No i v.] AMBER IN EASTERN UNITED STATES. 145 



tion with the leafy twigs of Sequoia heterophylla Vel., and 5. 

 rcichenbachi (Gein.) Heer. It may also be of interest to note- 

 that leaves of Sequoia arc said to be associated with the amber 

 of Japan. 



Other coniferous remains which have been found in the 

 Kreischerville clays, and which may have contributed to our 

 supply of amber, are Widdringtonitcs reichii (Ett.) Heer., Jnni- 

 perus hypnoides Heer, Dammara microlepis Heer., and Pinus sp. 

 The genus Dammara is prominently represented in our living 

 flora by D. australis Lamb, the well known "Kauri " gum tree 

 ot Australia. Its former existence, however, as an element in 

 the Cretaceous flora of North America, is somewhat problematic, 

 and is based entirely upon the pres nee ot certain small cone 

 scales, the exact botanical affinities of which have never been 

 satisfactorily determined. The occurrence of remains oi the 

 genus Pinus is more significant perhaps tl an any of the other 

 three last mentioned, by reason of the fact that the typical 

 amber of the Baltic provinces in Europe is recognized as a prod- 

 uct of the extinct Tertiary species, P. succinifera (Goepp.) 

 Conw. 



Acknowledgments. 



For answers to letters of inquiry on my part I am indebted 

 to Dr. Lester F. Ward and Dr. F. II. Knowlton of the United 

 States National Museum, Mr. A. Bibbins of the Woman's Col- 

 lege <>f Baltimore, Mr. L. P. Gratacap and Mr. Barnum Brown 

 of the American Museum of Natural History, and to Mr. Deo. 

 F. Kunz, of the United States Geological Survey. 



