THE WENONAH. 101 



and Cylinchna recta, and to these may be added the following, 

 which occur also in the Marshalltown : Trigonia thoracic, Mere- 

 trix eufalenris and Actaeon cretacea, all of which are apparently 

 more truly members of the Marshalltown-Navesink fauna than 

 of the Wenonah. The great exogyras and gryphaeas, with 

 Ostreai fatfcata and Gryphaeostrea vomer, which are so abundant 

 in the Marshalltown and which either recur or are represented 

 by closely-allied species in the Mount Laurel-Navesink, are 

 entirely absent from the Wenonah. 



