ioo CRETACEOUS PALEONTOLOGY. 



ANALYTICAL DISCUSSION OF THE WENONAH FAUNA. 



The data recorded in the preceding table may be summarized 

 as follows, 19 of the Wenonah species, or 23 per cent., not being: 

 recorded from any other horizon : 



Cliffwood, 19 



Merchantville, 35 



Woodbury, 35 



Marshalltown, 15 



WENONAH, 81 



Mt. Laurel-Navesink, 26 



Red Bank, 26 



Tinton, 10 



Ripley Group, etc., 50 



Although in this summary table the same number of Wen- 

 onah species seem to be present in both the Woodbury and the 

 Merchantville, the most characteristic members of the Cucullaea 

 fauna which are so abundant in the Merchantville are either ab- 

 sent, or are exceedingly rare in the Wenonah, and when this 

 fact is taken into consideration, the relationship of the Wenonah 

 fauna is seen to be much closer with the Woodbury than with 

 any other fauna in the entire series. This summary table also 

 shows the same number of Wenonah species common to the 

 Mount Laurel-Navesink and the Red Bank, although a later 

 table will show that a larger number of Red Bank species are 

 present in the Wenonah than in the Mount Laurel-Navesink 

 fauna. Here also, when the most highly characteristic and 

 abundant Mount Laurel-Navesink species are taken into account, 

 it is seen that they are conspicuous for their absence, or great 

 rarity, in the Wenonah, and in reality the fauna is much more 

 closely allied to the Red Bank than to the Mount Laurel-Nave- 

 sink fauna. 



Several of the species common to the Wenonah and the Mount 

 Laurel-Navesink appear for the first time in the Wenonah, and 

 do not persist, so far as has been observed, beyond the Navesink. 

 These species are : Pecten quinquenaria, L,ithophaga ripleyana, 

 Pyropsis retifer, Turbinopsis depressa, Turbinella alabamensis 



