INDEX. 
Psiloceras Naumanni, 124. 
(Aigoc.) Naumanni, 124. 
pachydiscus, 123. 
planilaterale, 196. 
planorbe, 6, 22, 25, 37, 39, 41, 54-56, 58, 62, 65- 
67, 78, 80-82, 85, 90-98, 112, 118, 115, 117, 
121-124, 126, 136, 140, 142. 155, 156, 161, 
163, 164, 195-197, 215. 
planorboides, 89, 122. 
pleurolissum, 75, 122. 
pleuronotum, 123, 124. 
polycyclum, 122. 
polyphyllum, 123. 
Rahana, 89. 
sublaqueum, 123. 
sublaqueum, Wah., 126, 147. 
tenerum, Wih., 126. 
Psiloceratites, 6, 72, 85, 89, 90, 93, 136. 
Pteronautilus, 80. 
Pteropoda, 8, 10, 16. 
Ptychites, 5, 6. 
Ptychoceras, 29. 
Pulchellia, 23. 
Pyrenean Basin, 87. 
Quadragonal Whorl, 56, 77, 78. 
Quedlinburg, 92, 137, 138, 146. 
Quenstedtioceras, 23, 28, : 
Quenstedt, vii, 1, 29, 32, 33, 87, 55, 58, 62, 83, 90, 91, 
92, 93, 96, 98, 101, 105, 112, 118, 121, 123, 125, 
128, 129, 131, 135, 187, 138, 189, 141, 143, 149, 
155, 157, 158, 163, 167, 168, 169, 171, 177, 179, 
180, 181, 182, 183,184, 185, 186, 187, 190, 192, 
196, 197, 199, 200, 201, 209, 211, 216, 217, 218, 
219, 221, 
Radical Stock, 22, 24, 57, 85, 107, 112, 120. 
Radicals, Acmic, 23. 
Geratologous, 28. 
Mesozoic, 22. 
Primary, 3. 
Primitive, 3, 16. 
Retrogressive Forms, 28. 
Secondary, 3, 22, 71. 
Theory of, 21, 28. 
Transitional, 3. 
Raidwangen, 169. 
Ramert, 170. 
Raricostatus Bed, 103, 104, 106, 109, 146. 
Red Car, 96. 
Reineckia, 23. 
Replacement of characteristics, law of, 44; in anagene- 
sis, 74; in catagenesis, 78. 
Residual Basins, 89. 
Faunas, xi, 89, 106, 114, 116. 
Retrogressive Characters, genesis of, 74; tendency to 
inheritance of, 78. 
Retrogressive Forms, morphological equivalence in, 
28, 30. 
230 
Reynés, 102, 103, 153, 167, 176, 181, 185, 200. 
Rhabdoceras, 28, 30. 
Rhacophyllites, 122 note. 
Rhetic, 28, 90, 103, 111. 
Rhine, 113, 114. 
Rhone, 87, 88, 91, 96, 98-101, 103, 106, 108, 111, 112, 
188. . 
Rhone Basin, 92, 96, 97, 102, 104, 106, 108, 111, 114— 
1G; 213; 217. 
Rinteln, 137. 
Robin Hood’s Bay, 146, 170, 171, 201, 203. 
Rollier, 90. 
Romer, 92. 
Rostrum, 29, 49. 
Lotiformis Zone, 109, 134, 189. 
Rudern, 121. 
Ruffy, 122. 
Rugby, 155. 
Ruminantia, 27. 
Russia, 87. 
Russian Province, 86. 
Ryder, viii, 43. 
Salins, 90, 144, 157, 169, 184, 197, 201, 204, 214. 
Sageceras, 4. 
Sandberger, Guido, vii, 2, 14, 18. 
San Francisco, 87, 173. 
Sannionites, 13, 48. 
Sadne et Loire, 87, 88. 
Saulieu, 91, 121, 142. 
Scaphites, 31, 32, 47. 
Scaphites umbilicus, 34. 
ventricosus, 32. 
Scaphopoda, 10, 16. 
Schaichhof, 191, 192. 
Scheppenstadt, 191, 193. 
Schlonbach, 92, 98, 101, 102. 
Schloenbachia tricarinatus, 24. 
Westphalicus, 24. 
Schlotheimia, 5, 6, 7, 40, 44, 54, 58, 71, 73, 75, 80, 84, 
93, 106, 107, 118, 114, 115, 118, 128, 125-127, 
134, 185, 154, 157, 194, 201 note. 
Schlotheimia angulata, 93, 94, 126, 128, 129, 182, 134, 
196. : 
angulata, Wah., 180, 184. 
angulata, Zittel, 130. 
angulicostata, Gey., 155. 
angustisulcata, Gey., 135. 
Boucaultiana, 94. 
Boucaultiana, Wih., 21, 75, 183. 
catenata, 7, 25, 40, 57, 71, 78, 
div, 127,128, 13, 134/185; 
catenata, Wah., 25, 58, 129, 134. 
colubrata, 130. 
comptum, 134. 
Charmassei, 41, 94, 133, 134. 
Charmassei, D’Orb., 182. 
Charmassei, Wiih., 182. 
donar, 128, 134. 
75, 90, 94, 113, 
