PLATE 32 
All figures approximately natural size 
Fig. 1. Zirfaea gabbi Tryon. Longitude 56 mm. Exterior of 
left valve, showing siphons extended. 
Fig. 2a. Parapholas californica (Conrad). longitude 134 mm. 
From a photograph of a living specimen collected by Mr. A. L. 
Barrows at Moss Beach, San Mateo County. Ventral aspect. 
Fig. 2b. Parapholas californica (Conrad). Dorsal aspect of same 
specimen. 
[396] 
