EXPLANATION OF PLATE 9 



Fig. 1. Macrocallista sp.? An internal mould. No. 11156, Coll. Invert. 

 Palae. Univ. Calif., loc. 14. Natural size. 



Fig. 2. Macrocallista? incognita, n. sp. Type, no. 11116, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Natural size. 



Fig. 3. Macrocallista? incognita, n. sp. Same specimen as fig. 2, view show- 

 ing dorsal areas. Natural size. 



Fig. 4. Spisula ramonensis Packard. Type, no. 11118, Coll. Invert. Palae. 

 Univ. Calif., loc. 1687. Natural size. 



Fig. 5. Spisula ramonensis Packard. An exterior cast of left valve. No. 

 11117, Coll. Invert. Palae. Univ. Calif., loc. 1458. Natural size. 



Fig. 6. Spisula ramonensis attenuata, n. var. Type, no. 11119, Coll. Invert. 

 Palae. Univ. Calif., loc. 1167. Natural size. 



Fig. 7. Metis rostellata, n. sp. Imperfect specimen of left valve, no. 11120, 

 Coll. Invert. Palae. Univ. Calif., loc. 1131. Natural size. 



Fig. 8. Modiolus kirl-erensis, n. sp. Type, no. 11121, Coll. Invert. Palae. 

 Univ. Calif., loc. 3081. Natural size. 



Fig. 9. Modiolus pittsburg crisis, n. sp. Type, no. 11122, Coll. Invert. Palae. 

 Univ. Calif., loc. 1895. Natural size. 



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