New or L Ittle-knoiun Victorian Fossils. 63 



arranged in two series as in F. subantiqua, d'Orbigny and F. 

 antiqua, Goldfuss sp.; from four to six opposite each fenestrule. 

 Branches slender and somewhat sinuous ; sharply keeled ; bifur- 

 cating in an irregular manner, the angle often wide, the fission 

 taking place usually at every fourth fenestrule. External 

 surface non-poriferous ; branches with a rounded and fairly 

 smooth surface. 



Measurements. 



Height of zoarium, about 13 mm. 



Width of zoarium, about 10 nun. 



Diameter of zooecium, .08 mm. 



Average number of fenestrules in a length of 10 mm. = 8. 



Average number of fenestrules in a width of 10 mm. = 12. 



Affinities. — In F. morrisii from the Upper Palaeozoic of Burra- 

 good, New South Wales,^ we have a similar kind of branching, 

 hut the zooecial arrangement is not so regularly serial as in our 

 species, and the bi-anches have a feebly developed carina. The 

 nearest allied form to ours seems to be F. multiporata, de 

 Koninck (non McCoy),^ especially with reference to its strong 

 carina and regularly arranged pores. The fenestrules are, 

 however, elongate rectangular in the latter species, whilst in F. 

 australis they are sub-rectangular to sub-elliptical, and further, 

 the dissepiments in the latter form are wider. 



F. adraste, Hall and Simpson,'* from the Lower Helderberg 

 Group, near Clarksville, New York, bears close comparison with 

 our form ; the fenestrules, however, are smaller and more ovate, 

 whilst the zooecia are not so numerous, and the carina flattened 

 externally. 



Occurrence. — In the dark bluish limestone of Deep Creek, seven 

 miles to the south-east of Walhalla, Gippsland. The material 

 was collected and pre.sented by the Rev. A. W. Cresswell, M.A. 

 [•~)89-91]. Also figured specimen [1205a]. 



Horizon. — Silurian (Yeringian). 



1 McCoy, 1884, Syn. Carb. Foss. Ireland, p. 203, pi. xxviii., fig. 13. de Koninck, 1877, 

 Pal. Foss. New South Wales (Transl. by David and Dun, 1S98), p. 135, pi. vii., fip. 8. 



2 Op. cit., 1898, p. 134, pi. viii., fit;. 4. 



3 Natural History of New York, vol. vi., 18S7, p. 48, pi. xx., figs. 19-22. 



