[Proc. Eoy. Soc. Victoria, 32 (N.S.), Pt. I., 1919]. 



Art. VI. — On an Ostracod and Shell Marl of Pleistocene Age 

 from Boneo Swamp, West of Cape Sehanck, Victoria. 



By FREDERICK CHAPMAN, A.L.S., F.R.M.S. 



(With Plates III. and IV). 



[Eead lOtli July, 1919]. 



Description of Deposit. 



The dried marl is of a -whitish-grey colour, but when wet is 

 grey to smoke-brown. It is light in weight and cavernous in 

 places, the holes being due to the roots and stems of plants, which 

 -have been enclosed in the deposit. 



The molluscan shells are mainly of freshwater types, belonging 

 to the genera BuUiniis and Coxiella, but the marine genus, Erycina, 

 is also well represented. 



Ostracoda are chiefly of aquatic character, as Cirpris and Cando- 

 nojjsis ; LiniTwcy there is a genus, which is' usually found in streams 

 and lakes, draining high land, and in close proximity to the sea; 

 Cythere (C . luhhockiana), though rare in this deposit, is a true 

 .marine ostracod. 



Under a high power of the microscope the fine washings are seen 

 to consist of minute rounded particles mingled with fragments of 

 ■ostracoda, and a few freshwater diatoms iCymhella). This genus 

 of diatomaceae has been previously recorded from several Vic- 

 torian localities of Pleistocene age, in deposits of a freshwater or 

 lacustrine nature, as those of Mickleham (^det. by author), Eglin- 

 ton, Amherst, Coralulup, Splitter's Creek, Rodborough, Belfast 

 and Talbot. 1 



The material is almost purely calcareous. On testing it for 

 phosphoric acid, no reaction was obtained. 



J. See Mahony, D. J. Bull, Geol. Surv. Vict., No. 26. 1912. pp. 12, 15 and 16. 



