EXPLANATION OF PLATE 11 



Fig. 1. Spisula occidentalis Gabb. View of right valve, no. 11106, Coll. 

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



Fig. 2. Callocardia (Agriopoma) calif ornica, n. sp. Type, no. 11107, Coll. 

 Invert. Palae. Univ. Calif., loc. 1131. Left valve, natural size. 



Fig. 3. Callocardia (Agriopoma) calif ornica, n. sp. Same specimen as fig. 2, 

 showing dorsal areas, natural size. 



Fig. 4. Callocardia (Agriopoma) calif ornica, n. sp. No. 11108, Coll. Invert. 

 Palae. Univ. Calif., loc. 1131. Left valve, natural size. 



Fig. 5. Leda pulchrisinuosa, n. sp. Type, no. 11109, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Approximately twice natural size; view showing dorsal 

 areas. 



Fig. 6. Leda pulchrisinuosa, n. sp. Same specimen as fig. 5, showing left 

 valve. Approximately twice natural size. 



Fig. 7. Pandora acutirostrata, n. sp. View of imperfect specimen of left 

 valve. No. 11112, Coll. Invert. Palae. Univ. Calif., loc. 1131. Natural size. 



Fig. 8. Mya (Cryptomya) incognita, n. sp. Type, no. 11114, Coll. Invert. 

 Palae. Univ. Calif., loc. 1131. Approximately twice natural size. 



Fig. 9. Pandora acutirostrata, n. sp. Type, no. 11111, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Approximately twice natural size. 



Fig. 10. Yoldia cooperi tenuissima, n. var. Type, no. 11110, Coll. Invert. 

 Palae. Univ. Calif., loc. 798. Natural size. 



Fig. 11. Callocardia (Agriopom-a) calif ornica, n. sp. View of hinge of left 

 valve. No. 11113, Coll. Invert. Palae. Univ. Calif., loe. 1131. Natural size. 



Fig. 12. Thracia condoni Dall. An immature individual; specimens are 

 usually much larger than this. No. 11277, Coll. Invert. Palae. Univ. Calif., loc. 

 1131. Natural size. 



Fig. 13. Pandora acutirostrata, n. sp. No. 11289, Coll. Invert. Palae. Univ. 

 Calif., loc. 1131. 



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