EXPLANATION OF PLATE 20 



Fig. 1. Bursa mathewscnii (Gabb). No. 11209, Coll. Invert Palae. Univ. 

 Calif., loe. 1173. Natural size. 



Fig. 2. Bursa mathewsonii (Gabb). No. 11210, Coll. Invert. Palae. Univ. 

 Calif., loe. 2754. Natural size. 



Fig. 3. Natica (Neverita) recluziana andersoni, n. var. No. 11211, Coll. 

 Invert. Palae. Univ. Calif., loc. 2713. Natural size. 



Fig. 4. Molopophorus biplicaius (Gabb). No. 11158, Coll. Invert. Palae. 

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



Fig. 5. Searlesia dalli, n. sp. No. 11214, Coll. Invert. Palae. Univ. Calif., 

 loc. 2754. Natural size. 



Fig. 6. Molopophorus biplicaius (Gabb). No. 11152, Coll. Invert. Palae. 

 Univ. Calif., loe. 1131. Natural size. 



Fig. 7. Cyliolma ramone-nsis, n. sp. Type, no. 11218, Coll. Invert. Palae. 

 Univ. Calif., loc. 1131. Nearly three times natural size. 



Fig. 8. Molopophorus biplicatus (Gabb). Same specimen as fig. 4, natural 

 size. 



Fig. 9. Searlesia dalli, n. sp. No. 11214, Coll. Invert. Palae. Univ. Calif., 

 loc. 2754. Natural size. 



Fig. 10. Natica (Neverita) recluziana andersoni, n. var. Type, no. 11212, 

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



Fig. 11. Natica (Neverita) recluziana andersoni, n. var. Same specimen as 

 fig. 10. Natural size. 



Fig. 12. Natica (Neverita) recluziana andersoni, n. var. Same specimen as 

 fig. 3. Natural size. 



Fig. 13. Balanus sp. A. No. 11213, Coll. Invert. Palae. Univ. Calif., loc. 

 1162. Natural size. 



Fig. 14. Balanus sp. B. No. 11216, Coll. Invert. Palae. Univ. Calif., loc. 

 1131. Natural size. 



Fig. 15. Searlesia dalli, n. sp. Type, no. 11215, Coll. Invert. Palae. Univ. 

 Calif., loe. 2754. Natural size. 



Fig. 16. Epitonium pinolensis, n. sp. Type, no. 11273, Coll. Invert. Palae. 

 Univ. Calif., loc. 3055. Natural size. 



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