58 INTRODUCTION. 



named work of M. Ferussac, and its author referred to 

 the contents of that work in anticipation of its actual 

 appearance. In it, jive onlj, out of the twenty-three 

 species are described, and all of them under names dif- 

 ferent from INIr. Say's, two of them being adopted from 

 M. Ferussac, and three altered arbitrarily from Mr. 

 Say's names, which M. Lamarck's own references proved 

 that he should have been acquainted with. In 1830, 

 M. Deshayes pubUshed a continuation of Bruguiere's 

 JSistoire Naturelle des Vers, in the Encyclojjedie Me- 

 thodique. Here, under the article HeHx, ten of the 

 same species are described. For three of them only, 

 Mr. Say's names are retained, (one of these being 

 ascribed to M. Ferussac, and another to M. Rafinesque,) 

 two appear imder names of M. Ferussac, two under 

 those of M. Lamarck, and one under that of M. Rafin- 

 esque ; one name is changed arbitrarily, and one is 

 given as a new species, under a new name. In 1838, in 

 the second edition of the Animaux sans Vertebres, 

 M. Deshayes noticed twelve of the same species, five of 

 which are under Mr. Say's names and ascribed to him, 

 three under those of M. Lamarck, three under those of 

 M. Ferussac, and one under that of M. Rafinesque. 

 The annexed table will exhibit, at one view, the species 

 described by ]Mr. Say, and the names applied to them 

 by the other authors referred to. 



