6 Proceedings of the Royal Society of Victoria. 



Locality. — Mornington. (T. S. Hall). 



This is allied to S. tenuis, but the lateral processes are very- 

 much more produced upwards into long retrocedent rostra which 

 arise from the dorsal surface of the lateral processes. 



The species of the preceding genus are characterised by having 

 segregated, round, fenestrje as distinguished from the aggregated, 

 pyriform fenestrte of Catenicellce. I have found a form, which 

 possesses both kinds, for which it is necessary to establish a new 

 genus, and on examination of my slides of recent polyzoa to 

 compare with the fossils I discovered I have another species 

 which will be described in a separate paper. 



Digenopopa, n. gen. 



Zocecia with two sets of pores or fenestne, one set submarginal, 

 segregated, oval or round ; the other set, on the front of the 

 zocecia below the thyrostome, pyriform. 



Digenopopa compta, n. sp. (PL I., Figs. 10 and 10^). 



Characters as for genus. Zofficia ovate and ventricose, 7'9 

 pyriform fenestra? on the front ; 9'13 oval or round perforations 

 outside the inner group. Large sessile avicularia at upper 

 angles of the Zocecia. 



Localities. — Bairnsdale (J. Dennant) ; Mornington and Muddy 

 Creek (T. S. Hall). 



The geminate pair is from the Mitchell River near Baiinsdale, 

 the single zocecium is from Mornington and I have another single 

 zotecium, which, though slightly smaller, I consider belongs to 

 this species, from Muddy Creek, I had at tirst supposed each of 

 them to be of different species, seeing they came from places so 

 wide apart, but there is not sufficient difference between them 

 to warrant their separation. It will be seen that the zocecia of 

 the geminate pair are not exactly the same as the single zocecium, 

 but there is not more difierence than often occurs between 

 geminate and single zocecia of other species. 



The specimens of recent Catenicella ciibraria in my cabinet 

 show, I think, that that species probably should be relegated to 

 this genus, as the marginal fenestne are circular and decidedly 

 larger than those on the middle of the zocecia, but the latter are 



