DEFINITION OF THE TERM INSECT. & 



a true circulation in his Mollusca and other white-blooded 

 animals. His Enaima, or animals that have blood, he 

 divides into Quadrupeds, Birds, Fishes, Cetacea, and 

 Apods or reptiles ; though he includes the latter, where 

 they have four legs, amongst the quadrupeds 3 ; and his 

 Anaima, or animals without blood, into Malachia, Ma- 

 lacostraca, Oslracoderma, and Entoma. The first of 

 these, the Malachia, he defines as animals that are ex- 

 ternally fleshy and internally solid, like the Enaima ; and 

 he gives the Sepia as the type of this class, which answers 

 to the Cephalopoda of the moderns. The next, the Ma- 

 lacostraca, synonymous with the Crustacea of Cuvier and 

 Lamarck, are those, he says, which have their solid part 

 without and the fleshy within, and whose shell will not 

 break, but splits, upon collision b . The Oslracoderma, cor- 

 responding with the Testacea of Linne, he also defines as 

 having their fleshy substance within, and the solid with- 

 out; but whose shell, as to its fracture, reverses the cha- 

 racter of the Malacostraca. He defines his last class 

 Entoma, in Latin Insecta, with which we are principally 

 concerned, as animals whose body is distinguished by in- 

 cisures, either on its upper or under side, or on both, and 

 has no solid or fleshy substance separate, but something 

 intermediate, their body being equally hard both within 

 and without . This definition would include the Anne- 

 lida and most other Vermes of Linne, except the Testacea, 

 which accordingly were considered as insects by those 

 Zoologists that intervened between Aristotle and the lat- 

 ter author. The Stagyrite, however, in another place, 



a Hist. Animal. 1. i. c.5,6: compare 1. v. c. 3 and 83, and Be 

 Partibus Animal. I. iv. c. 1 and 11. 



b To Is ok>.y)(>ov etvruv a Sgctwrov «XA« <p7\ctT0V. 

 c Hist. Animal. 1. iv. c. 1. 



B 2 



