APPENDIX II 547 



Subclass C. Gastropoda, Univalves 



Order a. Prosobranc/iia, Conches, Whelks, Cowries, etc. 

 Order b. Heteropoda 



Order c. Opisthobrajickia, Sea-slugs, etc. 

 Order d. Pidmonata, Snails, etc. 

 Subclass D. PTEROPODA, Pteropods i-t^-i^-*^ 7 

 Class 3. Cephalopoda ilu^^i •f^vt^ , ^a^i£££^ 



Order a. Tetrabranchiata 



Suborder a. Xairtiloidea, Xautilus, etc. 

 Suborder /3. *Ammonoidea, Ammonites 

 Order b. Dibranchiata 



Suborder a. Decapoda, Cuttle-fishes, etc. 

 Suborder /3. Octopoda, Octopus, etc 



IX. VERTEBRATA___. - - • - ^ ^- ^^&**^ 



Class 1. Cyclostomata. Lampreys 

 fk~~~~4- ^^TWitracodermata *"*] C ^T" *T' . v^Z<rv-»-^£. <^>/ 



Class 2. Pisces, Fishes 



Subclass A. Selachii, Sharks and 

 Subclass B. Holocephali. Chimaeroids or Spook-fishes' 

 Subclass C. Dipnoi, Lung-fishes 5^ dy^^-^ 



Order a. Sirenoidei, Existing Lung-fishes 3^*-^*£fc-» ' 

 Order b. ? * Arthrodira 

 Subclass D. Teleostomi 



Order a. Crossopterygii 

 Order b. Actinopterygii 



Suborder a. Chondrostei or Ganoids, Sturgeon, 



Gar-pike, etc. 

 Suborder #. Teleocephali or Teleosts, Herring, 

 Salmon, etc. 

 Class 3. Amphibia 

 Order a. * Stegocephala 



Order b. Gymnophiona , Snake-like Amphibians 

 Order c. Urodela* Mud-puppies, Salamanders 

 Order d. Anura, Frogs and Toads 

 Class 4. Reptilia. Reptiles 



md Rays IL^L^Gh, * ^^^^^ 



Order a. 



* Proganosaitria 



Order b. 



Rhyn chocephalia 



Order c. 



*Ichthyosauria 



Order d. 



* Plesiosauria 



Order e. 



Testudinata, Turtles and Tortoises 



Order / 



* Theromorpha 



Order g. 



Lepidosanria 



