On a Deposit of Diatomacea at South Yarra. 163 



iiodulc; margin of the valve liaving fine markiugs^ direct and 

 oblique; diameter of frustulc .0111 to .0074. 



2. Actinoeyclus duodeiiarius. 



3. Cosciiiodiscus radiatus. 



4. Cosciiiodiscus cceentricus. 



5. Camiiylodiscus clypeus. 



6. Campylodiscus cribrosus. 



7. Campylodiscus Hodgsonii. 



8. Campylodiscus parvulus. 



9. Stauroneis puleliella. 



10. Stauroneis acuta. 



11. Plydrosera triquctra (rare). 

 1.2. Navieula eliiptica. 



13. Navieula ovalis. 



14. Navieula Amphisboena. 



15. Navieula tumens. 



16. Navieula pusilla. 



17. Navieula minutula. 



18. Navieula (new variety). Valve elliptical, extremities 

 rounded, striae transverse in lateral and two narrow central 

 bands, delicate, 34 in. 001". 



19. Pinnularia nobiiis. 



20. Pinnularia major. 



21. Pinnularia stauroneiformis. 



22. Pinnularia distans. 



23. Pinnularia acuminata. 



24. Ortliosira marina. 



25. Mclosira ■ 



26. Hyalodiseus subtilis. Valve having a central granu- 

 lated disc, with clear transparent margin, Avitli fine decussat- 

 ing markings ; diameter .01 to .0074. 



27. Pleurosigma Baltieum. 



28. Pleurosigma • 



29. Pleui'osigma 



30. SurrireUa splendida. 



31. SurrireUa striatula. 



32. Gomphonema lanceolatum. 



33. Gomyjlionema eymbiforme. 



34. Epithcmia turgida. 



35. Epithemia ^^'esternannii. 



36. Himantidium arcnt. 



37. Ilimantidiuin nndulatum. 



38. Himantidium bideus. 



39. Himantidium gracile. 



M 2 



