PLATE XXVI. 



PAGE 



Fig. 22. Fusus tumidus. Magnified. 145 



Fig. 23. F. occidentals. Magnified. 146 



Fig. 24. Neptunea (Tritonofusus) cretacea. 146 



Fig. 25. N. mucronata. Natural size. 147 



Fig. 26. Paleatractus crassus. Magnified. 148 



Fig. 27. Surcula pr^eattenuata. Natural size. 150 



Fig. 28. S. (Surculites) sinuata. Natural size. 150 



Fig. 29. S. (Surculites) inconspicua. Magnified. 151 



Fig. 30. Heteroterma trochoidea. Magnified. 152 



30 a. Top view, showing the posterior sinus. 



Fig. 31. Bela clathrata. Magnified. 152 



Fig. 32. Cordiera MiTRiEFORMis. Magnified. 153 



Fig. 33. Tritonium Californicum. Magnified. 154 



Fig. 34. Trachytriton Tejonensis. Natural size. 154 



Fig. 35. Brachysphingus sinuatus. Natural size. 156 



Fig. 36. Bullia (Molopophorus) striata. Magnified. 157 



Fig. 37. Turbinella crassitesta. Natural size. 157 



