EXPLANATION OF PLATE XII. 
Figure 1. QUuADRULA UNDULATA Barnes. Undulations 
almost obsolete. 
Figure 2. QuaDRULA LACHRYMOSA Léa. 
i 
? 
‘* 4. LaMPSILIS VENTRICOSUS Barnes. J 
oe _ 
5. LAMPSILIS VENTRICOSUS Barnes. 
ss 3. LAMPSILIS VENTRICOSUs Barnes. 
24 natural diameter. 
