1893.] NEW YORK ACADEMY OF SCIENCES. 237 



MAPS, ETC., USED. 



Geological Map of the United States, published iti connection with the 

 9th U. S. Census, by C. H. Hitchcock and E. P. Blake. 

 Geological Map of New Jersey. Kept. Geol. Suiv. of N. J., 1882. 

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



Coast Survey Chart No. VIII. Approaches to New York. Gay Head 

 to Cape Henlopen. 



The Ancestors of the Tulip Tree (Plates LXI. and LXII. Bull. Torr. 

 Bot. Club, Jan. 1887) by J. S. Newberry. 



Flora Fossilis Aretica, Vols. VI. and VII. (Plates representing the fos- 

 sil flora of the L. Atane and Patoot beds), by Oswald Heer. 



United States Geological Survey, Vol. VI. (Cretaceous Flora), by Leo 

 Lesquereux. 



SPECIMENS SHOWN. 



White and colored clays, pyrite nodules and lignite. Glen Cove, L. I. 

 Plant remains in clay. North port, L.I. 

 Plant remains in sandstone, from the drift at Brooklyn, L. I. 

 Plant remains in concretions, from the drift near Glen Cove, L. I. 

 Plant remains in red shale, from clay outcrop on the shore near Glen 

 Cove, I. 



ON ANTENNAE AND OTHEE APPENDAGES OF TRI- 



ARTHRUS BECKII. 



UY W. 1). MATTHEW. 



(Plate VIII.) 



Among the problems whicli pala-oiitologists have in vaiu tried 

 to solve was, till a few years ago, that of tbe structure aucl 

 aflSnities of the trilobite. In all the vast numbers of these ani- 

 mals which have been found and studied, scarcely any ]iartH 

 have been 2)reserved, other than the dorsal shield and hyitostumc. 

 The legs, gills, etc., have practically never been shown on any 

 specimen. This is chiefly because of the easy break alTorded 

 by the hard, smooth carapace, but, i)artly also, because of the 

 character of these organs, which seem to have been soft, easily 

 disjointed, and prone to maceration and decay. The only cases, 

 as far as I know, in which the organs of the under side have 

 been definitely seen and described, are three specimens of 

 Asaphus- j)lahjcephalus in which a number of legs are preserved 



