PLATE 31 
All figures approximately natural size 
Fig. la. Parapholas californica (Conrad). Longitude 134 mm. 
From a photograph of a living specimen collected by A. L. Barrows 
at Moss Beach, San Mateo County, California. Anterior view. 
Fig. 1b. Parapholas californica (Conrad). Exterior of left valve 
of the same specimen. 
Fig. 2a. Mya (Cryptomya) californica (Conrad). Longitude 25.5 
mm. Station D 5825. Exterior of left valve. 
Fig. 2b. Mya (Cryptomya) californica (Conrad). Interior of 
left valve. 
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