542 ' CLASSIFICATION OF ANIMALS. 



13 Buccinum, whelk 17 Solen, razor-shell 



14 Ascidia .18 Cardium, coikle 



15 Thalia 19 Mytilus, muscle, 

 lfj Ostrea, oyster &c. &c. 



Cuvier classes the numerous genera of this order under the three 

 following divisions; 1st, cephalopoda, (from xs^aAij, the head, and 

 iT8s, the foot) which have the organs of motion placed round the 

 head : 2dly, gasterapoda, (from ycco-fyp, the beliv, and iroug) such as 

 crawl on the belly : and 3dly, acephela, (from a, privative, and 

 xsf aATj), which have no head. The three first genera belong to the 

 first division , the ten succeeding ones come under the secoud ; and 

 the remainder exemplify the last order. 



According as the shell of the testaceous mollusca consists of a sin, 

 gle convoluted tube; or of two, or more, separate pieces ; they are 

 called cochleae bivalves, multivalves, &c. 



Crustacea possess a hard external covering, and numerous articu- 

 lated members. A long nervous chord, beset with ganglia. Com- 

 pound eyes. Antennae and palpi like those of insects. A heart 

 and circulating vessels ; and gills. Teeth in the cavity of the sto- 

 mach. 



1 Cancer, crab, lobster, cray- 2 Monoculus 

 fish, shrimp 



Insects have articulated members and antennas. Those which fly 

 are subject to what is called a metamorphosis ; they pass through 

 certain intermediate states of existence, before they assume the last, 

 or perfect form. From the egg proceeds the larva, or caterpillar ; 

 this changes to the chrysalis, nympha, or aurelia ; from which the 

 perfect insect is produced. Nervous system consisting of a chord 

 beset with ganglia. No heart nor blood-vessels. Respiration car- 

 ried on by means of tracheae. 



Order I. Coleoptera ; having a hollow horny case, under which 

 the wings are folded. 



1 Scarabaeus, beetles 6 Lampyris, glow-worm 



2 Lucanus, stag-beetle 7 Meloe, Spanish.fly 



3 Dermestes 8 Staphylinus 



4 Coccinella, ladybird 9 Forsicula, ear- wig 



5 Curculia, weevil 



