INTRODUCTION. 



59 



TABLE OF TWENTY-THREE SPECIES OF HELIX, 



DESCRIBED BY THOMAS SAY, ANTERIOR TO, AND DURING THE EARLY 



PART OF THE YEAR 1821, 



SHOWING THE SYNONYMS SUBSEQUENTLY APPLIED TO THEM BY 

 EUROPEAN AUTHORS. 



It would be wrong to impute to either of the distm- 

 guished gentlemen who have been named, any inten- 

 tional injustice to Mr. Say. M. Ferussac indeed, as- 

 cribed to him all the species whose descriptions he had 

 seen, previous to the publication of his own work, and 

 those only, although it was in Ids power to have pro- 

 cured all of them. M. Lamarck had no definite no- 



