402 Tertiary Formations. part it. 



3. Voluta alta, G. B. Sowerby, PI. IV. f. 75 (considered by M. 



d'Orbigny as distinct from the V. alta of S. Cruz). 

 1, Voluta triplicata, G. B. Sowerby, PI. IV. f. 71. 



5. Oliva dimidiata, do. PL IT. f. 76, 77. 



6. Pleurotoma discois* do. PI. IV. f. 51. 



7. Plenrotoma turbinelloides, do. PL IV. f. 53. 



8. Fusus subreflexus, do. PL IV. f. 57. 



9. Fusus pyruliforrnis, do. PL IV. f. 56. 



10. Fusus.. allied to F. regnlaris, PL IV. f. 55 (considered by M. 



d'Orbigny as a distinct species). 



11. Turrit elk suturalis, G. B. Sowerby, PL III. f. 50. 



12. Turritella Patagonica (do.), PL III. f. 18 (fragments of). 



13. Troehus laevis, G. B. Sowerby, PL III. f. 16, 17. 



11. Troehus collaris, do., PL III. f. i-i, 15 (considered by M. 

 d'Orbigny as the young of the T. lasvis). 



15. Cassis monilifer, G. B. Sowerbv, PL IV. f. 65. 



16. Pyrula distans, do.. PL IV. f. 61. 



17. Triton verruculosus, do., PL IV. f. 63. 



18. Sigaretus subglobosus, G. B. Sowerby, PL LIL f. 36, 37. 



19. Natica solida, do., PL III. f. 10, 11 (it is doubtful whether the 



X. solida of S. Cruz is the same species with this). 



20. Terebra undulifera, G. B. Sowerby, PL IV. f. 72, 73. 



21. Terebra costellata, do., PL IV. f. 70, 71. 



22. Bulla (fragments of). 



23. Dentalium giganteum, do., PL IT. f. 1. 

 21. Dentalium sulcosum, do., PL II. f. 2. 

 2.5. Corbis (?) laevigata, do., PL II. f. 11. 



26. Cardium multiradiatum, do., PL II. f. 16. 



27. Venus meridionalis, do., PL II. f. 13. 



28. Pectunculus dispar, (?) Desh. (considered by M. d'Orbigny as a 



distinct species). 



29. 30. Cythenea and Mactra, fragments of (considered by M. 



d'Orbigny as new species). 

 31. Pecten, fragments of. 



Coquimbo. — For more than 200 miles northward of 

 Xavidad, the coast consists of plutonic and metamorphic 

 rocks, with the exception of some quite insignificant 

 superficial beds of recent origin. At Tonguay, twenty- 

 five miles south of Coquimbo, tertiary beds recommence. 

 I have already minutely described in the ninth chapter, 

 the step-formed plains of Coquimbo, and the upper 

 calcareous beds (from twenty to thirty feet in thickness) 

 containing shells of recent species, but in different 

 proportions from those on the beach. There remains 

 to be described only the underlying ancient tertiary 



