EXPLANATION OF PLATE 28 



All figures natural size. 



Fig. la. Spisula brevirostrata, n. sp. Pliocene. 

 Hinge of the type specimen. 



Fig. lb. Spisula brevirostrata, n. sp. Pliocene. 

 Exterior of the type specimen. 



Fig. 2. Spisula brevirostrata, n. sp. Pliocene. 



[346] 



