VIII LIST OF ILLUSTRATIONS. 



XIV. Pelecypods: Cryptodon pyriformis, C. fucgiensis, C. ovoidens, Nucxda Yerrillii, Semele 

 nuculoides, Lucina leucosyma, Veneriglossa vesica, Limcea Bronniana, Limatula 



setifera, Lucina saqrinata, Veneriglossa vesica, Lucina sombrerensis 362 



XV. Ethnological Map of the Middle Atlantic Slope. Location ot Indian tribes in 1607 3G8 



XVI. Examples of fabrics impressed upon Pottery of the Potomac Valley 367 



XVII. Map of the District of Columbia, showing ancient village sites, etc 370 



XVIII. Kude chipped implements from the District of Columbia (half natural size) 370 



XIX. Rude chipped implements from the District i f Columbia (half natural size) 370 



XX. Paleolithic implements from the District of Columbia (half natural size) 373 



XXI. Paleolithic implements from the District of Columbia (half natural size) 374 



XXII. Harpeand clasper of species of TseniocampiniB 496 



XXIII. Harpe and clasper of species of Tasniocampinae 496 



DATES OF PUBLICATION OF AETICLES. 



Nos. 761-772, February 5, 1890; 773, March 7, 1890; 774. Mar^ 4, 1890; 775, March 4, 1890, advance 

 sheets issued December 10, 1889; 776, 777, March 7, 1890; 778, March 8, 1890; 779, April 21, 1890; 780, 

 April 21, 1890, advance sheets issued January 20, 1890; 782-786, May 22, 1890; 787-789, June—, 1890; 

 advance sheets of 787 issued March 4, 1890. 



LIST OF ERRATA. 



Page 85. The fourth paragraph should read : Dr. Theodor Pleske kindly writes me in 

 regard to the specimens in St. Petersburg: *'Our museum possesses two excel- 

 lent specimens of this species, both fully adult. One specimen was collected in 

 Bering Island by Wrangell, the other is of unknown origin." 



Page 369, line 3, for "Plates XVI, XVII" read " Plates XVIII, XIX." 



Page 369, line 13, for " Plate XVIII" read " Plate XVII." 



Page 369, line 34, for " Plate XIX" read " Plate XVI." 



