134 GEOGRAPHICAL DISTRIBUTION. 



quenting the former ; for instance, the sea-otter/ 

 and the different kinds of seal 2 and morse, 3 the 

 turtle, 4 the penguin, 5 several insects, 6 and the 

 water-newts. 7 Other amphibious animals, if 

 they may be so called, are aquatic at one period 

 of their life, and terrestrial at another ; this is 

 particularly exemplified in some insects, thus the 

 grubs of water-beetles, 8 those of dragon-flies, 9 

 may-flies, 10 ephemeral-flies, 11 water-moths, 12 gnats 

 or mosquitos, 13 and several other two-winged flies, 

 live in the water, while the perfect insect is 

 either amphibious as the beetle, or terrestrial as 

 the remainder. 



But no part of this terraqueous globe is more 

 fully peopled, and with a greater variety and 

 diversity of beautiful, or strange, or monstrous 

 forms, than the waters, from the infinite ocean to 

 the most insignificant pool or puddle. Every part 

 and portion of the supposed element of water ; 

 nay, almost every drop of that fluid teems with 

 life. Thousands of aquatic species are known, 

 but myriads of myriads never have been seen 

 and never will be seen by the eye of man. 



1 Enhydra marina. 2 Phoca. 



3 Trichechus. 4 Chelonia Mydas. 



5 Aptenodytes. 6 Dyticus, Gyrinus, Ranatra, &c. 



7 Salamandrce aquaticce. 8 DyticidcE,lJydrophilid(Z, Gyrinidce. 



9 Libellulina. I0 Trichoptera. 



11 Ephemeridce. 12 Hydrocampa. 

 13 Culex. 



