EXPLANATION OF PLATE 58 



Fig. 1. Chione pabloensis? n. sp. Left valve. Longitude, 85 mm. Natural 

 size. 



Fig. 2. CMone pabloensis, n. sp. Left valve. Longitude, 71 mm. Approxi- 

 mately natural size. 



Fig. 3. Spisula abscis.sa (Gabb). Reduced to less than one-half natural size. 



Fig. 4. Chione diabolensis, n. sp. Left valve. Longitude, 44 mm. Approxi- 

 mately natural size. 



[546] 



