54 LISTA DE GENEROS Y ESPECIES 
Inoceramus tenuirostris, 34. 
— truncatus, 32, nota. 
= Vanuxemi, 29, 34, 35. 
SS Zitteli, 29. 
Libycoceras, 21, 22. 
=— Chargense, 21. 
Lima britannica, 40. 
— Coahuilensis, 15, 39. 
— interplicosa, 15. 39, 40. 
— Utahensis, 89. 
Metoecoceras Geslianum, 14, nota. 
— sp. 14, nota. 
— Whitei, 14, nota. 
Mammites Mohovanensis, 13, nota. 
— nodosoides, 13, nota. 
Mantellum Coahuilense, 39. 
Myjtilites problematicus, 25. 
Neoptychites cephalotus, 13, nota. 
= Xetriformis, 18, nota. 
Ostracites labiatus, 25. 
Ostrea acutirostris, 45, 46. 
—  Ameghinoi, 47. 
—  arcuatilis, 43. 
—  Arizpensis, 16, 48. 
—  bellaplicata, 12, 48. 
—  Blackii, 12, 48. 
—  Bomilcaris, 47. 
—  Ccrenul'margo, 50. 
—  Cristatula, 16, 49. 
—  curvirostris, 45. 
—  divaricata, 47. 
—  Forgemoli, 49. 
= — var. Tissoti, 49. 
— glabra, 13, 16, 18, 43. 
— — var. Wyomingensis, 15, 50, 
51. 
—  Haitensis, 50. 
—  incurva, 16, 18, 45. 
= = var. acutirostris, 16, 45. 
—  insecuris, 43. , 
— —lugubris, 11, 12, 17, ¿/7. 
—  macroptera, 48. 
—  Morgani, 16, 49. 
Ostrea punica, 44. 
—  quadriplicata, 50. 
—  rocana, 47. 
—  Saltillensis, 15, 46. 
—  Scaniensis, 45. 
—  selleeformis, 47. 
—  semiplana, 48. 
—  subtrigonalis, 45, 46. 
—  sulcata, 48. 
—  Veatchii, 50. 
—  Wyomingensis, 43. 
Pachydiscus flaccidicosta, 12, 19. 
= peramplus, 12, 19, 33. 
— sp. ind., 19. 
Placenticeras, 22. 
= lenticulare, 20, 
Pseudaspidoceras Footeanum, 15, nota. 
= Pedroanum, 14, nota. 
Ptychodus Whipleyi, 11. 
Sphenodiscus, 16, 20 y sig. 
= acutodorsatus, 20, 21, 22. 
= Binkhorsti, 20, 21, 24. 
=— Ismaelis, 21. 
— Konincki, 16, 24. 
— lenticularis, 15, 16, 20. 
— lobatus, 23. 
= Requieni, 20, 22. 
— Rutoti, 20, 21. 
= . Siva, 16, 20, 21, 24. 
= Ubaghsi, 20, 21. 
Tylostoma ovatum, 13, nota. 
Vascoceras Adonense, 14, nota. 
= Angermanni, 13, nota. 
= Gamai, 13, nota. 
= Mohovanense, 13, nota. 
— polymorphum, 13, nota. 
= sp., 13, nota, 
Volutilithes, 25. 
= Arizpensis, 15, 24, 51. 
Volutoderma Arizpensis, 25. 
Volutomorpha, 25. 
= Arizpensis, 25. 
