80 Frederick Cluqnnan : 



Occurrence. — Silurian (Yeringian). In l>rown mudstone, junc- 

 tion of the Woori-Yallock and the Yarra. Coll. of the Geol. Surv> 

 of Vict. (B23.) 



£elleropho7i aff. fastigiatus, Lindstroni. (Plate II., Figs. 7, 8). 



Bdlerophon fastigiatus, Lindstroni, 1884. Kongl. Svenska Vet.- 

 Akad, Handl., Bd. XIX., No. 6, p. 76, pi. VI., figs. 1-10. 



Observations. — A complete cast of *a subspherical Bellerophon 

 occurs in the Yeringian mudstone of Kilmore. In the moderate 

 compression of the dorsum, the faint keel and conspicuous and fairly- 

 narrow umbilicus, it is very close to Lindstrom's species from the 

 Silurian of Gotland. Probably better preserved specimens will 

 show it to be a new species allied to the northern one. 



Dimensions. — Greater diameter, 13.5 mm. ; shortest diameter, 

 11 mm. Width of aperture near base of Avhorl, 9.5 mm.; height of 

 aperture, 5 mm. 



Occurrence. — Silurian (Yeringian). Kilmore. Collected and 

 presented by Mr. G. Sweet, F.G.S. 



Bellerophon cresstvelli, Etlieridge fil. (Plate II., Fig. 12; Plate VI., 

 Fig. 53). 



Bellerojihon cresswelli, Etheridge, jnr., 1891. Kec. Aust. Mus., 

 vol. I., No. 7, p. 130, pi. XIX., figs. 6-8. 



Observations. — This species has already been compared with B, 

 squamosus, Lindstrom,! by Mr. Etheridge in his original descrip- 

 tion, Avhere he states that the shell is not fenestrate as in the 

 Gotland species. It is worth noting, however, that a well preserved 

 specimen in the National Museum shows a faint but definite lattice 

 structure of wavy striae across the growth-lines. The form of the 

 earlier portion of the shell is so distinctly globular that this feature 

 alone separates it from B. squamosus. 



Occurrence. — Silurian (Yeringian). In limestone, Cave Hill, 

 Lilydale. Collected by the Rev. A. W. Cresswell, M.A., and others. 



Bellerophon pisjan, sp. nov. (Plate II., Figs. 9-11). 



Descrijotion. — Shell almost globular, umbilical depression small,, 

 moderately deep. Aperture low, sub-crescentic, about four times- 

 as broad as high. Growth-lines making a widely open V in the 

 band area. Sinus band distinct, narrow, slightly raised from the 

 surface. Surface of shell marked with interrupted radial striae, 

 seen distinctly between the lines of growth. 



1 Kongl. Svenska Vet.-Akad. Handl., Bd. xix., No. 6, 1S84, p. 78, pi. v., figrs. 17-24. 



