104 TRANSACTIONS OF THE [FEB. 29, 



Concretions from Tottenvllle, Staten Island, containing molluscs and plant 



remains. 

 Concretions from Arrochar, Staten Island, containing molluscs. 

 Concretions from Tottenville, showing method of formation. 

 Glaciated stones from the drift at Tottenville. 

 Silicified fossils from the pre-glacial drift at Arrochar. 

 Dark cretaceous clay, containing lignite and plant remains, from Krelscher- 



ville, Staten Island. 

 Sandy clay, containing concretions, from Arrochar. 

 White cretaceous clay, from Arrochar. 



Sandy clay overlain by yellow sand, from a gravel pit at Clifton, Staten Island. 

 Cretaceous clay, containing lignite and pyrite, imbedded in bowlder drift, 



from Tottenville. 

 Cretaceous clay, imbedded in bowlder drift, from Kreischerville. 

 Stratified colored sands, overlying cretaceous clays, Kreischerville. 



MAPS, CHARTS, Etc., USED. 



Geological Map of the Vicinity of New York, by D. S. Martin, 1888. 



Geological Map of Staten Island and Adjacent Territory, U. S. Geol. Survey, 

 1888, 1«89. 



Geological Map of the Clay District of Middlesex Co., N. J., Geol. Survev of 

 N. J., 1877. 



Geological map of Staten Island, with sections across the island in the direc- 

 tion of glaciation, by the author. 



Mr. Heinrich Rees made the following remarks : — 



Concretions containing molluscan fossils were recently found by 

 Dr. Britton and myself along the shore of the Raritan River Just 

 west of Perth Amboy. They had been washed out of the creta- 

 ceous clays which outcrop at that point. In the absence of Prof. 

 Whitfield, Mr. L. P. Gratacap determined them for me as follows : — 



Corbida crassiplicn, Lam. 



Corbula, probably a new species. 



Corbida, a form intermediate between the two preceding, having the beak 

 more centrally situated. 



Cyprhneria sp. 



Pectunculus sp ? This genus has not, I believe, been hitherto described from 

 the cretaceous marls or ulays of N. J. 



Turritella sp ? 



Mr. Gratacap stated that all the specimens were much better than 

 many of those on which Prof. Whitfield based his descriptions in 

 ])reparing his work on the Lamellibrauchs of the New Jersey marls 

 and clays. 



