EXPLANATION OF PLATE IX 
Eocene Fossils 
Fig. i. Mesodesnia alaskensis Dali; length 29.0 mm. ; p. 108. 
2. Nucula ( Acila ) decisa Conrad, internal cast, elongated by 
pressure ; length 30.0 mm.; p. 105. 
3. Crepidula precursor Dali; length 13.0 mm. ; p. no. 
4. Yoldia palachei Dali; length 29.0 mm. ; p. 104. 
5. Yoldia breweri Dali; height 18.0 mm. ; p. 105. 
6. Margarites peninsularis Dali ; height 12.0 mm. ; the basal 
part of this specimen is imbedded in a very hard matrix; 
p. no. 
7. Modiolus harrimani Dali; length 19.0 mm. ; p. 106. 
8. Yoldia emersonii Dali; length 18.5 mm.; p. 104. 
9. Spisula callistceformis Dali; length 50.o mm.; p. 108. 
10. Macrocallista ( Chionella P) gilberti Dali; length 42.0 mm.; 
p. 107. 
