I.--_Series of Non-articulated_ II.--_Series of Articulated_ _Animals_. _Animals_. " I |-- Infusoria. n | | s A | Polyps. e n | | n i | ---------------- s m | | | i a | Ascidians. Radiates. Worms. t l | | | i s | | -------------- v . | | | | e | | | Epizoa. " |-- | | | | | | " |-- | | | S A | Acephala. Annelids. Insects. e n | | | n i | | | s m | Molluscs. ------------- i a | | | t l | | Arachnids. i s | Crustacea. v . | | e | | " |-- Cirripedes. I n |-- t A | e n | Fishes. l i | Reptiles. l m | Birds. i a | Mammals. g l | e s |-- n . t It is interesting to note that Vertebrates are placed between the two series, and are now not linked on directly to any Invertebrate group. Lamarck's theory had little success. There is evidence, however, that both Meckel and Geoffroy owed a good many of their evolutionary ideas to Lamarck, and Cuvier paid him at least the compliment of criticising his theory,[345] not distinguishing it, however, very clearly from the evolutionary theories of the transcendentalists. But, speaking generally, Lamarck's theory of evolution exercised very little influence upon his contemporaries. This was probably due partly to the obscurity and confusion of his thought, partly to his lack of sympathy with the biological thought of his day, which was preponderatingly morphological. It was not that men's minds were not ripe for evolution, for in the early decades of the 19th century evolution was in the air. There were few of von Baer's contemporaries who had not read Lamarck;[346] Erasmus Darwin's _Zoonomia_ ran through three editions, and was translated into German, French and Italian;[247] German philosophy was full of the idea of evolution.