EXPLANATION OF PLATE 27 



Fig. 1. Spisula ashburnerii (Gabb). x 2. Cretaceous. 



Fig. 2. Spisula gabbiana (F. M. Anderson), x 1. Cretaceous. 

 Exterior of the type. (After Anderson). 



Fig. 3. Spisula merriami, n. sp. x 2. Eocene. 



Fig. 4. Spisula merriami, n. sp. x 2. Eocene. 



Fig. 5. Spisula tejonensis, n. sp. x 2. Eocene. 



Fig. 6. Spisula chicoensis, n. name, x 1. Cretaceous. 



Fig. 7. Spisula chicoensis, n. name, x 1. Cretaceous. 

 Hinge of left valve. 



Fig. 8. Sj)isula coalingensis (Arnold), x 1. Pliocene. 



Fig. 9. Spisula (?) ueaveri Packard, x 1. Eocene. 



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