EAST COAST MARINE SHELLS 



21 



or four one-hundredths of an inch. In the 

 plates of drawings, 60-73, derived from 

 Dall's Bulletin 37 of the U. S. National 

 Museum, the figures are life size, other- 

 wise the magnification or reduction is 

 shown on the plate itself. 



The length or width of specimens, 

 appearing on Plates 1 to 59 is Indicated in 

 many cases by a line, corresponding in 

 length to the over-all dimension of the 



shell. The presence of a line indicates 

 that the illustration is enlarged. The ab- 

 sence of a line indicates that the figure 

 is approximately natural size or else re- 

 duced. 



The term "Fig." together with a 

 numeral and no plate number Indicates a 

 reference to a figure in the text and not 

 upon a plate. 



