MEMOIRS CF THE CARNEGIE MUSEUM, VOL.I PLATE XLII 
a? @ oe ae ‘ ( 
Glacrall 
(ee Preserve ay JI™ 
=<, am 
=| For 
fegieal | eee 
. —— 2 eee eees 
¢ pA sanboru )- p- 
wy == < 
ae , } 
®©&e686886 
ZS C. JNOpDAn quarns one i GENE: 
“Cxmmm al 
OG ONCKML 
Fig 1 Preglacial Monongahela Fig. 2. Range of C. obseurus& propinguus 
Fig. 3 Distribution of C. propinquus, propinquus canborni, obscurus 
