280 



SUMMARY. 



Four hundred and sixty-one genera are des- 

 cribed in this text-book. These embrace every 

 known species of the Animal kingdom. Lecepede^ 

 Cuvier and others of the French School, have 

 subdivided most of these genera, until their list is 

 extended to thousands, including their subgenera, 

 In numerous cases they have merely given Greek 

 and Latin names to the Linnean sections of species. 

 The student should be told at the outset of his 

 course, that all the animals are embraced under 

 these 461 genera, which are included in the French 

 genera. 



The genera described in this text-book are af* 

 ranged according to the classes of Cuvier, as fol- 

 lows : Under Class 1, are 54 genera Class 2, 91 

 Class 3, 16 Class 4, 92 Class 5, 10 Class 

 6, 4 Class 7, 4 Class 8, 88 Class 9, 48 

 Class 10, 5 Class 11, 14 Class 12, 4 Class 

 13,. 16 Class 14, 15. Total 461. 



At the commencement of the present century ? 

 about 21,300 species had been described. I have set 

 down the number of species described at that 

 time under each genus, as nearly as it could 

 be ascertained. Though the number has been en- 

 creased several thousands since that time ; the 

 student may form an estimate of the relative ex- 

 tent of each genus, by that number. The genera 

 at that time stood thus, under the Linnean classes, 

 Class 1, 49 genera Class 2, 90 Class 3, 12 

 Class 4, 72 Class 5 ; 423 Class 6, 118, Total 



