EXPLANATION OF PLATES. 
FIGURE. 
56, 58. Aspidoceras longispinum,Sowb. Jurassic, Hurope, 
57, 59. Stephanoceras Blagdeni, Sowb. Jurassic, Europe, 
PLATE 35. 
61, 62. Ammonites mamillaris, Schloth., 
63. eae bifrons, Brug. Lias, Europe, 
64. Coroniceras bisuleatus, Brug. Lias, Europe, : 
65, 66. Grammoceras serpentinus, Schloth. Jur., Europe, 
67. Schloenbachia cristatus, Deluc. Cret., Europe, 
68, 69. Ammonites cordatus, Sowb. Jurassic, Europe, 
70. Acanthoceras Rotomagense, Brong. Cret., Europe, 
71. Pinacoceras Metternichii. Trias, “Hallstadt, 
72. Ammonites. DD, ventral lobe; L, superior lateral lobes ; 
LI’, inferior lateral lobes; V, dorsal lobe; V’, its arms. 
73. Helicoceras Robertianus, d’Orb., 
74. Rhyncholites Astieriana, d’Orb., 
15. Conchorhynchus avirostris, Bronn, 
76. Conchorhynchus Owenii, Bronn, 
PLATE 36. 
717, 78. Ophioceras torus, d’Orb. Lias, Europe, 
79, 80. Asteroceras obtusus, Sowb. Lias, Europe, 
81, 82. Placenticeras placenta, DeKay. Cret., U.S., 
83, 84. Androgynoceras hybridum, Hyatt. Liassic, 
85. Lyparoceras Henleyi, Sowb. Lias, Europe, 
86. Mortoniceras Texanus, Romer. Cret., Texas, 
87, 88. Celoceras centaurus, d’Orb. Lias, Europe, 
89. Trachyceras Whitneyi, Gabb. Trias, California, 
90, 91. Gymnotoceras rotelliforme, Meek. Trias, Nevada, . 
92. Lobites delphinocephalus, Hauer. Trias, Europe, * 
93, 94. Cyclolobus Oldhami, Waagen. . Paleozoic, India, . 
PLATE 387. 
12. Acrochordiceras Hyatti, Meek. Trias, Nevada; 
6, 7. Entomoceras Laubei, Meek. Trias, Nevada, 
4, Eudiscoceras Gabbi, Meek. Trias, ‘Nevada, 
8, 9. Coroceras ellipticus, Hauer. Trias, Hallstaat, : 
10, 11. Prionotropis Woolgari, Mantell. ‘Cret., iby 8.1 Engl., 
2, 3. Psiloceras psilonotum, Quenst. Jurassic, Kur., 
100, 1. Arnioéeras Kridion, d’Orb. Jurassic, France, 
98, 99. Discoceras ophidigides, d’Orb. Jurassic, France, 
96, 97. Microceras biferum, Queenst. Jurassic, Europe, 
95. Deroceras ziphius, Ziet. Lias, Europe, ~~ 
PLATE 38. 
13, 14. Peronoceras muticus, @’Orb. — Lias, Europe, ¢ 
15, 16. Hamatoceras insignis, Schloth. Jurassic, Europe, . 
