Tertiary Folyzoa of Victoria. 69 



above the thyrostonie, and S. profunda is said to have about five. 

 Generally there are none, but I have found traces of them in 

 some of the infertile zooecia of the specimen figured, but had 

 I not specially looked for them they would not have been noticed. 

 The great depression in which the thyrostome is placed is a most 

 conspicuous feature in all the specimens, and in worn ones it is the 

 orAy characteristic visible. The ooecia are not mentioned by 

 either Dr. MacGillivray, or Mr. Waters. 



My specimen is from the Gellibrand River deposits. It is in 

 very good preservation, about half an inch long, broadly ligulate 

 in form, with a bifurcation, the zooecia are on both sides. There 

 are many large avicularia both between the zooecia and on the 

 margin of the zoarium : these have a longitudinally curved 

 mandible 0'5 mm. long, a crossbar with a central ligula and 

 sometimes two lateral ones also. The semicircular area behind the 

 crossbar is divided into two parts by another slightly curved 

 crossbar ; these, when broken, are probably what Mr. Waters 

 refers to as the large avicularia with " numerous denticles." The 

 oval avicularia have also a crossbar with a central ligula. There 

 are also a small circular avicularia scattei'ed over the surface. 

 The ooecia are large, globose and smooth. 



I have described the points in which S. profunda, and S. 

 fenestrata agree, and in which they diti'er at some length, because 

 without explanation their identify would not be perceived, for my 

 figure differs greatly from that given by Dr. MacGillivray ; his 

 does not show any avicularia, nor is the great depression in which 

 the thyrostonie is placed apparent. An examination of specimens 

 of S. profunda in the National Museum, confirms my conclusions ; 

 consequently that species must lapse. 



Schizoporella variabilis, n. sp. (PI. VIII., Fig. 12). 



Zoarium ligulate, apparently in short internodes. Zooecia on 

 both faces. Zooecia irregularly oval, surface either rugose or 

 mamillated. Thyrostome depressed, orbicular, with a rounded 

 sinus ; margin raised. Large avicularia situated below, or on one 

 side of the thyrostome ; occasionally a small oval avicularium 

 near the proximal part. Ooecia globose, subimmersed. 



Locality. — Aire Coastal Beds (Hall and Pritchard). 



