94 THE AMERICAN MIDLAND NATURALIST < 
FLAT EW 
Fig ure i. Figure wb 
Chitinous rods as they appear Chilinous reds as the 
in’ marine Palyce rae appear in the Nayades 
Afrer Peck . 
Didgrants Tolshow Tieidifferenccin position and form of the chilinous rods in 
the CL ees of marine and fresh-waier Lamelbraachs 
