GASTEROPODA OF THE 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. 8. 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 7. major and one closely resembling T. curta; a 
Turritella, possibly T. vertebroides Morton, a Natica, and several others. 
