THE MERCHANTVILLE. 



61 



Besides the above list of species which have not as yet been 

 observed at all in the intermediate stages, the species of the fol- 

 lowing list fall into the same general category, their occurrence in 

 the intermediate stages being sporadic in nature, in all cases 

 being much less common in the intermediate formations than in 

 the Merchantville-Marshalltown-Navesink-Tinton horizons. 



The forms which are perhaps the most characteristic of the 

 Merchantville fauna and its recurrent phases, are Axinea subau- 

 stralis and the species of the genus Cucullaea, especially C. 

 antrosa, and as a matter of convenience this recurrent fauna may 

 be spoken of as the Cucullaea fauna. 



