Tertiary Polyzoa of Victoria. 209 



infertile zooecia show a denticle on each side giving it somewhat 

 the appearance of a Schizoporella ; this is not mentioned by Mr. 

 Waters, nor shown in his figure. 



Leppalia costata, n. sp. (PI. XXXV., Fig. 12). 



Zooecia elongated, hexagonal with broad very highly raised 

 margins ; surface depressed and concave, with a few scattered 

 pores. Thyrostome oval, with a denticle on each side, situated 

 at the upper extremity of the zooecia and at the junction of the 

 raised margins, the narrow portion of the ridges of which divide 

 and surround the thyrostome. Ooecia immersed, with very large 

 semicircular aperture. 



Locality. — Mitchell River (J. Dennant). 



This I thought at first to be merely a variety of L. burlingtoji- 

 iensis, as the chief distinction in those specimens with no ooecia 

 was that the surface of the zooecia was concave, not convex, and 

 the marginal ridges were very prominent ; but wiien I found a 

 specimen with an ooecial aperture it proved to be a different 

 species. The ooecia appear to be wholly immersed, the aperture 

 only showing. 



Lepralia clavata, n. sp. (PI. XXXV., Fig. 13). 



Zoarium cylindrical, clavate. Zooecia diamond shaped ; 

 margins narrow, raised ; surface convex, smooth. Thyrostome 

 oval, at the upper extremity of the zooecia and at the junction 

 of the margins. Ooecia large, globose, subrotund, with two 

 irregular rows of rather large pores ; aperture broad, arched 

 above, concave below. Fertile zooecia with a few scattered pores. 



Z^^a/Z/j.— Clifton Bank, Muddy Creek (T. S. Hall). 



This is evidently closely allied to L. biirlingtonioisis, but the 

 infertile zooecia have no pores and the ooecia are very much 

 larger than the zooecia. There is a small cylindrical structure 

 extruding from the thyrostome of the zooecium immediately 

 below the fertile zooecium, but what it is I cannot say, it is 

 evidently a parasitic growth. 



Leppalia radiata, n. sp. (PI. XXXY., Fig. 14). 

 Zoarium incrusting. Zooecia broad, irregularly hexagonal, 

 distinct, with narrow raised margins ; surface convex, with 



3a 



