A MONOGRAPH OF THE TERTIARY POLTZOA OE VICTORIA. 17 



as to have a hastate form. Posterior surface with a grooved vertical ridge, on each 

 side of which it is smooth. No fenestra or true vittse. 



1. S. solida, Waters, sp. PL II., figs. 7, 8. 



C. solida, Waters, Quart. Journ. Geol. Soc, 1881, p. 318. 



Zooecia ovate or broadly 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 upper angles as an acute triangular 

 expansion with a conspicuous avicularium opening forwards or outwards. Posterior 

 surface of the single zooecia much depressed, with an irregular central series of pores 

 and thickened margin on either side; in the geminate zooecia a double ridge 

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

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

 some specimens with an almost globular elevation. 



S.P., M.C., B., M. ; O.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 fenestrse ; and from Claviporella 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 being an ocecium, although the situation would 

 almost preclude that idea. 



Strophipora, n.g. 



Zooecia destitute of fenestras or vittae, with a vertical thickened 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. harveyi, Wyville Thomson, sp., Plate II., figs. 9-12. 



Catenicella harveyi, Wyv. Thomson, Dublin Nat. Hist. Pev., April, 1858, 

 p. 137 ; Waters, Q. J. G. S., Aug., 1883, p. 431. 



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 and again uniting ; a raised band separating the zocecia of a geminate 



