GASTEROPODA OF TOE MIDDLE GREEN MARLS. 181 



as will be seen by reference to the figures. Mr. Gabb also seems to 

 have considered this as identical with those from Mullica Hill, as he men- 

 tions under the desription of that species "several specimens in the collec- 

 tion of the Academy from Timber Creek, New Jersey, with the surface 

 entirely obliterated." But he describes, imperfectly, the Mullica Hill 

 specimens. 



Formation and locality: The examples figured are both from Timber 

 Creek, and are from the Middle Marls. Only two individuals have been 

 noticed, one from the Acad. Nat. Sci., Phila., the other from Rutgers 

 College. 



Besides the species here given as pertaining to the middle marls there 

 are very many very imperfect casts of gasteropods among collections 

 made at the marl pits of J. S. Cook, Esq., near Tinton Falls, New Jersey, 

 which are too unsatisfactory for use. Among them may be mentioned a 

 Pyropsis-like cast, resembling P. verticalis, but more elevated; a Turbinopsis 

 resembling the young of T. major and one closely resembling T. curta; a 

 Turritella, possibly T. vertebroides Morton, a Natica, and several others. 



