome, from Calpidium in the 

 peristome, although thickened, not presenting the lofty cucullate form of that 

 genus, and from both in the absence of fencstrtX} ; and from Claviporclla in the large 

 size of the zooecia and the presence of the peculiar raised bands. 



The globular posterior enlargement present in some specimens is very peculiar 

 and suggests the possibility of its beiug an ocecium, although the situation would 

 almost preclude that idea. 



Strophipora, n.y. 



Zooecia destitute of fcnestne or vitta3, with a vertical tliickened band descending 

 downwards from the thyrostome, and one or more similar bands on the posterior 

 surface ; thyrostome large, similar to that of Catenicella, arched above and straight 

 below. 



1. »S'. havceyi, Wyville Thomson, sp., Plate II., figs. 9-12. 



Catenicella Juwceijl, Wyv. Thomson, Dublin Nat. Ilist. llev., April, 1858, 

 p. 137 ; Waters, Q. J. G. S., Aug., 1883, p. 131. 



Zooecia ovate ; a vertical raised band extending directly downwards from the 

 middle of the lower margin of the thyrostome, dividing a short way down to enclose 

 a small circle aud again laiH ing ; a raised band separating the zoa'cia of a geminate 



D 



