ow 2 0) ee 7 
‘ 
PLATE 16 
All figures approximately natural size 
Fig. la. Monia machroschisma (Deshayes). Longitude 61 mm. 
Bolinas. Interior of upper, or left valve. 
Fig. 1b. Monia machroschisma (Deshayes). Longitude 61 mm. 
Bolinas. Interior of lower, or right valve. : 
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