348 THE TRANSFORMATIONS OF THE ANIMAL WORLD 



Molluscs, Neumayr on, 137, 

 157-8 



North Atlantic, littoral 

 forms migrating from, 286 



Pliocene, 289-91 



Sacco on Tertiary forms, 145 



Sayn on, 161-2 



Sicilian Helices, 64 



Silurian and Cambrian, 326, 



327 



Tanganyika Lake forms, 27 3 



traces of youthful stage in, 

 257, 262 



variable rate of evolution in, 



162-6 



Monera, Haeckel on, 45, 46 

 Moneron stage of Haeckel, 54 

 Monocercal stage of Haeckel, 5 6 

 Monopleura, 216 

 Monorhinian stage of Haeckel, 



55 



Monospheridse, 222 

 Monotremata (Ornithorhyncus 



Echidna, etc), 31, 41, 52 

 Morosaurus, 300 

 Morotherium, 316 

 Mortonicerata, 286 

 Morula, 46, 47, 55 

 Mososaurus, 9 

 Multituberculata (Marsupials), 



304 



Murices, 159 



Mustelidce, 311, 313, 314 



Mutation ascending or de- 

 scending (proposed substi- 

 tute for term " species "), 191 



Mylodon, 316 



Myriapods (luli and Cloports 

 of Lamarck), 31, 49 



My tili, 194 



NAOSAURUS, 299 



Nassa (Piedmontese Mollusc), 



139. 159 



Nauplius (larval stage of Ar- 

 thropods), 49 



Nautilidae, 97, 159, 165 



coiled and straight shells, 

 228 



Nautilidae, Hyatt on, 240 



widely opened chambers, 94 

 Navicella, 228 



Nebalias, 327 

 Neo-Lamarckism, 79, 265 



Cope, the " head " of, 79 

 Neolobites, the, 221 

 NeomegalodontidcB, 161 

 Neoplagiaulax, 173 

 Nerineae, 159 



Neritince, 68 

 Neumayria, 141, 278 



flexuosa, 141 

 Noritce, 260 



Notidanus (Shark), 169 

 Notochord of the Primary 



fishes, 255 

 Notostylops, 308 

 Nucula, persistent form of 



Lamellibranchs, 163, 194, 



262 



CELUROPUS, 105, 151 



CEnothera Lamarckiana, ab- 

 normal varieties of, 275 



Okapi, discovery in African 

 equatorial forest, 8 



Oldhamia, 326 



Olenellus, 325 



Omosaurus, 301 



Ontogenic method, Haeckel' s 

 name for embryogenic 

 method, 44, 114 



Oppelice, 229 



Orbitolina concava (Forammi- 

 f era), 195 



conoidea, 195 



discoidea, 195 

 Oreopithecus, 154 



Organs, Braun and Brown on, 

 266 



Goethe on repetition and 

 metamorphosis, 24 



Lamarck on atrophy of, 25 



specialization of, 207 et seq. 

 Origin of Apes, 40, 84, 154 



of Batrachians, 84 



of Birds, Archceopteryx, 74, 



