142 



uncertainty the generic name employed has a note of interro- 

 gation affixed. 



The uppermost set of marine fossiliferous beds of the South 

 Australian Tertiaries is almost devoid of palliobranchs ; and 

 only in one locality — near Morgan, on the River Murray — have 

 specimens been gathered in a sufficiently good state of preser- 

 vation for accurate determination. The superior beds of the. 

 River Murray cliffs, or Upper Murravian, I have elsewhere 

 endeavoured to prove are contemporaneous with the celebrated 

 fossiliferous strata of Muddy Creek, in Victoria. In both of 

 of them the palliobranchs are all of small size, and are for the 

 most part dwarfed examples of species which have passed up 

 from lower horizons. The species in common are Waldheimia 

 Garibaldiana, W. Tateana, and Terebratulina Scoulari, all rare 

 and small. The Muddy Creek beds have yielded in addition — 

 Terebratulina Davidsoni, very rare and small ; Magasella Wood- 

 siana, small form, though not rare ; Bhynchonella squamosa, 

 very rare ; Thecidium australe and Waldheimia Oorioensis, rare. 

 In the basal beds of the Upper Murravian, about Blanchetown, 

 a large Waldheimia (W. MacLeani) is profusely abundant. 



The Middle Murravian beds contain Terebratulma Scoulari, 

 Waldheimia gigas, and W. Garibaldiana in great abundance. 



The Lower Murravian beds of the northern section of the 

 Lower Murray cliffs have not yielded any examples of the 

 class, except Magasella Woodsiana, at one locality only 

 (Moorundi, near Blanchetown), where it occurs in great plenty 

 and of large size. But in the cliffs about Mannum and on the 

 River Bremer palliobranchs occur in great variety and abun- 

 dance. The commoner forms are Terebratulina Davidsoni, 

 Magasella compta, M. Woodsiana, and Waldheimia (?) divaricata. 



In correlated beds we have in the white limestone at Mount 

 GTambier Magasella Woodsiana and Terebratulina Davidsoni in 

 abundance ; and in the yellow Polyzoal calcareous sands of 

 Aldinga Bay Magasella Woodsiana, var., and Waldheimia furcata 

 of infrequent occurrence. The Table Cape beds, Tasmania, are 

 probably not older than the above series ; and though the class 

 is represented in them by seven species, yet individuals seem 

 to be rare. 



Descending in the scale of our Tertiary deposits we encounter 

 in the glauconitic limestones of the cliffs in Aldinga Bay, and 

 in their probable representatives on the opposite shore of St. 

 Vincent's Gulf, and in the chalk of the Bunda Cliffs in the 

 Great Australian Bight, a palliobranch fauna with a facies very 

 distinct from that of higher horizons. The total number of 

 species collected from them is twenty-one, or seven-elevenths 

 of the known Australian Tertiary species. Of these fifteen do 

 not pass to higher stages of the formation. Many of the 



