Question : Shell morphometry (forum : 2015)

Hello, I am a newbie trying to understand the measurements for the cone shells.  Could you explain the following abbreviations or direct me to a site where they are explained:  I assume "L" is length.  Thanks.

Shell Morphometry  
L
50-104 mm 
RW
0.10-1.25 g/mm 
   (L 35-95 mm)
 RD
0.46-0.61 
PMD
0.85-0.95 
RSH
0.05-0.21


Answer (David Touitou)
Hello, Here is part of the answer :

SL : Shell length (maximum in mm)
RW : Relative Weight = Shell Weight (SW, g) / SL (mm)
RD : Relative Diameter = Maximum Diameter / Aperture Height (AH)
PMD : Position of Maximum Diameter = Height of Maximum Diameter / AH
RSH : Relative Spire Height = (SL-AH)/SL
S : Aperture Shape = Aperture Wide = AW/Aperture Lengh (AL)

Happy Shelling,
DAVID