APPENDIX A 151 



Series Arthropoda. 

 Class 1. Peripatoidea. Peripatus. 



- 2. Myriapoda. Centipedes, etc. 



- 3. Insecta. Insects. 



- 4. TriloUta. Trilobites. 



- 5. Arachnida. Spiders, Scorpions, Mites, etc. 



6. Crustacea. Crabs, Prawns, etc. 



Phylum MOLLUSCA. Triploblastic animals with vascular system 

 and reduced coelom. Body not metamerically segmented, 

 usually enclosed in a shell. Shell-fish. 



Phylum ECHINODERMATA. Triploblastic animals with rudi- 

 mentary vascular system and complicated coelom. Radial 

 symmetry has been imposed on an original bilateral sym- 

 metry. Star-fish, Sea-urchins, etc. 

 Phylum BRACHIOPODA. Triploblastic, coelomate, unsegmented 



animals, enclosed in a bivalve shell. Lingula, etc. 

 Phylum ENTEROPNEUSTA. Triploblastic, coelomate, partially 

 segmented animals, with proboscis and gill-slits. Instance 

 Balanoglossus. 



Phylum CHORDATA. Triploblastic, coelomate, metamerically 

 segmented animals, with dorsal tubular nervous system, and 

 gill-slits. 



Division Cephalochorda. Amphioxus. 

 Division Urochorda. Tunicates or Sea-squirts. 

 Division Vertebrata. 

 Class 1. Pisces. 

 - 2. Amphibia. 



3. Reptilia. 



4. Aves. 



5. Mammalia. 



Subclass 1. Monotremata or Prototheria. 



2. Marsupialia or Metatheria. 

 3. Placentalia or Eutheria. 



