[Proc. Rot. Soc. Victoria 35 (N.S.). Pt. I., 1922]. 



Art. I. — Ne%u or Little-known Fossils in the National 



Museum. 



XXV I. — Some Tertiary Mollusca. 



By FREDK. CHAPMAN, A.L.S. 



(Palaeontologist to the National Museum: Lecturer in Palaeontology^ 

 Melbourne University). 



(With Plates I-III.) 



[Read 20th April, 1922.] 



Introductory Note. 



The following paper deals with fourteen new species, and also- 

 discusses points of distribution in regard to eight other forms. 



A large portion of this collection has been donated to the National 

 Museum of late years by several indefatigable collectors, to whom 

 the authorities are much indebted. Groups other than mollusca have 

 been equally augmented, and they will be worked out as opportunity 

 permits. 



It will be seen by the present work that even as far back as 

 Oligocene and Miocene times there existed many species of mollusca 

 which are so closely related to living forms as to leave no doubt that 

 they were the direct ancestors of our present molluscan types. Others 

 have migrated from the Bassian area, and are now only found as. 

 varietal offshoots in warmer Australian waters. 



List of Species Described: — 



Pelecypoda. 

 Pteria (Meleagrina) crassicardia, Tate sp. 

 Ostrea ingens, Zittel. 

 Neotrigonia bednalli, Verco var. 

 Hinnites mulderi, sp. nov. 

 Plicatula youngi, sp. nov. 



„ dennanti, sp. nov. 



„ brevispina, sp. nov. 

 Spondylus baileyana, sp. nov. 

 Modiolus mooraboolensis, sp". nov. 

 Lucina (Codakia) planatella, Tate. 

 Diplodonta harrisi, sp. nov. 



Gasteropoda. 



Astralium (Imperator) hudsonianum, Johnston 

 Turbo grangensis, Pritchard. 



