100 Frederick Chapman: 



marked than in the Bohemian species. //. radians is found in the- 

 Lower Devonian (Stage F of Barrande). 



Occurrence. — Silurian (Yeringian). In olive-grey mudstone. 

 Junction of the Woori-Yallock and the Yarra. Collected by the 

 Geol. Surv. Vict. B23. 



EXPLANATION OF PLATES. 

 N.B. — All the photogi'aphic figures are enlarged one-sixth over 

 natural size. For exact dimensions, see text. 



Platk it. ' 



Fig. 1. — Helcionojisis nycteis, Cresswell sp. Side view of holo- 

 tyi^e. Cave Hill, Lilydale. 

 ,, 2. — Helcionopsis elegantuliim, sp. nov. Dorsal view of holo- 

 type. Cave Hill, Lilydale. 

 3. — //. elegantulum, sp. nov. Side view of holotype. 

 4. — Temmodisciis pharetroides, sp. nov. Lateral view of holo- 

 type. Loyola, near Mansfield. 

 5. — T. pharetroides, sp. nov. Back view of holotype. 

 6. — Bdlerophon fasciatus, Lindstrom. Side view. Junction 



of Woori-Yallock and Yarra. 

 7. — Bellerophon aff. fasiigiaftis, Lindstrom. Umbilical aspect. 



Kilmore. 

 8. — B. aff. fasiigiatus, Lindstrom. Oral aspect of same 



specimen. 

 9. — BelltropJion 2J?«i/77?, sp. nov. Umbilical aspect of holo- 

 type. Cave Hill, Lilydale. 

 10. — B. pisiim, sp. nov. . Oral aspect of holotype. 

 11. — B. pisvm. Dorsal view of holotype. 

 12. — Bellerojihon cresswelli, Etheridge fil. Side view of a. 



senile specimen. Cave Hill, Lilydale. 

 13. — Garinaropsis vicforiae, sp. nov. Interior of shell of para- 

 type, showing umbonal platform. Ruddock's, near 

 Lilydale. 

 14. — C vicforiae, sp. nov. Exterior of shell, holotype. Rud- 

 dock's, near Lilydale. 

 15. — Pleurotomaria niaccoi/i, sp. nov. Holotype, lateral 



aspect. Junction of Woori-Yallock and Yarra. 

 16. — P. ivaccoyi, sp. nov. Paratype. Shell showing slit-band. 



Junction of Woori-Yallock and Yarra. 

 17. — P. maccoi/i, sp. nov. Paratype, showing base of shelL 

 Junction of Woori-Yallock and Yarra. 



