18 A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 



pair ; tliyrostome with a thickened peristome and a denticle on each side ; a slightly 

 pointed lateral process on each side hearing an oval, elliptical or triangular 

 avicularium directed forwards or outwards. Posterior surface with a simple 

 vertical raised hand similar to that on the front. 



Var. porosa. A series of pores on each side of the raised band in front. 



Var. lata. Distinguished by its much greater width. 



S.P.; M.C.; B.; W.P. and B.ll. (W.) Dredged in Bass's Straits by Professor 

 Harvey, but, so far as I know, not since found living. 



Microstomaria, n.g. 



Zooecia small, without fenestras or vittse; tliyrostome small, nearly circular 

 and projecting forwards. 



1. M. tubulifera, n.sp. PI. II., fig. 29. 



The only specimen I have seen is the single geminate pair of zooecia figured. 

 The zooecia are very small, narrow, the surface with very minute perforated 

 papillae and faintly corrugated ; each outer angle is produced into a delicate 

 tubular process open at the extremity; there are no avicularia; the tliyrostome 

 is circular and almost tubular from the elevation of the peristome. 



M.C. 



The difference in the form of the thyrostome necessitates the formation of 

 a new genus for this minute species. It is possible that the tubular processes are 

 really avicularian. 



Caloporella, n.g. 



Zooecia small, mostly narrow and elongated; a lateral or anterior usually 

 linear depression (vitta of Busk) on each side, with a single or double series of 

 pores; tliyrostome small, subcircular or with the lower margin straighter and 

 usually having a small denticle on either side. 



I propose this genus for the Catenicellae vittatse of Busk. It differs from 

 Catenicella in the zooecia being small and usually narrow, in the absence of 

 fenestras and the presence of linear lateral narrow depressions usually perforated 

 by pores, and in the smaller size and more circular form of the tliyrostome. 



1. C. insignis, n.sp. PI. II., figs. 13, 14. 



Zooecia somewhat cuneatc; convex and smooth in front; vittae generally 

 narrow, but occasionally broader, lateral and extending the whole length; 



