NOTES ON EMBRYOLOGY AND CLASSIFICATION, 



Uf 



Class. 



Insecta 



III. MYRLiPODA 



■1 



1. Rhyncota 



2. Diptera 



3. Lepidoptera 



f 1. Chilognatha 



IV. Arachnida . <( 



Order. Hxamples. 



Grade b. SUGENTIA. 

 Aphis. 

 Cicada. 

 Nepa. 

 Cimex. 

 Musca. 

 \ Tipula. 

 Papilio. 

 Sphinx. 



[Julus. 



\Poli/zonium. 



\ Scolopendra. 



\_Scutigera, 

 Tracheopulmonata. 



[Scorpio. 



\_ Chelifer. 



[ Phryne. 



\_ Thelyplionus. 

 Galeodes. 



[ My gale. 



\Li/cosa. 



f Opilio. 



\ Gonyleptus. 



XHydrachna. 



\_Bemodex. 

 Branchiopulmonata. 

 Limulus. 



[Pterygotut. 



\Slimonia. 



J P/iacops. 



\nenus. 

 Appendix. Metarachnj:. 

 1. Linguatulina . Linguatula. 



3. Tardigrada . [t'^''T\ 



y Macrooiotus. 



3. Pycnogonida . \ ^{'"''^'''.f.'^: 



\_tnoxochilidium. 



2. Chilopoda 

 Branch a. 



1. Scorpioiudea 



2. Pedipalpa 



3. Galeodea 



4. Araneida 



5. Phalangida 



6. Acarina . 



Branch b. 



1. Xiphosura 



2. Eurypterina 



3. Trilobitina 



