102 DISTRIBUTION OF ANIMALS. [PART I. 
Ganoidei. 
Sub-class. Order. E £ Remarks. 
1. Acanthopterygii ...| 47 |Gasterosteide to Notacanthi. 
2, Do. a ee 5 |Pomacentride to Chromide. 
Teleostei 3. Acanthini 6 |Gadopside to Pleuronectide. 
Cleostel ---) 4, Physostomi ... ...| 29 |Siluride to Pegaside. 
5. Lophobranchii 2 |Solenostomide and Syngnathide. 
6. Plectognathi 2 |Sclerodermi and Gymnodontes. 
Dipnoi ..  @. Sirenoidei 1 |Sirenoidei. 
Caneites 8. Holostei 3 |Amiide to Lepidosteide. 
ere 9. Chondrostei. 2 |Accipenseride and Polydontide. 
Chondropte- | 10. Holocephala ... 1 |Chimeride. 
rygil 11. Plagiostomata 15 |Carchariide to Myliobatide. 
Cyclostomata 12. Marsipobranchii ...| 2 |Petromyzontide and Myxinide. 
Leptocardii 13, Cirrhostomi ... 1 |Cirrhostomi. 
Total ... 116 families. 
INSECTS. 
The families and genera of insects are so immensely numerous, 
probably exceeding fifty-fold those of all other land animals, 
that for this cause alone it would be impossible to enter fully 
into their distribution. It is also quite unnecessary, because 
many of the groups are so liable to be transported’ by accidental 
causes, that they afford no useful information for our subject ; 
while others are so obscure and uninteresting that they have 
been very partially collected and studied, and are for this 
reason equally ineligible. I have therefore selected a few of 
the largest and most conspicuous families, which have been so 
assiduously coliected in every part of the globe, and so carefully 
studied at home, as to afford valuable materials for com- 
parison with the vertebrate groups, when we have made due 
allowance for the dependence of many insects on peculiar forms 
of vegetation, and the facility with which many of them are 
transported either in the egg, larva, or perfect state, by winds, 
currents, and other less known means. 
I confine myself then, almost exclusively, to the sixteen 
families of Diurnal Lepidoptera or butterflies, and to six of the 
most extensive, conspicuous, and popular families of Coleoptera. 
