166 Proceedings of the Royal Society of Victoria. 



Aturia austivalis, McCoy. 

 Sepia, n. sp. 



Of the 105 species of inollusca in the above list sixty-seven are 

 known from the lower beds, while thirty-eight are not previously 

 recorded from Spring Creek. Of the latter, fifteen are apparently 

 new species, and as far as we are aware are not known elsewhere. 

 Of the remainder which are specifically known eleven are common 

 at INIornington and in deposits at several other places which we 

 have associated with it. Six occur at Aldiiiga, five at Table 

 Cape, find one at River Murray cliffs. 



Summary. 



In our previous paper we undoubtedly attached too much 

 importance to the polyzoal limestones, and incorrectly grouped 

 together some which, as shown by the associated mollusoa, should 

 be placed on different horizons. Thus far we admit the force of 

 the objections raised by Messrs. Tate and Dennant. 



Tn default of molluscan fauna the positif)n of most of the 

 polyzoal rocks Ave mentioned is at present doubtful, but the 

 Waurn Ponds and North Belmont limestones should be associated 

 with the Spring Creek beds, while those at Upper Maude and 

 Batesford are closely allied, and should be refei-red together to 

 the Southern Moorabool Valley beds, which we ha\e grouped 

 with those of Lower Muddy Creek. 



The fact that the upper of the two zones at Spring Creek is 

 more nearly allied to the Muddy Creek beds than is the lower is 

 another piece of evidence, the importance of which cannot be 

 overlooked. 



We are unable to accept as correct the figures on uhich Messrs. 

 Tate and Dennant base the calculations adverse to our \iew of 

 the succession of the beds. 



On the main point in our earlier paper, namely, the relative 

 position of the Spring Creek, Muddy Creek, and older volcanic 

 rocks, our views are unchanged, and are leased in part on the 

 faunal agreement of the Lower Maude l^eds with those of Spring 

 Creek, and in part on a comparison of the fossils of the two 

 Spring Creek zones with those of other deposits. 



