INDEX. 



Fossil Hill, Nevada, 18, 19, pi. 1, fig. 1. 



Fraas, E., acknowledgment of assistance, 6; cited, 



10, 12, 13, 28, 30, 49, 1)5, TO, 80, 90, 91, 93, 94, 

 102, 103. 



Freyburg a.U., 13. 



Furlong, E. L., acknowledgment of assistance, 6. 



Gegenbaur, ('., cited, 7(i. 



Geographic occurrence, 12; outline maps, 13, 15. 



America, 14; outline map, 15. 



Europe, 12. 



Xew Zealand, 14. 



Spitzbergen, 14. 



Geologic and geographic occurrence, 12. 

 Geologic occurrence, 12. 



America, 14. 



Europe, 12. 



New Zealand, 14. 



Spitzbergen, 14. 

 Geosaurus, caudal fin of, 44. 

 Gilmore, C. W., cited, 23, 24, 83, 106, 107, 111. 

 Goddard, M., cited, 19. 

 Grossreifling, 13. 

 Haeckel, E., cited, 76. 

 Halle a.S., museum of, 12, 13. 

 Harz, 13. . 

 Hector, J., cited, 14, 154. 

 Heim, A., acknowledgment of assistance, 6. 

 Historical review of literature, 9. 

 Holland, W. J., acknowledgment of assistance, 6. 

 Hosselkus Limestone, 15, 16, 17, 129, 131, 137, 138, 



142 ; pi. 1, figs. 2 and 3. 

 Huene, F. von, acknowledgment of assistance, 6; cited, 



11, 14, 60, 102, 154, 155. 



Hulke I. W., cited, 10, 14, 138, 148, 149, 150. 

 Ichthyosauridae, 82, 87, 89. 

 Ichthyosaurinae, 87, 88, 90. 

 Ichthyosaurus, 152. 

 Ichthyosaurus, sp., 154. 

 Ichthyosaurus acutirostris, 39, 69. 

 Ichthyosaurus carinatus, 14, 153. 

 Ichthyosaurus communis, 58, 61, 69. 

 Ichthyosaurus extremus, 69. 

 Ichthyosaurus ( ?) hectori, 154. 

 Ichthyosaurus intermedius, 43, 69. 

 Ichthyosaurus longifrons, 38. 

 Ichthyosaurus nordenskibldii, 10, 148. 

 Ichthyosaurus platydactylus, 38, 69. 

 Ichthyosaurus polaris, 10, 11, 149. 

 Ichthyosaurus quadriscissus, 36, 43, 60, 69. 

 Ichthyosaurus( ?) rheticus, 153, 154. 

 Ichthyosaurus, sensu stricto, 80. 

 Ichthyosaurus trigonus posthumus, 40. 

 Idaho, Lower Triassic of, 19. 

 Indian Canon, Nevada, 18. 

 Jaeckel, O., cited, 80. 

 Jena, museum of, 13. 



.Jordan, D. S., cited, 17. 



Kadaliosaurus, rib articulation of, 51. 



Ktprijanoff, W., cited, 31, 80. 



Knight, \V. C., cited, 37. 



Kossner beds, 9, 14. 



Koken, E., acknowledgment of assistance, (i; cited, 57. 



Larishof, 9. 



Latipinnati, 80. 



Laufenberg, Wellemloloinit of, 13. 



Leidy, J., cited, 9, 19, 104. 



Leptocheirus, 12, 129. 



Limbs, general structure of, (>,'!. 



Cymbospondylus, 65. 



Delphinosaurus. "i'l. 



.Mcrriamia, 71. 



Mixosaurus, 65. 



Shastasaurus, 72. 



Toretoenemus, 71. 

 Limb-arches, general structure of, 54. 



Pectoral arch, 58. 



Pelvic arch, 54. 



Literature on Triassic Iclithyosauria, 7; historical re- 

 view of, 9. 

 Longipinnati, 80. 

 Lower Triassic of America, 19; of eastern California, 



19; of southeastern Idaho, 19. 

 Lydckker, R., cited, 68, 80, 154, 155. 

 McGregor, J. H., cited, 24, 33, 77, 78, 1(17. 

 Merriam cited, 11, 12, 14, 17, 18, 83, 119. Mo. 

 Merriamia, 27, 28, 129. 

 Mcrriamia zitteli, 129, 26, 59, 64, 66, 130. 

 Meyer, H. von, cited, 9, 13, 14, 30. 

 Middle Triassic, 18; of Nevada, pi. 1, fig. 1; charac- 

 teristic species of, 18, 19. 

 Milan, civic museum, specimens in, 30, 41, 50, 70, 95, 



96, 97, 98, 99, 101. 

 .Mlxosauridae, 83, 87, 89. 

 Mixosauridae of uncertain position, 148. 



Cymbospondylus (?) natans, 150. 



Cymbospondylus(?) nordenskioldii, 148. 



Cymbospondylus (?) polaris, 149. 

 Mixosaurinae, 87, 89. 

 Mixosaurus, 94. 

 Mixosaurus(f) atavus, 90; 28, 35, 50, 60. 92. 



Jaws and dentition, 94. 



Limb and arch elements, 94. 



Vertebral column, 90. 



Mixosaurus cornalianus, 95; 28, 42, 49, 56, 59, CO, 64, 

 66, 70, 96, 100, 151. 



Classification, 103. 



Dentition, 103. 



Extremities, 99. 



Limb arches, 101. 



Ribs, 98. 



Skull, 102. 



Vertebral column, 96. 



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