EXPLANATION OF PLATES. 397 



FIGUBE. PAGB. 



56, 58. Aspidoceras longispinum, Sowb. Jurassic, Europe, 82 



57, 59. Stephanoceras Blagdeni, Sowb. Jurassic, Europe, 80 



Plate 35. 

 61, 62. Ammouites mamillaris, Scliloth., . . . .63 



63. Ammonites bitrons, Brug. Lias, Europe, . . .63 



64. Coroniceras bisulcatus, Brug. Lias, Europe, . . 75 



65. 66. Grammoceras serpentinus, Schloth. Jur., Europe, 18 



67. Schloenbachia cristatus, Deluc. Cret., Europe, . . 74 



68, 69. Ammonites cordatus, Sowb. Jurassic, Europe, . 63 

 70. Acanthoceras Rotomagense, Brong. Cret., Europe, . 83 

 7L Pinacoceras Metternichii. Trias, Hallstadt, . . 71 



72. Ammouites. Z>, ventral lobe ; L^ superior lateral lobes ; 



L', inferior lateral lobes ; F, dorsal lobe ; F', its arms. 



73. Helicoceras Robertiauus, d'Orb., 86 



74. Rhvncholites Astieriana, d'Orb., . . . . .60 



75. Conchorh^aichus avirostris, Broun, . . . .60 



76. Conchorhynchus Owenii, Broun, . ■ . . . .60 



Plate 36. 



77. 78. Ophioceras torus, d'Orb. Lias, Europe, . ^ . .75 

 79,80. Asteroceras obtusus, Sowb. Lias, Europe, . . 75 

 81,82. Placenticeras placenta, DeKay. Cret., IT. S., . .74 

 83, 84. Androgyuoceras liybridum, Hyatt. Liassic, . . 76 



85. Lyparoceras Henleyi, Sowb. Lias, Europe, . . .76 



86. Mortoniceras Texanus, Romer. Cret., Texas, . .74 

 87,88. Cceloceras centaurus, d'Orb. Lias, Europe, . . 81 



89. Trachj^ceras Whitneyi, Grabb. Trias, California, . , 69 



90, 91. Grymnotoceras rotelliforme. Meek. Trias, Nevada, . 70 



92. Lobites delphinoceplialus, Hauer. Trias, Europe, . 67 



93, 94. CyclololDus Oldhami, Waagen. Palaeozoic, India, . 66 



Plate 37. 



12. Acrochordiceras Hyatti, Meek. Trias, Nevada, . . 6,9 



6, 7. Entomoceras Laubei, Meek. Trias, Nevada, . . 68 



4, 5. Eudiscoceras G-abbi, Meek. Trias, Nevada, . . 75 



8, 9. Coroceras ellipticus, Hauer. Trias, Hallstadt, . . 71 



10, 11. Prionotropis Woolgari, Mantell. Cret., U. S., Engl., 73 



2, 3. Psiloceras psilonotum, Quenst. Jurassic, Eur., . . 76 



100, 1. Arnioceras Kridion, d'Orb. Jurassic, France, . 75 



98, 99. Diseoceras opliidioides, d'Orb. Jurassic, France, . 75 



96, 97. Microceras biferum, Queenst. Jurassic, Europe, . 76 



95. Derocei-as ziphius, Ziet. Lias, Europe, . . .76 



Plate 38. 

 13,14. Peronoceras muticus, d'Orb. Lias, Europe, . . 76 

 15, 16. Hamatocefas insignis, Schloth. Jurassic, Europe, . 78 



