CONTENTS. 
ERBPACH = soot. GR S hs en eR ae Se ee el 
Law of Morphogenesis, viii. Organic Equivalence, viii. Morphological Equiva- 
lence, viii. Morphological Difference, ix. Acceleration in Development, ix. Gera- 
tology, ix. Acceleration in Degeneration, x. The Three Phases of Development, x. 
Law of Variation, x. Local Origin of Forms, xi. 
a Se ar Oe 
Origin and Characteristics of Suborders, 1-8. Nomenclature of the Stages of 
Growth and Decline, 8-21. Theory of Radicals and Morphological Equivalence in 
Progressive Forms, 21-28; in Retrogressive Forms, 28-40. Law of Acceleration, 
40-48. Origin of Differentials, 48-538. 
le INTBODUGHION. 25. 2-4 
elo GEN WATSOGN 0". Sg cen ye eee eee ea ce ea See ane arte) 
General Remarks, 54-56. Radical Stock, 57. Plicatus Stock, 57-62. Weehnero- 
ceran Series, 57. Schlotheimian Series, 57, 58. Caloceran Series, 58-61. Vermi- 
ceran Series, 61, 62. Levis Stock, 62-70. Arnioceran Series, 62, 63. Coroniceran 
Series, 63-65. Agassiceran Series, 65, 66. Asteroceran Series, 66-68. Oxynoticeran 
Series, 69, 70. Incerta Sedes, 70, note. 
TLE, SGENESIS OF CHARAGIERISNIOS 40 25 908 ce ee Rd 
Anagenesis, or the Genesis of Progressive Characteristics, 71-74. Catagenesis, or 
the Genesis of Retrogressive Characteristics, 74-80. Differential Characteristics, 
80-84. 
EV. GHOLOGICAD AND HAUNAL REDATIONS 90 2 0 oe SG 
Remarks, 85-89. Psiloceras and Caloceras, 89-93. Weehneroceras and Schlotheimia, 
93-95. Vermiceras, 95, 96. -Arnioceras, 96, 97. Coroniceras, 97-99. Agassiceras, 
99, 100. Asteroceras, 100, 101. Oxynoticeras, 101-103. Fauna of South Germany, 
Table I., 103. Fauna of the Cédte d’Or, Table II., 103, 104. Fauna of the Rhone 
Basin, Table III., 104-106. Fauna of England, Table IV., 106. Fauna of the Provy- 
ince of Central Europe, Table V., 106-108. Fauna of the Province of the Mediter- 
ranean, Table VI., 108-112. Summary, 112-119. 
V.. Duscriptions oF GENERA AND SPECInS OF ARIFTIDA ©... . 3. ) ..; 120-991 
Radical Stock, 120-125. First, or Psiloceran Branch, 120-125. Psiloceras, 120- 
124. T'megoceras, 125. Plicatus Stock, 125-161. Second, or Schlotheimian Branch, 
125-136. Wehneroceras, 125-127. Schlotheimia, 127, 128. Third, or Vermiceran 
Branch, 136-161. Caloceras, 136-154. Vermiceras, 154-161. Levis Stock, 161-221. 
Fourth, or Coroniceran Branch, 161-194. Arnioceras, 161-174. Coroniceras, 174-194. 
Fifth, or Agassiceran Branch, 194-214. Agassiceras, 194-200. Asteroceras, 200-214. 
Sixth, or Oxynoticeran Branch, 214-221. Oxynoticeras, 214-221. 
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INDEX 
