310 Frederick Cliapman : 



J. W. Davis.i Certain other typical fossils of the Oamarii 

 Series are also common to the Janjiikian of southern Australia, 

 and the Oamaru Stone horizon in particular appears to be 

 homotaxial with the Batesford Limestone. A recent Avriter on 

 this subject, Prof. J. Park,2 has summarised the latest evidence, 

 both stratigraphical and palaeontological, and he places the 

 Oamaru Stone in the Miocene, at about the middle of that 

 series. This opinion independently supports my own conclusion 

 as to the age of the P>atesford beds. Besides the species of 

 shark just mentioned, both the Mount Brown Beds and the 

 \mderlying Oamaru Stone contain the remarkable cetacean 

 type, Kelxtnodon onomata, Hector, which, from the structure of 

 the fangs and the rounded contour of the crowns of the molars 

 are undoubtedly of the squalodont form, although the species 

 has always been referred to as a zeuglodont. In his description 

 of this fossil, Hector, however, does state that the New Zealand 

 teeth resemble, amongst other genera, those of Squalodoii} 

 The Janjukian of Waurn Ponds, and Castle Cove, Cape Otway, 

 occasionally yield the teeth of Squalodon wilkinsoni : and 

 these show a close relationship with the New Zealand fossils. 

 with the exception that the latter are much larger, and the 

 canines more trenchant and strongly curved. Moreover, from 

 the Oamaru Series at White Rock River Quarry, N.Z., Davis 

 has described a denticulated tooth of a true squalodont, 

 which he refers to a new species, Squalodon serratus,^ at the 

 same time remarking that it shows great relationship with 

 McCoy's S. wilkinsoni. The molar tooth from the polyzoal 

 rock of Mt. Gambler, named Zeuglodon harvuiodi by Mr. E. B. 

 Sanger, is also closely related, if not identical with the \\q- 

 torian Squalodon.^ In its bearing on the age of the Janjukian 

 it is interesting to note that the genus is typical of the Miocene 

 series of France and I>avai"ia, and reiuaiiis have also been found in 

 European Pliocene strata. The pennatulid (Tra/phularia, is an- 

 other guide-fossil common to the Middle Oamaru Series and tlie 



1 Trans. K. Duhl. Soc-., ser. ii., vol. iv., 18SS, p. '20, ).]. iv., (i-^s. 1-3. 



•2 Trans, and I'roc. N.Z. Institute, vol. wxvii, il't(i4), llKi.'., pp. 4M)-.".:.l. 



3 Ibid, vol. xx\. (1880), ISiSl, i). 43;'). 



4 Trans. R. Duhl. Soc, ser. ii., vol. iv., ISSS, i>. 4, pi. \ii., tij;-. !>. 

 :> Proc. Linn. Soc. N.S. Wales, vol. v., 1881, p. 2118. 



