OF MASSACHUSETTS. 



137 



D. Comparative Table of Size and Volume. 



In the following table of scallops from 1 to 80 millimeters for each 

 size (height), the average width and thickness are taken from the 

 measurements of many specimens. Height is the measurement along 

 the dorso-ventral axis, or from the hinge to the opposite edge of the 

 shell; width, along antero-posterior axis, or from the left to right 

 edge of the shell ; thickness, along the lateral axis, or the depth through 

 the valves. The cubic volume is expressed in cubic millimeters as 

 height times width times thickness. For each size the number per 

 quart is given in the fifth column. This table proved very useful in 

 determining the gain in volume in the planted beds and in the localities 

 under observation, as by merely having the original size and increase 

 in height, the gain in volume could be readily calculated. 



