236 INDEX. 
a6 
Schlotheimia D’Orbigniana, 94, 95, 133. 
extranodosa, 154. 
Geyeri, 135. 
lacunata, 135. 
Jacunatus, Gey., 135. 
Leigneletii, 94. 
Leigneletii, Wih., 132, 133. 
marmorea, 134. 
montana, Wih., 184. 
Moreana, 93, 128. 
pachygaster, 134. 
posttaurina, 134. 
Quenstedti, Gey., 185. 
rotunda, 135. 
scolioptycha, 134. 
striatissima, 129. 
Speziana, Can., 136. 
trapezoidale, 134. 
taurina, 134. 
ventricosa, 128, 133, 134. 
Schlotheimian Series, 57, 105, 106, 122. 
Schliiter, 92, 94, 97, 98, 101. 
Schwartz, 2, 14, 216. 
Scipionis Bed, 108, 176. 
Scotland, 88. 
Secondary Radical, 3, 22, 71. 
Seebach, 94, 114. 
Selection, physical, ix, 52. 
Semper, 8, 30. 
Semur, 60, 91-93, 95-99, 102-105, 114, 121, 122, 129, 
130, 132, 133, 135, 137-189, 141-146, 148, 156, 
157, 159, 160, 162, 164, 166-169, 171, 175-179, 
183, 184, 186-193, 195-198, 206, 208, 209, 211, 
O12, 2iG, 210. 
Senile Degeneration, 75. 
Senility in Orthoceratites, 34, 35. 
in Goniatitinee, 35. 
less marked in ancient forms, 35. 
in the individual described by D'Orbigny, 36. 
Separation, Geographical, 27. 
Sepioids, 18, 26, 48, 53. 
Septum, 9. 
Shaler, 46. 
Sheaths of the Siphon (Endocones), 12. 
Siebenburgen, 111, 159. 
Silesites, 24. 
Silphologie, 9 note. 
Siphon, structure of, 11, 15. 
collar of, 17. 
changes in, during growth, 34. 
funnels of, 13. 
position of, 51, 52. 
importance in ancient groups, Dl, oes 
Siphonal cecum, 9, 13, 14, 19. 
Solenhofen, 51. 
Somerset, 92, 144. 
Sorbonne, 137, 138. 
South America, 86, 87. 
Southeastern France, 102. 
South England, ©8. 
Southern Alps, 87. 
South German Basin, 87, 94, 96, 97, 99, 101, 114, 118, 
218. 
South Germany, 88-102, 104, 107, 108, 113, 114, 116, 
117, 121, 185,163, 
Sowerby, 68, 121, 158, 178, 188, 206, 219. 
Spain, 86, 108. 
Specialization, causes of, 52. 
Species, definition of, 56. 
Spezia, 116, 154, 166. 
Spitzbergen, 5 note, 86. 
Spheeroceras, 23, 32. 
Spheroceras refractum, 82, 47. 
Spinifera, 23, 24, 42. 
Spirula, 26, 52. 
Stages of Growth and Decline, 14. 
Stephani, 115. 
Steinheim, 29, 30. 
Steinmann, 86. 
Stellaris Bed, 105, 109. 
Stephanoceras bullatum, 32. 
coronatum, 23. 
Gervilli, 32. 
microstomum, 82. 
nodosum, 23. 
platystomum, 82. 
refractum, 32, 47. 
Stephanoceras, Genetic Relations of, 32. 
Stephanoceratide, 28. 
Stonehouse, 215. 
Street, 92. 
Striaries Bed, 105, 203. 
Struggle for Existence, 27, 38, 50, 53. 
St. Thibault, 1382, 185, 142, 144, 212, 213. 
Stur, 89, 109. 
Stuttgardt, 182, 156, 158, 176, 182. 
Suabia, 87, 89, 90, 118, 167, 180. 
Subclymenia, 25, 26, 80. 
Subnodosus, 188. 
Suess, 90, 93, 95, 96, 97, 100, 109, 115. 
Surroundings, action of, x, 52 note, 53. 
Sutures, origin of digitations of, 50. 
degeneration of, 57. : 
persistence in degeneration, 83. 
Sweden, 88, 115. 
Swedish Basin, 88. 
Swiss Alps, 114. 
Switzerland, 87, 90, 93, 114. 
Széklerland, 95, 110. 
Tenia, 45, 47. 
Taramelli, 115. 
Tate,.95, 117, 123. 
Temperate Homozoic Band, 87, 
Tentaculites, 10. 
Tertiary Radicals, 19, 22, 23, 107. 
Terqueum, 91, 94, 103, 117, 128. 
Teuchsloch, 203. 
Teutoberger Wald, 97, 98, 101. 
