THE MAGOTHY. 



41 



contrary, the total number of known species in the Merchant- 

 ville is greater than the entire known Woodbury fauna, and the 

 total fauna of the Mount Laurel-Navesink horizon is larger than 

 that of any other single formation in the series, being very much 

 larger than the fauna of either the Wenonah or the Red Bank, 

 although the faunas of each of these formations have much more 

 in common with the Cliffwood than does the Navesink fauna. 

 As will be shown later, there were two sharply marked alternating 

 faunas in the beds from the Clififwood to the Tinton inclusive. 



A notable proportion of the Clififwood species having a wider 

 range within the State, viz., 1 1 species of the total 26, distinctly 

 show the alternations in their occurrence, as follows : 



Nemodon hrevifrons 



Axinea congesta 



P-teria petrosa 



Mytilus oblivius 



Lucinia cretacea 



Isocardia cliifwoodensis . . . 



Cyprimeria cretacea 



Schizodesma appressa 



Turritella quadrilirata 



Anchura pergracilis 



Tetracarcinus subquadratus 



M 



W Ma 



X 



We 



N 



RB 



X 



To the above list might be added Nuculct whitHeldi, Cymella 

 belld and Cymbophora lintea, species which are much more con- 

 spicuous in these alternate faunas, but which- occur rarely in the 

 intermediate stages. It is, indeed, not improbable that at least 

 a portion of the species of the above list which are now known 

 exclusively in these alternating faunas, may be found to occur 

 rarely, with further collecting, in the intermediate beds, but the 

 fact remains, and probably will not be altered with the most 

 complete collections, that there is a -distinct faunal element which 

 is dominant in the Clififwood, Woodbury, Wenonah and Red 

 Bank faunas and which is inconspicuous in the Merchantville, 

 Marshalltown, Navesink and Tinton, while, on the other hand,- 

 as will be shown below, a dominant element is present in the 

 latter divisions which is not conspicuous in the former. 



